Date: Thu, 28 Jun 18 00:17:14 GMT Subject: physics daily 40 new + 15 crosses received by eprepget ------------------------------------------------------------------------------ ------------------------------------------------------------------------------ Send any comments regarding submissions directly to submitter. ------------------------------------------------------------------------------ Archives at http://arxiv.org/ To unsubscribe, e-mail To: physics@arXiv.org, Subject: cancel ------------------------------------------------------------------------------ received by eprepget from Tue 26 Jun 18 18:00:00 GMT to Wed 27 Jun 18 18:00:00 GMT ------------------------------------------------------------------------------ \\ arXiv:1806.10186 Date: Thu, 21 Jun 2018 07:19:52 GMT (2055kb,D) Title: A Zynq-based flexible ADC architecture combining real-time data streaming and transient recording Authors: Andrea Rigoni Garola, Gabriele Manduchi, Marco Gottado, Roberto Cavazzana, Mauro Recchia, Cesare Taliercio, Adriano Luchetta Categories: physics.ins-det \\ The RFX-mod2 Nuclear Fusion experiment is an upgrade of RFX-mod, shutdown in 2016. Among the other improvements in the machine structure and diagnostics, a larger number of electromagnetic probes (EMs) is foreseen to provide more information about plasma instabilities and to allow an improved real-time plasma control. An Analog to Digital Converter (ADC) architecture able to provide at the same time both transient recording and real-time streaming, as well as FPGA-based time integration of the inputs is foreseen in RFX-mod2. Transient recording provides full speed data acquisition (up to 1 MSample/s) by recording data in local memory and reading memory content after the plasma discharge. Real-time streaming of sub-sampled data is required for active control. The chosen technology is based on the XILINX Zynq architecture that provides in the same chip a multi-core ARM processor tightly coupled to a FPGA. Time critical functions are carried out by the FPGA, such as the management of the circular data buffer, low pass filtering for subsampling of the samples to be streamed and digital integration. Other functions are carried out by the processor, such as the management of the configuration setting, received via TCP/IP or HTTP, the data readout of acquired samples in transient recording buffers and network data streaming of data collected for active real-time plasma control. \\ ( https://arxiv.org/abs/1806.10186 , 2055kb) ------------------------------------------------------------------------------ \\ arXiv:1806.10190 Date: Tue, 19 Jun 2018 03:00:04 GMT (5794kb) Title: Diffraction effects in mechanically chopped laser pulses Authors: Samridhi Gambhir and Mandip Singh Categories: physics.ins-det physics.optics Journal-ref: Am. J. Phys. 86, 406, (2018) DOI: 10.1119/1.5029821 \\ A mechanical beam chopper consists of a rotating disc of regularly spaced wide slits which allow light to pass through them. A continuous light beam, after passing through the rotating disc, is switched-on and switched-off periodically, and a series of optical pulses are produced. The intensity of each pulse is expected to rise and fall smoothly with time. However, a careful study has revealed that the edges of mechanically chopped laser light pulses consist of periodic intensity undulations which can be detected with a photo detector. It has been shown in this paper that the intensity undulations in mechanically chopped laser pulses are produced by diffraction of light from the rotating disc and a detailed explanation of the intensity undulations is given. The experiment provides an efficient method to capture a one dimensional diffraction profile of light from a straight sharp-edge in the time domain. In addition, the experiment accurately measured wavelengths of three different laser beams from the undulations in mechanically chopped laser light pulses. \\ ( https://arxiv.org/abs/1806.10190 , 5794kb) ------------------------------------------------------------------------------ \\ arXiv:1806.10192 Date: Sat, 23 Jun 2018 12:08:36 GMT (425kb) Title: A low power DAQ system with high-speed storage for submersible buoy Authors: Zhilei Zhang, Peng Miao, Houbing Liu, Kun Hu, Feng Li, Ge Jin Categories: physics.ins-det eess.SP \\ Submersible Buoy (SB) is an important apparatus capable of long-term, fixed-point, continuous and multi-directional measurement of acoustic signals and hydrological environment monitoring in the harsh marine environment, providing important information for hydrological environment research, marine organism research and protection. We will describe a real-time data acquisition (DAQ) system with multiple designs to meet low-power consumption and high-speed data transmission. \\ ( https://arxiv.org/abs/1806.10192 , 425kb) ------------------------------------------------------------------------------ \\ arXiv:1806.10193 Date: Fri, 22 Jun 2018 05:43:56 GMT (2559kb) Title: Development of MicroTCA.4 based remote DAQ system for KSTAR Authors: Giil Kwon, Woong-ryol Lee, Taegu Lee, Kihyun Kim, Jaesic Hong Categories: physics.ins-det Comments: 4 pages, 11 figures, real time 2018 conference \\ To standardize and simplify the control system at Korea Superconducting Tokamak Advanced Research (KSTAR), we develop 10G Ethernet based remote DAQ system. By separating the DAQ system and the host, the structure of the control system can be made more flexible. We have developed a DAQ module with a 10G Ethernet interface based on a MicroTCA.4 system designed to control devices in real time on a remote server via 10GE. To connect proposed device and host, we use real time network based on UDP multicast atop 10GbE cut-through packet switching infrastructure. This system is implemented using Zynq based MicroTCA.4 board, matched RTM board that has analogue input/output interface and power supply system. By using remote DAQ system, multiple host server can subscribe the DAQ data without additional computational cost in real time. This system will be applied to control fueling system at KSTAR Tokamak. \\ ( https://arxiv.org/abs/1806.10193 , 2559kb) ------------------------------------------------------------------------------ \\ arXiv:1806.10194 Date: Thu, 21 Jun 2018 06:38:22 GMT (354kb) Title: Characteristic Study and Development of Surface Resistivity Measuring Device for Resistive Plate Chamber Detector Authors: A. Kumar, A. Pandey, N. Marimuthu, M. K. Singh, V. Singh, S. S. R. Inbanathan Categories: physics.ins-det Comments: 6 pages, 4 Figures, Presented in RPC 2018 and submitted for Publication in Journal of Instrumentation 2018 \\ The India-based Neutrino Observatory (INO) is an approved multi-institutional experiment of India. It will use maximum 30,000 Resistive Plate Chamber (RPC) of size 2x2m as an active detector in which each will be sandwiched between two iron plates. Each RPC detectors will be made up of 3mm thick glass (or Bakelite) plates whose one surface will be coated with graphite paint to work as electrode. To achieve effective and uniform electric field, the coated graphite paint must have uniform distribution over the glass surface. Uniformity can be demonstrated by measuring the surface resistance of the coated graphite paint. However, manual measurement of 60,000 electrodes with the help of multimeter and the jig demands huge amount of person-hour with compromised accuracy, and therefore that requires the need and importance of the automatic scanning system. An advanced automatic scanning system (ASS) has been designed & developed to fulfill the required needs and overcome the shortcomings of the initially developed system. Measurement are sensitive to the contact pressure between the jig and RPC electrode's surface. In this paper, various parameters of the ASS have been precisely fixed. Obtained results are compared with the standard one and found satisfactory within error. It has been observed that for obtaining the correct and safe value of surface resistance, applied pressure value in terms of force should be in the range of 9-11 Newton. \\ ( https://arxiv.org/abs/1806.10194 , 354kb) ------------------------------------------------------------------------------ \\ arXiv:1806.10202 Date: Tue, 26 Jun 2018 20:30:56 GMT (66kb,D) Title: Fully-resolved array of simulations investigating the influence of the magnetic Prandtl number Authors: Mairi E. McKay, Arjun Berera, Richard D. J. G. Ho Categories: physics.flu-dyn Comments: 6 pages, 6 figures \\ We explore the effect of the magnetic Prandtl number Pr_M on energy and dissipation in fully-resolved direct numerical simulations of steady-state, mechanically-forced homogeneous magnetohydrodynamic turbulence in the range Pr_M = 1/32 to 32. We compare the spectra and show that if the simulations are not fully resolved, the steepness of the scaling of the kinetic-to-magnetic dissipation ratio with Pr_M is overestimated. We also present results of decaying turbulence with helical and nonhelical magnetic fields, where we find nonhelical reverse spectral transfer for Pr_M < 1 for the first time. The results of this systematic analysis have applications ranging from tokamak reactors to black hole accretion disks. \\ ( https://arxiv.org/abs/1806.10202 , 66kb) ------------------------------------------------------------------------------ \\ arXiv:1806.10203 Date: Tue, 26 Jun 2018 20:33:40 GMT (258kb,D) Title: An integral transform technique for kinetic systems with collisions Authors: Jeffrey M. Heninger, Philip J. Morrison Categories: physics.plasm-ph \\ The linearized Vlasov-Poisson system can be exactly solved using the $G$-transform, an integral transform introduced in Refs. 1-3 that removes the electric field term, leaving a simple advection equation. We investigate how this integral transform interacts with the Fokker-Planck collision operator. The commutator of this collision operator with the $G$-transform (the "shielding term") is shown to be negligible. We exactly solve the advection-diffusion equation without the shielding term. This solution determines when collisions dominate and when advection (i.e. Landau damping) dominates. This integral transform can also be used to simplify gyro-/drift-kinetic equations. We present new gyrofluid equations formed by taking moments of the $G$-transformed equation. Since many gyro-/drift-kinetic codes use Hermite polynomials as basis elements, we include an explicit calculation of their $G$-transform. \\ ( https://arxiv.org/abs/1806.10203 , 258kb) ------------------------------------------------------------------------------ \\ arXiv:1806.10228 Date: Tue, 26 Jun 2018 22:05:48 GMT (303kb) Title: Clustering coefficients for correlation networks Authors: Naoki Masuda, Michiko Sakaki, Takahiro Ezaki, Takamitsu Watanabe Categories: physics.soc-ph q-bio.NC Comments: 5 figures, 2 tables; abstract is made shorter than in the journal version due to the length limit Journal-ref: Frontiers in Neuroinformatics, 12, 7 (2018) DOI: 10.3389/fninf.2018.00007 \\ The clustering coefficient quantifies the abundance of connected triangles in a network and is a major descriptive statistics of networks. For example, it finds an application in the assessment of small-worldness of brain networks, which is affected by attentional and cognitive conditions, age, psychiatric disorders and so forth. However, it remains unclear how the clustering coefficient should be measured in a correlation-based network, which is among major representations of brain networks. In the present article, we propose clustering coefficients tailored to correlation matrices. The key idea is to use three-way partial correlation or partial mutual information to measure the strength of the association between the two neighbouring nodes of a focal node relative to the amount of pseudo-correlation expected from indirect paths between the nodes. Our method avoids the difficulties of previous applications of clustering coefficient (and other) measures in defining correlational networks, i.e., thresholding on the correlation value, discarding of negative correlation values, the pseudo-correlation problem and full partial correlation matrices whose estimation is computationally difficult. For proof of concept, we apply the proposed clustering coefficient measures to functional magnetic resonance imaging data obtained from healthy participants of various ages and compare them with conventional clustering coefficients. We show that the clustering coefficients decline with the age. The proposed clustering coefficients are more strongly correlated with age than the conventional ones are. We also show that the local variants of the proposed clustering coefficients are useful in characterising individual nodes. In contrast, the conventional local clustering coefficients were strongly correlated with and therefore may be confounded by the node's connectivity. \\ ( https://arxiv.org/abs/1806.10228 , 303kb) ------------------------------------------------------------------------------ \\ arXiv:1806.10241 Date: Tue, 26 Jun 2018 23:10:14 GMT (7448kb,D) Title: Cascaded Lattice Boltzmann Method based on Central Moments for Axisymmetric Thermal Flows Including Swirling Effects Authors: Farzaneh Hajabdollahi, Kannan N. Premnath, Samuel W. J. Welch Categories: physics.flu-dyn cond-mat.stat-mech physics.comp-ph Comments: 49 pages,12 figures \\ A cascaded lattice Boltzmann (LB) approach based on central moments and multiple relaxation times to simulate thermal convective flows, which are driven by buoyancy forces and/or swirling effects, in the cylindrical coordinate system with axial symmetry is presented. In this regard, the dynamics of the axial and radial momentum components along with the pressure are represented by means of the 2D Navier-Stokes equations with geometric mass and momentum source terms in the pseudo Cartesian form, while the evolutions of the azimuthal momentum and the temperature field are each modeled by an advection-diffusion type equation with appropriate local source terms. Based on these, cascaded LB schemes involving three distribution functions are formulated to solve for the fluid motion in the meridian plane using a D2Q9 lattice, and to solve for the azimuthal momentum and the temperature field each using a D2Q5 lattice. The geometric mass and momentum source terms for the flow fields and the energy source term for the temperature field are included using a new symmetric operator splitting technique, via pre-collision and post-collision source steps around the cascaded collision step for each distribution function. These result in a particularly simple and compact formulation to directly represent the effect of various geometric source terms consistently in terms of changes in the appropriate zeroth and first order moments. Simulations of several complex buoyancy-driven thermal flows and including rotational effects in cylindrical geometries using the new axisymmetric cascaded LB schemes show good agreement with prior benchmark results for the structures of the velocity and thermal fields as well as the heat transfer rates given in terms of the Nusselt numbers. \\ ( https://arxiv.org/abs/1806.10241 , 7448kb) ------------------------------------------------------------------------------ \\ arXiv:1806.10247 Date: Tue, 26 Jun 2018 23:31:38 GMT (5827kb,D) Title: Symmetrized Operator Split Schemes for Force and Source Modeling in Cascaded Lattice Boltzmann Methods for Flow and Scalar Transport Authors: Farzaneh Hajabdollahi, Kannan N. Premnath Categories: physics.flu-dyn cond-mat.stat-mech physics.comp-ph Comments: 41 pages, 9 figures Journal-ref: Phys. Rev. E 97, 063303, 2018 DOI: 10.1103/PhysRevE.97.063303 \\ Operator split forcing schemes exploiting a symmetrization principle, i.e. Strang splitting, for cascaded lattice Boltzmann (LB) methods in two- and three-dimensions for fluid flows with impressed local forces are presented. Analogous scheme for the passive scalar transport represented by a convection-diffusion equation with a source term in a novel cascaded LB formulation is also derived. They are based on symmetric applications of the split solutions of the changes on the scalar field/fluid momentum due to the sources/forces over half time steps before and after the collision step. The latter step is effectively represented in terms of the post-collision change of moments at zeroth and first orders, respectively, to represent the effect of the sources on the scalar transport and forces on the fluid flow. Such symmetrized operator split cascaded LB schemes are consistent with the second-order Strang splitting and naturally avoid any discrete effects due to forces/sources by appropriately projecting their effects for higher order moments. All the force/source implementation steps are performed only in the moment space and they do not require formulations as extra terms and their additional transformations to the velocity space. These result in particularly simpler and efficient schemes to incorporate forces/sources in the cascaded LB methods unlike those considered previously. Numerical study for various benchmark problems in 2D and 3D for fluid flow problems with body forces and scalar transport with sources demonstrate the validity and accuracy, as well as the second-order convergence rate of the symmetrized operator split forcing/source schemes for the cascaded LB methods. \\ ( https://arxiv.org/abs/1806.10247 , 5827kb) ------------------------------------------------------------------------------ \\ arXiv:1806.10251 Date: Tue, 26 Jun 2018 23:53:37 GMT (13689kb,D) Title: Galilean Invariant Preconditioned Central Moment Lattice Boltzmann Method without Cubic Velocity Errors for Efficient Steady Flow Simulations Authors: Farzaneh Hajabdollahi, Kannan N. Premnath Categories: physics.flu-dyn physics.comp-ph Comments: 43 pages, 14 figures Journal-ref: Phys. Rev. E 97, 053303, 2018 DOI: 10.1103/PhysRevE.97.053303 \\ Lattice Boltzmann (LB) models used for the computation of fluid flows represented by the Navier-Stokes (NS) equations on standard lattices can lead to non-Galilean invariant (GI) viscous stress involving cubic velocity errors. This arises from the dependence of their third order diagonal moments on the first order moments for standard lattices, and strategies have recently been introduced to restore GI without such errors using a modified collision operator involving either corrections to the relaxation times or to the moment equilibria. Convergence acceleration in the simulation of steady flows can be achieved by solving the preconditioned NS equations, which contain a preconditioning parameter that alleviates the numerical stiffness. In the present study, we present a GI formulation of the preconditioned cascaded central moment LB method used to solve the preconditioned NS equations, which is free of cubic velocity errors on a standard lattice. A Chapman-Enskog analysis reveals the structure of the spurious non-GI defect terms and it is demonstrated that the anisotropy of the resulting viscous stress is dependent on the preconditioning parameter, in addition to the fluid velocity. It is shown that partial correction to eliminate the cubic velocity defects is achieved by scaling the cubic velocity terms in the off-diagonal third-order moment equilibria with the square of the preconditioning parameter. Furthermore, we develop additional corrections based on the extended moment equilibria involving gradient terms with coefficients dependent locally on the fluid velocity and the preconditioning parameter. Several conclusions are drawn from the analysis of the structure of the non-GI errors and the associated corrections, with particular emphasis on their dependence on the preconditioning parameter. Improvements in accuracy and convergence acceleration are demonstrated. \\ ( https://arxiv.org/abs/1806.10251 , 13689kb) ------------------------------------------------------------------------------ \\ arXiv:1806.10256 Date: Wed, 27 Jun 2018 00:29:17 GMT (18kb) Title: Relativistic-Amplitude electromagnetic waves - Beating the "magnetic" barrier Authors: Swadesh Mahajan and Manasvi Lingam Categories: physics.plasm-ph astro-ph.HE Comments: 6 pages; accepted for publication in Phys. Plasmas \\ The dispersion characteristics of an circularly polarized electromagnetic wave of arbitrary amplitude, propagating in a highly (thermally and kinematically) relativistic plasma, are shown to approach those of a linear wave in an unmagnetized, non-relativistic plasma. Further aided by high relativistic temperatures, the cut-off frequency tends to become negligibly small; as a result, waves with frequencies well below the nominal plasma and the cyclotron frequencies find the plasma to be essentially transparent. This relativistic phenomenon may greatly advance our ability to understand and model the dynamics of a large class of astrophysical and laser-produced high energy density systems. \\ ( https://arxiv.org/abs/1806.10256 , 18kb) ------------------------------------------------------------------------------ \\ arXiv:1806.10264 Date: Wed, 27 Jun 2018 01:46:13 GMT (7881kb,D) Title: Pilot-wave dynamics of two identical, in-phase bouncing droplet Authors: Rahil N. Valani and Anja C. Slim Categories: physics.flu-dyn nlin.CD Comments: 17 pages, 17 figures \\ A droplet bouncing on the surface of a vibrating liquid bath can move horizontally guided by the wave it produces on impacting the bath. The wave itself is modified by the environment, and thus the interactions of the moving droplet with the surroundings are mediated through the wave. This forms an example of a pilot-wave system. Taking the Oza Rosales Bush description for walking droplets as a theoretical pilot-wave model, we investigate the dynamics of two interacting identical, in-phase bouncing droplets theoretically and numerically. A remarkably rich range of behaviors is encountered as a function of the two system parameters, the ratio of inertia to drag, \k{appa}, and the ratio of wave forcing to drag, \b{eta}. The droplets typically travel together in a tightly bound pair, although they unbind when the wave forcing is large and inertia is small or inertia is moderately large and wave forcing is moderately small. Bound pairs can exhibit a range of trajectories depending on parameter values, including straight lines, sub-diffusive random walks, and closed loops. The droplets themselves may maintain their relative positions, oscillate towards and away from one another, or interchange positions regularly or chaotically as they travel. We explore these regimes and others and the bifurcations between them through analytic and numerical linear stability analyses and through fully nonlinear numerical simulation. \\ ( https://arxiv.org/abs/1806.10264 , 7881kb) ------------------------------------------------------------------------------ \\ arXiv:1806.10267 Date: Wed, 27 Jun 2018 01:59:06 GMT (3432kb,D) Title: Exploring non-adiabatic approximations to the exchange-correlation functional of TDDFT Authors: Johanna I. Fuks, Lionel Lacombe, Soeren E. B. Nielsen and Neepa T. Maitra Categories: physics.chem-ph Comments: 16 pages, 10 figures \\ A decomposition of the exact exchange-correlation potential of time-dependent density functional theory into an interaction component and a kinetic component offers a new starting point for non- adiabatic approximations. The components are expressed in terms of the exchange-correlation hole and the difference between the one-body density matrix of the interacting and Kohn-Sham systems, which must be approximated in terms of quantities accessible from the Kohn-Sham evolution. We explore several preliminary approximations, evaluate their fulfillment of known exact conditions, and test their performance on simple model systems for which available exact solutions indicate the significance of going beyond the adiabatic approximation. \\ ( https://arxiv.org/abs/1806.10267 , 3432kb) ------------------------------------------------------------------------------ \\ arXiv:1806.10281 Date: Wed, 27 Jun 2018 03:16:57 GMT (1913kb,D) Title: An Exploration of Spatial Radiomic Features in Pulmonary Sarcoidosis Authors: Sarah M. Ryan, Tasha Fingerlin, Nabeel Hamzeh, Lisa Maier, Nichole Carlson Categories: physics.med-ph \\ Sarcoidosis is a rare, multi-systemic, inflammatory disease, primarily affecting the lungs. High-resolution computed tomography (CT) scans are used to clinically characterize pulmonary sarcoidosis. In the medical imaging field, there is growing recognition to switch from visual examination of CT images to more rapid, objective assessments of the abnormalities. In this work, we explore the usefulness of various objective measures of spatial heterogeneity---fractal dimension, Moran's I, and Geary's C ---for distinguishing between abnormal sarcoidosis and normal lung parenchyma. CT data for N=58 sarcoidosis subjects enrolled at National Jewish Health were obtained from the GRADS study. CT data for N=101 control patients were obtained from the COPDGene study. Radiomic measures were computed for each two-dimensional slice of a given scan, in the axial, coronal, and sagittal planes. Functional regression was applied to identify lung regions where CT nodules tend to proliferate. Moran's I, Geary's C and fractal dimension significantly differentiate between subjects with and without sarcoidosis throughout the majority of the lung, with disease abnormalities most apparent in the top axial, middle coronal, and outer sagittal regions. A trend appeared across Scadding stages, with CT scans from patients with Scadding stages I and III appearing the healthiest, and Scadding stage IV appearing the least healthy. The radiomic measures and techniques presented herein successfully characterize CT images in sarcoidosis by objectively and efficiently approximating what we know about the pathology of sarcoidosis. \\ ( https://arxiv.org/abs/1806.10281 , 1913kb) ------------------------------------------------------------------------------ \\ arXiv:1806.10305 Date: Wed, 27 Jun 2018 05:39:46 GMT (958kb) Title: Au/Ag bimetallic nanocomposites as a highly sensitive plasmonic material Authors: Taerin Chung, Charles Soon Hong Hwang, Myeong-Su Ahn, and Ki-Hun Jeong Categories: physics.optics \\ We report Au/Ag bimetallic nanocomposites as a highly sensitive plasmonic material. A unit approach via a three-dimensional numerical modeling is introduced to observe collective plasmon resonance in Au/Ag bimetallic nanocomposites as well as Au mono-metallic nanoensembles. Au nanoensembles provide consistently identical plasmon wavelength, independent of inter-unit distance. In analogy with mono-metallic nanoensembles, Au/Ag bimetallic nanocomposites distinctly feature converging dual plasmon resonance peaks to a single plasmon resonance peak, strongly depending on the packing density and the unit size. An effective unit size of bimetallic nanocomposites is below 2.5 nm in a subwavelength structure, which is small enough to feature bimetallic nanocomposites. As a result, the Au/Ag bimetallic nanocomposites clearly show exceptionally high sensitivity and figure-ofmerit (approximately 3 fold of conventional plasmon sensitivity and 4.3 fold of conventional plasmon FOM), resulting from coupled Au-Ag quadrupole bimetallic nanounits. This study provides essential rationales for Au/Ag bimetallic nanocomposites serving as a desirable and alternative plasmonic material for advanced nanoplasmonic sensing technologies. \\ ( https://arxiv.org/abs/1806.10305 , 958kb) ------------------------------------------------------------------------------ \\ arXiv:1806.10346 Date: Wed, 27 Jun 2018 08:56:04 GMT (519kb,D) Title: Proposal for the formation of ultracold deeply-bound RbSr dipolar molecules by all-optical methods Authors: Adrien Devolder, Eliane Luc-Koenig, Osman Atabek, Mich\`ele Desouter-Lecomte and Olivier Dulieu Categories: physics.atom-ph Comments: 24 pages, 12 figures, 6 tables \\ Ultracold paramagnetic and polar diatomic molecules are among the promising systems for quantum simulation of lattice-spin models. Unfortunately, their experimental observation is still challenging. Based on our recent \textit{ab-initio} calculations, we analyze the feasibility of all-optical schemes for the formation of ultracold $^{87}$Rb$^{84}$Sr bosonic molecules. First, we have studied the formation by photoassociation followed by spontaneous emission. The photoassociation rates to levels belonging to electronic states converging to the $^{87}$Rb$(5s\,^2S)$+$^{84}$Sr($5s5p\,^3P_{0,1,2}$) asymptotes are particularly small close to the asymptote. The creation of molecules would be more interesting by using deeply levels that preferentially relaxes to the $v''=0$ level of the ground state. On the other hands, the photoassociation rates to levels belonging to electronic states converging to the Rb$(5p\,^2P_{1/2,3/2})$+Sr($5s^2\,^1S$) asymptotes have high value close to the asymptote. The relaxation from the levels close to the asymptotes creates weakly-bound molecules in mosty only one vibrational level. Second, stimulated Raman adiabatic passage (STIRAP) achieved in a tight optical trap efficiently creates weakly-bound ground-state molecules in a well-defined level, thus providing an alternative to magnetic Feshbach resonances to implement several schemes for an adiabatic population transfer toward the lowest ground-state level of RbSr. Finally, we have studied STIRAP process for transferring the weakly-bound molecules into the $v''=0$ level of the RbSr ground state. \\ ( https://arxiv.org/abs/1806.10346 , 519kb) ------------------------------------------------------------------------------ \\ arXiv:1806.10349 Date: Wed, 27 Jun 2018 08:59:11 GMT (5896kb,D) Title: Quantum-chemical insights from interpretable atomistic neural networks Authors: Kristof T. Sch\"utt, Michael Gastegger, Alexandre Tkatchenko, Klaus-Robert M\"uller Categories: physics.comp-ph cs.LG physics.chem-ph stat.ML \\ With the rise of deep neural networks for quantum chemistry applications, there is a pressing need for architectures that, beyond delivering accurate predictions of chemical properties, are readily interpretable by researchers. Here, we describe interpretation techniques for atomistic neural networks on the example of Behler-Parrinello networks as well as the end-to-end model SchNet. Both models obtain predictions of chemical properties by aggregating atom-wise contributions. These latent variables can serve as local explanations of a prediction and are obtained during training without additional cost. Due to their correspondence to well-known chemical concepts such as atomic energies and partial charges, these atom-wise explanations enable insights not only about the model but more importantly about the underlying quantum-chemical regularities. We generalize from atomistic explanations to 3d space, thus obtaining spatially resolved visualizations which further improve interpretability. Finally, we analyze learned embeddings of chemical elements that exhibit a partial ordering that resembles the order of the periodic table. As the examined neural networks show excellent agreement with chemical knowledge, the presented techniques open up new venues for data-driven research in chemistry, physics and materials science. \\ ( https://arxiv.org/abs/1806.10349 , 5896kb) ------------------------------------------------------------------------------ \\ arXiv:1806.10351 Date: Wed, 27 Jun 2018 09:02:34 GMT (1480kb) Title: Electronic structure and bond relaxation of 2-dimensional ring and chain of Ta metal on Na(110) surface and Na/Ta(110) interface Authors: Maolin Bo, Li Lei, Chuang Yao, Cheng Peng, Zhongkai Huang, Chang Q. Sun Categories: physics.comp-ph cond-mat.mtrl-sci \\ Using a combination of Bond band barrier and Zone selective electron spectroscopy correlation, we investigated the mechanism of Na-Ta and Ta-Na interface. We found that 7ML and 8ML Ta metal on Na(110) surface are formation of 2-dimensional chain and ring structure, respectively. \\ ( https://arxiv.org/abs/1806.10351 , 1480kb) ------------------------------------------------------------------------------ \\ arXiv:1806.10395 Date: Wed, 27 Jun 2018 10:32:49 GMT (2182kb,D) Title: Energy minimization of 2D incommensurate heterostructures Authors: Paul Cazeauz, Mitchell Luskin, Daniel Massatt Categories: physics.comp-ph cond-mat.mes-hall cond-mat.mtrl-sci Comments: 29 pages, 4 figures MSC-class: 74, 70 \\ We derive and analyze a novel approach for modeling and computing the mechanical relaxation of incommensurate 2D heterostructures. Our approach parametrizes the relaxation pattern by the compact local configuration space rather than real space, thus bypassing the need for the standard supercell approximation and giving a true aperiodic atomistic configuration. Our model extends the computationally accessible regime of weakly coupled bilayers with similar orientations or lattice spacing, for example materials with a small relative twist where the widely studied large-scale moire patterns arise. Our model also makes possible the simulation of multi-layers for which no interlayer empirical atomistic potential exists, such as those composed of MoS2 layers, and more generally makes possible the simulation of the relaxation of multi-layer heterostructures for which a planar moire pattern does not exist. \\ ( https://arxiv.org/abs/1806.10395 , 2182kb) ------------------------------------------------------------------------------ \\ arXiv:1806.10402 Date: Wed, 27 Jun 2018 10:43:16 GMT (808kb) Title: Contribution of the Hall effect to radial electric field and spontaneous/intrinsic rotation in tokamak core plasmas Authors: A.B. Kukushkin, M.G. Levashova (Kurchatov Institute) Categories: physics.plasm-ph Comments: 6 pages, 4 figures \\ The Hall effect, defined as the separation of electric charges of opposite sign when they move in a magnetic field, is suggested to contribute substantially to the observed negative radial electric field Er in the core plasma in tokamaks and, respectively, to the spontaneous/intrinsic rotation of plasma. A simple way to evaluate the Hall effect contribution to the Er value, using the independently measured space distributions of magnetic field and plasma rotation velocity, is suggested. The estimates of the effect for experimental data from the TM-4 and T-10 tokamaks suggest that the above phenomena in tokamaks should be described in the framework of the two-fluid magnetohydrodynamics. \\ ( https://arxiv.org/abs/1806.10402 , 808kb) ------------------------------------------------------------------------------ \\ arXiv:1806.10416 Date: Wed, 27 Jun 2018 11:31:57 GMT (2008kb) Title: Poor-man's model of hollow-core anti-resonant fibers Authors: Morten Bache, Md. Selim Habib, Christos Markos, Jesper L{\ae}gsgaard Categories: physics.optics Comments: In preparation \\ We investigate various methods for extending the simple analytical capillary model to describe the dispersion and loss of anti-resonant hollow-core fibers without the need of detailed finite-element simulations across the desired wavelength range. This poor-man's model can with a single fitting parameter quite accurately mimic dispersion and loss resonances and anti-resonances from full finite-element simulations. Due to the analytical basis of the model it is easy to explore variations in core size and cladding wall thickness, and should therefore provide a valuable tool for numerical simulations of the ultrafast nonlinear dynamics of gas-filled hollow-core fibers. \\ ( https://arxiv.org/abs/1806.10416 , 2008kb) ------------------------------------------------------------------------------ \\ arXiv:1806.10434 Date: Wed, 27 Jun 2018 12:22:19 GMT (5856kb,D) Title: Quantification of Model Uncertainty in RANS Simulations: A Review Authors: Heng Xiao and Paola Cinnella Categories: physics.flu-dyn physics.comp-ph Comments: submitted to Progress in Aerospace Sciences as an invited review article \\ In computational fluid dynamics simulations of industrial flows, models based on the Reynolds-averaged Navier--Stokes (RANS) equations are expected to play an important role in decades to come. However, model uncertainties are still a major obstacle for the predictive capability of RANS simulations. This review examines both the parametric and structural uncertainties in turbulence models. We review recent literature on data-free (uncertainty propagation) and data-driven (statistical inference) approaches for quantifying and reducing model uncertainties in RANS simulations. Moreover, the fundamentals of uncertainty propagation and Bayesian inference are introduced in the context of RANS model uncertainty quantification. Finally, literature on the uncertainties in large eddy simulations (LES) and direct numerical simulations (DNS) is briefly reviewed. \\ ( https://arxiv.org/abs/1806.10434 , 5856kb) ------------------------------------------------------------------------------ \\ arXiv:1806.10439 Date: Wed, 27 Jun 2018 12:27:42 GMT (1973kb) Title: Ballistic dispersive shock waves in optical fibers Authors: Javier Nu\~no (LICB), Christophe Finot (LICB), Guy Millot (LICB), Miro Erkintalo, Julien Fatome (LICB) Categories: physics.optics \\ We experimentally and numerically report on the formation of ballistic dispersive shock waves that mimic superfluid behavior in optical fibers. The shock wave is triggered by a strong nonlinear phase shift induced by a high power pump pulse on a cross-polarized continuous-wave probe field, and it exhibits a central void surrounded by two oscillating fronts moving away from each other with opposite velocities. The impact of disorder in the continuous-wave background as well as the difference of group-velocities between the two orthogonally polarized waves is also investigated. Our experimental observations are in very good agreement with theoretical and numerical predictions derived from the Manakov model. \\ ( https://arxiv.org/abs/1806.10439 , 1973kb) ------------------------------------------------------------------------------ \\ arXiv:1806.10455 Date: Fri, 22 Jun 2018 14:13:12 GMT (2266kb) Title: Natural Radioactivity Measurements Applied to the Dating and Authentication of Edible Meat Authors: Michael S. Pravikoff, Christine Marquet and Herv\'e Gu\'egan Categories: physics.pop-ph Comments: 7 pages, 6 figures, 1 picture \\ The measurement of the ratio of 228Th vs 228Ra, two isotopes from the natural radioactivity, is an ancient, but not entirely reliable, method of dating biological materials. It has been applied for the dating of fishes with mitigated results in many cases. It has been also experimented with mixed success in forensics cases where the question of how long a person whose bones were found was dead. Here too, the precision of the results is not satisfactory. Other applications concern age dating oil and gas waste waters spills. Our goal, while based on the same measurement of the ratio of the two radiosiotopes, is different. We aim at assessing the age of an animal at the date of its death, in particular for the animals intended for human consumption. The measurement technique relies on gamma spectrometry of the bones of 228Th and 228Ra stemming from ingested food and from the environment. A strong incentive to our research is fraudulent sales of meat with falsified identification. For instance, mutton sold as lamb, which is more expensive. Depending on the country of origin, this is complicated by varying legal definitions of the animal category, which renders controls for imported meat difficult. Preliminary measurements with retail samples of approximate identification validate the procedure. Further and more precise inquiries in a collaborative work with the French Ministry's Anti-Fraud Agency (equivalent of the U.S. Food and Drug Administration) are on their way. \\ ( https://arxiv.org/abs/1806.10455 , 2266kb) ------------------------------------------------------------------------------ \\ arXiv:1806.10456 Date: Wed, 27 Jun 2018 13:09:50 GMT (1490kb,D) Title: Real-time Data Acquisition and Processing System for MHz Repetition Rate Image Sensors Authors: Aleksander Mielczarek (1), Dariusz Makowski (1), Andrzej Napieralski (1), Christopher Gerth (2), Bernd Steffen (2) ((1) Lodz University of Technology, (2) Deutsches Elektronen-Synchrotron) Categories: physics.ins-det Comments: 2 pages, 4 figures, short form for Real-Time 2018 Conference \\ One of the optimization goals of a particle accelerator is to reach the highest possible beam peak current. For that to happen the electron bunch propagating through the accelerator should be kept relatively short along the direction of its travel. In order to obtain a better understanding of the beam composition it is crucial to evaluate the electric charge distribution along the micrometer-scale packets. The task of the Electro-Optic Detector (EOD) is to imprint the beam charge profile on the spectrum of light of a laser pulse. The actual measurement of charge distribution is then extracted with a spectrometer based on a diffraction grating. The article focuses on developed data acquisition and processing system called the High-speed Optical Line Detector (HOLD). It is a 1D image acquisition system which solves several challenges related to capturing, buffering, processing and transmitting large data streams with use of the FPGA device. It implements a latency-optimized custom architecture based on the AXI interfaces. The HOLD device is realized as an FPGA Mezzanine Card (FMC) carrier with single High Pin-Count connector hosting the KIT KALYPSO detector. The solution presented in the paper is probably one of the world fastest line cameras. Thanks to its custom architecture it is capable of capturing at least 10 times more frames per second than fastest comparable commercially available devices. \\ ( https://arxiv.org/abs/1806.10456 , 1490kb) ------------------------------------------------------------------------------ \\ arXiv:1806.10490 Date: Wed, 27 Jun 2018 13:58:02 GMT (1332kb,AD) Title: Statistical mechanics of an elastically pinned membrane: Equilibrium dynamics and power spectrum Authors: Josip Augustin Jane\v{s}, Daniel Schmidt, Udo Seifert and Ana-Sun\v{c}ana Smith Categories: physics.bio-ph cond-mat.soft \\ In biological settings membranes typically interact locally with other membranes or the extracellular matrix in the exterior, as well as with internal cellular structures such as the cytoskeleton. Characterization of the dynamic properties of such interactions presents a difficult task. Significant progress has been achieved through simulations and experiments, yet analytical progress in modelling pinned membranes has been impeded by the complexity of governing equations. Here we circumvent these difficulties by calculating analytically the time-dependent Green's function of the operator governing the dynamics of an elastically pinned membrane in a hydrodynamic surrounding and subject to external forces. This enables us to calculate the equilibrium power spectral density for an overdamped membrane pinned by an elastic, permanently-attached spring subject to thermal excitations. By considering the effects of the finite experimental resolution on the measured spectra, we show that the elasticity of the pinning can be extracted from the experimentally measured spectrum. Membrane fluctuations can thus be used as a tool to probe mechanical properties of the underlying structures. Such a tool may be particularly relevant in the context of cell mechanics, where the elasticity of the membrane's attachment to the cytoskeleton could be measured. \\ ( https://arxiv.org/abs/1806.10490 , 1332kb) ------------------------------------------------------------------------------ \\ arXiv:1806.10494 Date: Wed, 27 Jun 2018 14:16:45 GMT (806kb) Title: Zonal-mean atmospheric dynamics of slowly-rotating terrestrial planets Authors: G. J. Colyer and G. K. Vallis Categories: physics.ao-ph Comments: 25 pages, 10 figures \\ The zonal-mean atmospheric flow of an idealized terrestrial planet is analyzed using both numerical simulations and zonally symmetric theories, focusing largely on the limit of low planetary rotation rate. Two versions of a zonally symmetric theory are considered, the standard Held-Hou model, which features a discontinuous zonal wind at the edge of the Hadley cell, and a variant with continuous zonal wind but discontinuous temperature. The two models have different scalings for the boundary latitude and zonal wind. Numerical simulations are found to have smoother temperature profiles than either model, with no temperature or velocity discontinuities even in zonally symmetric simulations. Continuity is achieved because of the presence of an overturning circulation poleward of the point of maximum zonal wind, which allows the zonal velocity profile to be smoother than the original theory without the temperature discontinuities of the variant theory. Zonally symmetric simulations generally fall between the two sets of theoretical scalings, and have a faster polar zonal flow than either. Three-dimensional simulations that allow for eddy motion fall closer to the scalings of the variant model. At very low rotation rates the maximum zonal wind falls with falling planetary rotation rate, even in the three-dimensional simulations, and collapses completely at zero rotation. Nevertheless, the low-rotation limit of the overturning circulation is strong enough to drive the temperature profile close to a state of nearly constant potential temperature. \\ ( https://arxiv.org/abs/1806.10494 , 806kb) ------------------------------------------------------------------------------ \\ arXiv:1806.10497 Date: Wed, 27 Jun 2018 14:25:44 GMT (2280kb) Title: Vorticity dynamics of revolving wings: The role of planetary vortex tilting on the stability of the leading-edge vortex Authors: Nathaniel H. Werner, Hojae Chung, Junshi Wang, Geng Liu, John Cimbala, Haibo Dong, Bo Cheng Categories: physics.flu-dyn physics.bio-ph Comments: 23 pages, 10 figures, 3 tables, 4 supplementary figures \\ This work investigated the vorticity dynamics and stability of leading-edge vortices (LEVs) in revolving wings. Previous studies suggested that Coriolis acceleration and spanwise flow both played key roles in stabilizing the LEV; however, the exact mechanism remains unclear. The current study examined a mechanism that relates the effects of Coriolis acceleration, spanwise flow, and the tilting of the planetary vortex on limiting the growth of the LEV. Specifically, this mechanism states that a vertical gradient in spanwise flow can create a vertical gradient in Coriolis acceleration, which will in turn produce oppositely-signed vorticity within the LEV. This gradient of Coriolis acceleration corresponds to the spanwise (radial) component of planetary vortex tilting (PVTr) that reorients the planetary vortex into the spanwise direction therefore creating oppositely-signed LEV vorticity. Using an in-house, immersed-boundary-method flow solver, this mechanism was investigated alongside the other vorticity dynamics for revolving wings of varying aspect ratio (AR=3, 5, and 7) and Reynolds number (Re=110, and 1400). Analyses of vorticity dynamics showed that the PVTr consistently produced oppositely-signed vorticity for all values of AR and Re investigated, although other three-dimensional phenomena play a similar but more dominant role when Re = 1400. In addition, the relative strength of the PVTr increased with increasing AR due to a decrease in the magnitude of advection. Finally, the effects of AR and Re on the vorticity dynamics and LEV stability were also investigated. \\ ( https://arxiv.org/abs/1806.10497 , 2280kb) ------------------------------------------------------------------------------ \\ arXiv:1806.10504 Date: Wed, 27 Jun 2018 14:41:16 GMT (3368kb,D) Title: Compact ultracold electron source based on a grating magneto optical trap Authors: J.G.H. Franssen, M.A.W. van Ninhuijs, O.J. Luiten Categories: physics.acc-ph physics.atom-ph \\ A compact ultracold electron source based on a grating magneto optical trap (MOT) was designed, commissioned and tested. The design is compact since it requires one trapping laser beam that passes through a transparent accelerator module. The MOT parameters have been extensively characterized. We have used the ultracold atoms to measure the electric field in the acceleration gap which agrees well with simula- tions. Finally we show the first electron beam created from a grating MOT. The electron beam energy was determined using a electron time-of-flight measurement. Additionally we show that the normalized transverse beam emittance is comparable to emittances measured in conventional ultracold electron sources. \\ ( https://arxiv.org/abs/1806.10504 , 3368kb) ------------------------------------------------------------------------------ \\ arXiv:1806.10529 Date: Wed, 27 Jun 2018 15:29:02 GMT (504kb) Title: Cloud droplets growth due to supersaturation fluctuations in stratiform clouds Authors: Xiang-Yu Li, Gunilla Svensson, Axel Brandenburg, and Nils E. L. Haugen Categories: physics.ao-ph Report-no: NORDITA 2018-049 \\ Condensational growth of cloud droplets due to supersaturation fluctuations is investigated by solving the hydrodynamic and thermodynamic equations using direct numerical simulations with droplets being modeled as Lagrangian particles. We find that the width of droplet size distributions increases with time, which is contrary to the classical theory without supersaturation fluctuations, where condensational growth leads to progressively narrower size distributions. Nevertheless, in agreement with earlier Lagrangian stochastic models of the condensational growth, the standard deviation of the surface area of droplets increases as t^(1/2) . Also, we numerically confirm that the time evolution of the size distribution depends strongly on the Reynolds number and only weakly on the mean energy dissipation rate. This is shown to be due to the fact that temperature fluctuations and water vapor mixing ratio fluctuations increases with increasing Reynolds number, therefore the resulting supersaturation fluctuations are enhanced with increasing Reynolds number. Our simulations may explain the broadening of the size distribution in stratiform clouds qualitatively, where the updraft velocity is almost zero. \\ ( https://arxiv.org/abs/1806.10529 , 504kb) ------------------------------------------------------------------------------ \\ arXiv:1806.10538 Date: Mon, 18 Jun 2018 10:55:35 GMT (166kb,D) Title: Theory of the Drift-Wave Instability at Arbitrary Collisionality Authors: R. Jorge, P. Ricci, N. F. Loureiro Categories: physics.plasm-ph Comments: 6 pages, 3 figures, submitted for publication \\ We introduce a framework, based on the expansion of the distribution function on a Hermite-Laguerre polynomial basis, to study the effects of collisions on magnetized plasma instabilities at arbitrary mean-free path. Focusing on the drift-wave instability, we show that our framework allows retrieving established collisional and collisionless limits. At the intermediate collisionalities relevant for present and future magnetic nuclear fusion devices, deviations with respect to collision operators used in state-of-the-art turbulence simulation codes show the need for retaining the full Coulomb operator in order to obtain both the correct instability growth rate and eigenmode spectrum, with potentially important implications to the understanding of plasma turbulence. The exponential convergence of the spectral representation that we propose makes the representation of the velocity space dependence, including the full collision operator, optimally efficient. \\ ( https://arxiv.org/abs/1806.10538 , 166kb) ------------------------------------------------------------------------------ \\ arXiv:1806.10548 Date: Wed, 27 Jun 2018 16:09:17 GMT (355kb) Title: Hamiltonian distributed chaos in the north-south dipole and quadrupole teleconnections Authors: A. Bershadskii Categories: physics.ao-ph \\ It is shown that the north-south teleconnections in the northern hemisphere: North Atlantic (NAO), East Pacific (EPO), Western Pacific (WPO) dipole oscillations and Pacific/North American quadrupole pattern (PNA), are dominated by the Hamiltonian distributed chaos on the daily to intraseasonal time scales. Differences of the chaotic properties of the dipole and quadrupole oscillations as well as their relation to the surface air temperature have been briefly discussed. A chaotic spectral affinity of the PNA quadrupole pattern to the Arctic Oscillation and the Greenland blocking phenomenon have been considered in this context. \\ ( https://arxiv.org/abs/1806.10548 , 355kb) ------------------------------------------------------------------------------ \\ arXiv:1806.10550 Date: Wed, 27 Jun 2018 16:10:43 GMT (10109kb,AD) Title: Computing dynamics of thin films via large scale GPU-based simulations Authors: Michael-Angelo Y.-H. Lam and Linda J. Cummings and Lou Kondic Categories: physics.flu-dyn physics.comp-ph Comments: 38 pages, 25 figures \\ We present the results of large scale simulations of 4th order nonlinear partial differential equations of dif- fusion type that are typically encountered when modeling dynamics of thin fluid films on substrates. The simulations are based on the alternate direction implicit (ADI) method, with the main part of the compu- tational work carried out in the GPU computing environment. Efficient and accurate computations allow for simulations on large computational domains in three spatial dimensions (3D) and for long computational times. We apply the methods developed to the particular problem of instabilities of thin fluid films of nanoscale thickness. The large scale of the simulations minimizes the effects of boundaries, and also allows for simulating domains of the size encountered in published experiments. As an outcome, we can analyze the development of instabilities with an unprecedented level of detail. A particular focus is on analyzing the manner in which instability develops, in particular regarding differences between spinodal and nucleation types of dewetting for linearly unstable films, as well as instabilities of metastable films. Simulations in 3D allow for consideration of some recent results that were previously obtained in the 2D geometry (J. Fluid Mech. 841, 925 (2018)). Some of the new results include using Fourier transforms as well as topological invariants (Betti numbers) to distinguish the outcomes of spinodal and nucleation types of instabilities, describing in precise terms the complex processes that lead to the formation of satellite drops, as well as distinguishing the shape of the evolving film front in linearly unstable and metastable regimes. We also discuss direct comparison between simulations and available experimental results for nematic liquid crystal and polymer films. \\ ( https://arxiv.org/abs/1806.10550 , 10109kb) ------------------------------------------------------------------------------ \\ arXiv:1806.10585 Date: Wed, 27 Jun 2018 17:33:43 GMT (1037kb) Title: Micromachined force scale for optical power measurement by radiation pressure sensing Authors: Ivan Ryger, Alexandra B. Artusio-Glimpse, Paul Williams, Nathan Tomlin, Michelle Stephens, Kyle Rogers, Matthew Spidell, and John Lehman Categories: physics.ins-det \\ We introduce a micromachined force scale for laser power measurement by means of radiation pressure sensing. With this technique, the measured laser light is not absorbed and can be utilized while being measured. We employ silicon micromachining technology to construct a miniature force scale, opening the potential to its use for fast in-line laser process monitoring. Here we describe the mechanical sensing principle and conversion to an electrical signal. We further outline an electrostatic force substitution process for nulling of the radiation pressure force on the sensor mirror. Finally, we look at the performance of a proof-of-concept device in open-loop operation (without the nulling electrostatic force) subjected to a modulated laser at 250 W and find its response time is less than 20 ms with noise floor dominated by electronics at 2.5 W/root(Hz). \\ ( https://arxiv.org/abs/1806.10585 , 1037kb) ------------------------------------------------------------------------------ \\ arXiv:1806.10589 Date: Wed, 27 Jun 2018 17:39:15 GMT (905kb,D) Title: An Adaptive Volumetric Flux Boundary Condition for Lattice Boltzmann Methods Authors: James E. McClure, Zhe Li, Adrian P. Sheppard, Cass T. Miller Categories: physics.comp-ph \\ This paper presents a spatially and temporally adaptive boundary condition to specify the volumetric flux for lattice Boltzmann methods. The approach differs from standard velocity boundary conditions because it allows the velocity to vary over the boundary region provided that the total flux through the boundary satisfies a prescribed constraint, which is a typical scenario for laboratory experimental studies. This condition allows the boundary pressure to adjust dynamically to yield a specified boundary flow rate as a means to avoid unphysical mismatch between the boundary velocity and the interior flow field that can arise when a constant velocity boundary condition is applied. The method is validated for simulation of one- and two-fluid flow in complex materials, with conditions determined to match typical experiments used to study flow in porous media. \\ ( https://arxiv.org/abs/1806.10589 , 905kb) ------------------------------------------------------------------------------ \\ arXiv:1806.10595 Date: Wed, 27 Jun 2018 17:58:30 GMT (4804kb,D) Title: Thermal Marangoni-driven Dynamics of Spinning Liquid Films Authors: Joshua A. Dijksman, Shomeek Mukhopadhyay, Robert P. Behringer, Thomas P. Witelski Categories: physics.flu-dyn Comments: 13 pages, 10 figures \\ Spin coating of thin films of viscous liquids on a rotating substrate is a core technological component of semiconductor microchip fabrication. The thinning dynamics is influenced by many physical processes. Specifically temperature gradients affect thin liquid films through their influence on the local fluid surface tension. We show here experimentally and numerically that adding a static temperature gradient has a significant effect on the equilibrium film thickness and height profile reached in spin coating. Our results suggest that thermal gradients can be used to control film height profile dynamics. \\ ( https://arxiv.org/abs/1806.10595 , 4804kb) ------------------------------------------------------------------------------ \\ arXiv:1806.10597 Date: Wed, 20 Jun 2018 14:51:47 GMT (1689kb,D) Title: Data clustering based on Langevin annealing with a self-consistent potential Authors: Kyle Lafata, Zhennan Zhou, Jian-Guo Liu and Fang-Fang Yin Categories: physics.comp-ph math.DS \\ This paper introduces a novel data clustering algorithm based on Langevin dynamics, where the associated potential is constructed directly from the data. To introduce a self-consistent potential, we adopt the potential model from the established Quantum Clustering method. The first step is to use a radial basis function to construct a density distribution from the data. A potential function is then constructed such that this density distribution is the ground state solution to the time-independent Schrodinger equation. The second step is to use this potential function with the Langevin dynamics at sub-critical temperature to avoid ergodicity. The Langevin equations take a classical Gibbs distribution as the invariant measure, where the peaks of the distribution coincide with minima of the potential surface. The time dynamics of individual data points lead to different metastable states, which are interpreted as cluster centers. Clustering is therefore achieved when subsets of the data aggregate - as a result of the Langevin dynamics for a moderate period of time - in the neighborhood of a particular potential minimum. While the data points are pushed towards potential minima by the potential gradient, Brownian motion allows them to effectively tunnel through local potential barriers and escape saddle points into locations of the potential surface otherwise forbidden. The algorithm's feasibility is first established based on several illustrating examples and theoretical analyses, followed by a stricter evaluation using a standard benchmark dataset. \\ ( https://arxiv.org/abs/1806.10597 , 1689kb) ------------------------------------------------------------------------------ \\ arXiv:1806.10598 Date: Sat, 16 Jun 2018 08:40:46 GMT (1813kb,D) Title: Scale Prevention By Ceramic Balls Authors: Hideo Kawarada and Olivier Pironneau Categories: physics.comp-ph math.NA Comments: 27 pages \\ In industrial facilities and household equipments scale formation leads to reduced efficiency and damages. Therefore various devices for anti-scale have been designed for a long time. Recently one of them, an aggregation of ceramic spheres, was proposed to prevent scale formation and its efficiency shown experimentally. The purpose of this paper is to clarify the function of this device by proposing several mathematical models and by pursuing their mathematical and numerical analysis. The first model measures the effect on nucleation of calcite of the electric potential near the surface of a ceramic sphere in natural water. The second model is based on a crystal lattice model and argues that the surface tension energy of the calcite particles is reduced by the polarization energy brought by the ceramic balls. The third model is macroscopic and numerical and studies the effect of two ceramic balls arrangements in a flow of water containing calcite particles. \\ ( https://arxiv.org/abs/1806.10598 , 1813kb) ------------------------------------------------------------------------------ \\ arXiv:1806.10599 Date: Fri, 22 Jun 2018 22:34:37 GMT (2159kb,D) Title: On the accuracy of spectral solvers for micromechanics based fatigue modeling Authors: Sergio Lucarini, Javier Segurado Categories: physics.comp-ph cond-mat.mtrl-sci Comments: Preprint accepted for publication in Computational Mechanics \\ A framework based on FFT is proposed for micromechanical fatigue modeling of polycrystals as alternative to the Finite Element method (FEM). The variational FFT approach is used with a crystal plasticity model for the cyclic behavior of the grains introduced through a FEM material subroutine, in particular an Abaqus umat. The framework also includes an alternative projection operator based on discrete differentiation to improve the microfield fidelity allowing to include second phases. The accuracy and efficiency of the FFT framework for microstructure sensitive fatigue prediction are assessed by comparing with FEM. The macroscopic cyclic response of a polycrystal obtained with both methods were indistinguishable, irrespective of the number of cycles. The microscopic fields presented small differences that decrease when using the discrete projection operator, which indeed allowed simulating accurately microstructures containing very stiff particles. Finally, the maximum differences in the fatigue life estimation from the microfields respect FEM were around 15% . In summary, this framework allows predicting fatigue life with a similar accuracy than using FEM but strongly reducing the computational cost. \\ ( https://arxiv.org/abs/1806.10599 , 2159kb) %-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%- ------------------------------------------------------------------------------ \\ arXiv:1806.09921 (*cross-listing*) Date: Tue, 26 Jun 2018 11:39:08 GMT (86kb,D) Title: Rotational Alignment Decay and Decoherence of Molecular Superrotors Authors: Benjamin A. Stickler, Farhad T. Ghahramani, Klaus Hornberger Categories: quant-ph physics.chem-ph \\ We present the quantum master equation describing the coherent and incoherent dynamics of a rapidly rotating molecule in presence of a thermal background gas. The master equation relates the rate of rotational alignment decay and decoherence to the microscopic scattering amplitudes, which we calculate for anisotropic van der Waals scattering. For large rotational energies, we find excellent agreement of the resulting alignment decay rate with recent superrotor experiments. \\ ( https://arxiv.org/abs/1806.09921 , 86kb) ------------------------------------------------------------------------------ \\ arXiv:1806.10169 (*cross-listing*) Date: Tue, 26 Jun 2018 18:53:45 GMT (1968kb,D) Title: Probing quantum thermalization of a disordered dipolar spin ensemble with discrete time-crystalline order Authors: Joonhee Choi, Hengyun Zhou, Soonwon Choi, Renate Landig, Wen Wei Ho, Junichi Isoya, Fedor Jelezko, Shinobu Onoda, Hitoshi Sumiya, Dmitry A. Abanin, and Mikhail D. Lukin Categories: quant-ph cond-mat.dis-nn cond-mat.mes-hall cond-mat.stat-mech physics.atom-ph Comments: 6 + 14 pages, 4 + 8 figures \\ We investigate thermalization dynamics of a driven dipolar many-body quantum system through the stability of discrete time crystalline order. Using periodic driving of electronic spin impurities in diamond, we realize different types of interactions between spins and demonstrate experimentally that the interplay of disorder, driving and interactions leads to several qualitatively distinct regimes of thermalization. For short driving periods, the observed dynamics are well described by an effective Hamiltonian which sensitively depends on interaction details. For long driving periods, the system becomes susceptible to energy exchange with the driving field and eventually enters a universal thermalizing regime, where the dynamics can be described by interaction-induced dephasing of individual spins. Our analysis reveals important differences between thermalization of long-range Ising and other dipolar spin models. \\ ( https://arxiv.org/abs/1806.10169 , 1968kb) ------------------------------------------------------------------------------ \\ arXiv:1806.10279 (*cross-listing*) Date: Wed, 27 Jun 2018 03:05:10 GMT (1183kb,D) Title: Conclusive experimental demonstration of one-way Einstein-Podolsky-Rosen steering Authors: Nora Tischler, Farzad Ghafari, Travis J. Baker, Sergei Slussarenko, Raj B. Patel, Morgan M. Weston, Sabine Wollmann, Lynden K. Shalm, Varun B. Verma, Sae Woo Nam, Howard M. Wiseman, Geoff J. Pryde Categories: quant-ph physics.optics Comments: Supplemental information included in the document \\ Einstein-Podolsky-Rosen steering is a quantum phenomenon wherein one party influences, or steers, the state of a distant party's particle beyond what could be achieved with a separable state, by making measurements on one half of an entangled state. This type of quantum nonlocality stands out through its asymmetric setting, and even allows for cases where one party can steer the other, but where the reverse is not true. A series of experiments have demonstrated one-way steering in the past, but all were based on significant limiting assumptions. These consisted either of restrictions on the type of allowed measurements, or of assumptions about the quantum state at hand, by mapping to a specific family of states and analysing the ideal target state rather than the real experimental state. Here, we present the first experimental demonstration of one-way steering free of such assumptions. Although not required by our analysis, we achieve this using a novel source of extremely high-quality photonic Werner states. \\ ( https://arxiv.org/abs/1806.10279 , 1183kb) ------------------------------------------------------------------------------ \\ arXiv:1806.10285 (*cross-listing*) Date: Wed, 27 Jun 2018 03:35:43 GMT (198kb,D) Title: Cation Impact on Cobalt-Porphyrin Catalyzed Electrochemical Reduction of CO2 Authors: Kaito Miyamoto and Ryoji Asahi Categories: cond-mat.mes-hall cond-mat.mtrl-sci physics.chem-ph Comments: 14 pages, 2 figures \\ Cobalt-porphyrin catalyzed reductive decomposition mechanism of CO2 to CO is investigated based on the Kopers water facilitated CO2 reduction mechanism (Shen et al., Nat. Commun., 6, 8177 (2015).) using quantum chemistry calculations and a cobalt porphine (CoP) as a catalyst model. In particular, we focus for the first time on the influence of metal cation upon the proton transfer reaction from H2O, which forms key intermediate of CO generation. From the present study, it is found that the Na+ solvation reduces substantially the overpotential of the proton transfer from H2O. The redox potential of the above reaction (-0.74 V vs. RHE at pH=3) is only 0.3 V lower than the one-electron redox potential of CoP, and well agree with experimentally observed CO2 reduction potential (around -0.6 V). Since the potential can be controlled by changing not only the cation but also the catalyst, this redox potential is quite useful as a guide for the development of new salts and catalysts. \\ ( https://arxiv.org/abs/1806.10285 , 198kb) ------------------------------------------------------------------------------ \\ arXiv:1806.10300 (*cross-listing*) Date: Wed, 27 Jun 2018 04:55:38 GMT (535kb,D) Title: Quantum plasmonic sensing using single photons Authors: Joong-Sung Lee, Seung-Jin Yoon, Hyungju Rah, Mark Tame, Carsten Rockstuhl, Seok Ho Song, Changhyoup Lee, Kwang-Geol Lee Categories: quant-ph physics.optics Comments: 7 pages, 3 figures \\ Reducing the noise below the shot-noise limit in sensing devices is one of the key promises of quantum technologies. Here, by means of experiments and supported by a thorough theoretical analysis, we study quantum plasmonic sensing based on an attenuated total reflection configuration with single photons as input. Our sensor is the Kretschmann configuration with a gold film, and a blood protein in an aqueous solution with different concentrations serves as an analyte. The estimation of the refractive index is performed using heralded single photons. We also determine the estimation error from a statistical analysis over a number of repetitions of identical and independent experiments. We show that the errors of our plasmonic sensor with single photons are below the shot-noise limit even in the presence of various experimental imperfections. Our results demonstrate the practical application of quantum plasmonic sensing and paves the way for a future generation of quantum plasmonic applications based on similar techniques. \\ ( https://arxiv.org/abs/1806.10300 , 535kb) ------------------------------------------------------------------------------ \\ arXiv:1806.10355 (*cross-listing*) Date: Wed, 27 Jun 2018 09:09:52 GMT (2596kb,D) Title: In-flight performance of the DAMPE silicon tracker Authors: A. Tykhonov, G. Ambrosi, R. Asfandiyarov, P. Azzarello, P. Bernardini, B. Bertucci, A. Bolognini, F. Cadoux, A. D'Amone, A. De Benedittis, I. De Mitri, M. Di Santo, Y. F. Dong, M. Duranti, D. D'Urso, R. R. Fan, P. Fusco, V. Gallo, M. Gao, F. Gargano, S. Garrappa, K. Gong, M. Ionica, D. La Marra, F. Loparco, G. Marsella, M.N. Mazziotta, W. X. Peng, R. Qiao, M. M. Salinas, A. Surdo, V. Vagelli, S. Vitillo, H. Y. Wang, J. Z. Wang, Z. M. Wang, D. Wu, X. Wu, F. Zhang, J. Y. Zhang, H. Zhao and S. Zimmer Categories: astro-ph.IM physics.ins-det DOI: 10.1016/j.nima.2018.06.036 \\ DAMPE (DArk Matter Particle Explorer) is a spaceborne high-energy cosmic ray and gamma-ray detector, successfully launched in December 2015. It is designed to probe astroparticle physics in the broad energy range from few GeV to 100 TeV. The scientific goals of DAMPE include the identification of possible signatures of Dark Matter annihilation or decay, the study of the origin and propagation mechanisms of cosmic-ray particles, and gamma-ray astronomy. DAMPE consists of four sub-detectors: a plastic scintillator strip detector, a Silicon-Tungsten tracKer-converter (STK), a BGO calorimeter and a neutron detector. The STK is composed of six double layers of single-sided silicon micro-strip detectors interleaved with three layers of tungsten for photon conversions into electron-positron pairs. The STK is a crucial component of DAMPE, allowing to determine the direction of incoming photons, to reconstruct tracks of cosmic rays and to estimate their absolute charge (Z). We present the in-flight performance of the STK based on two years of in-flight DAMPE data, which includes the noise behavior, signal response, thermal and mechanical stability, alignment and position resolution. \\ ( https://arxiv.org/abs/1806.10355 , 2596kb) ------------------------------------------------------------------------------ \\ arXiv:1806.10368 (*cross-listing*) Date: Wed, 27 Jun 2018 09:36:37 GMT (5833kb,D) Title: Gaussian processes for choosing laser parameters for driven, dissipative Rydberg aggregates Authors: C. D. B. Bentley and A. Eisfeld Categories: quant-ph physics.atom-ph \\ To facilitate quantum simulation of open quantum systems at finite temperatures, an important ingredient is to achieve thermalization on a given time-scale. We consider a Rydberg aggregate (an arrangement of Rydberg atoms that interact via long-range interactions) embedded in a laser-driven atomic environment. For the smallest aggregate (two atoms), suitable laser parameters can be found by brute force scanning of the four tunable laser parameters. For more atoms, however, such parameter scans are too computationally costly. Here we apply Gaussian processes to predict the thermalization performance as a function of the laser parameters for two-atom and four-atom aggregates. These predictions perform remarkably well using just 1000 simulations, demonstrating the utility of Gaussian processes in an atomic physics setting. Using this approach, we find and present effective laser parameters for generating thermalization, the robustness of these parameters to variation, as well as different thermalization dynamics. \\ ( https://arxiv.org/abs/1806.10368 , 5833kb) ------------------------------------------------------------------------------ \\ arXiv:1806.10371 (*cross-listing*) Date: Wed, 27 Jun 2018 09:42:18 GMT (4387kb,D) Title: Simulation and validation of surfactant-laden drops in two-dimensional Stokes flow Authors: Sara P{\aa}lsson and Michael Siegel and Anna-Karin Tornberg Categories: math.NA physics.comp-ph \\ Performing highly accurate simulations of droplet systems is a challenging problem. This is primarily due to the interface dynamics which is complicated further by the addition of surfactants. This paper presents a boundary integral method for computing the evolution of surfactant-covered droplets in 2D Stokes flow. The method has spectral accuracy in space and the adaptive time-stepping scheme allows for control of the temporal errors. Previously available semi-analytical solutions (based on conformal-mapping techniques) are extended to include surfactants, and a set of algorithms is introduced to detail their evaluation. These semi-analytical solutions are used to validate and assess the accuracy of the boundary integral method, and it is demonstrated that the presented method maintains its high accuracy even when droplets are in close proximity. \\ ( https://arxiv.org/abs/1806.10371 , 4387kb) ------------------------------------------------------------------------------ \\ arXiv:1806.10373 (*cross-listing*) Date: Wed, 27 Jun 2018 09:44:48 GMT (424kb,D) Title: Application of the functional renormalization group to Bose gases: from linear to hydrodynamic fluctuation Authors: Felipe Isaule, Michael C. Birse, Niels R. Walet Categories: cond-mat.quant-gas nucl-th physics.atom-ph \\ We study weakly interacting Bose gases using the functional renormalization group with a hydrodynamic effective action. We use a scale-dependent parametrization of the boson fields that interpolates between a Cartesian representation at high momenta and an amplitude-phase one for low momenta. We apply this to Bose gases in two and three dimensions near the superfluid phase transition where they can be described by statistical O(2) models. In contrast to previous studies using the functional renormalization group, we obtain the correct physical behavior in the infrared and, in particular, we find a stable superfluid phase in two dimensions. We compare our results for the superfluid and boson densities with Monte-Carlo simulations, and we find they are in reasonable agreement. \\ ( https://arxiv.org/abs/1806.10373 , 424kb) ------------------------------------------------------------------------------ \\ arXiv:1806.10413 (*cross-listing*) Date: Wed, 27 Jun 2018 11:21:57 GMT (524kb,D) Title: Solitons in a chain of charge-parity-symmetric dimers Authors: O.B. Kirikchi, B. A. Malomed, N. Karjanto, R. Kusdiantara and H. Susanto Categories: nlin.PS physics.optics Comments: 12 pages, 8 figures MSC-class: 35Q55, 35C08, 37K40 \\ We consider an array of dual-core waveguides (which represent an optical realization of a chain of dimers) with an active (gain-loss) coupling between the cores, opposite signs of the discrete diffraction in the parallel arrays, and a sufficiently large phase-velocity mismatch between them, which is necessary for the overall stability of the system. The corresponding linear array provides an optical emulation of the charge-parity ($\mathcal{CP}$) symmetry. The addition of the intra-core cubic nonlinearity, despite breaking the $\mathcal{CP}$ symmetry, gives rise to several families of fundamental bright discrete solitons, whose existence and stability are explored here by means of analytical and numerical methods. An asymptotic analysis is presented for the case of weak intersite coupling between the dimers, as well as between the parallel cores. In particular, we find stable discrete solitons that have no counterparts in the continuum limit (CL), as well as a branch which carries over into a family of stable gap solitons in the CL. A soliton family which develops an oscillatory instability above a critical strength of the intersite coupling is found too. \\ ( https://arxiv.org/abs/1806.10413 , 524kb) ------------------------------------------------------------------------------ \\ arXiv:1806.10436 (*cross-listing*) Date: Wed, 27 Jun 2018 12:23:49 GMT (4012kb) Title: Numerical treatment of the nonconservative product in a multiscale fluid model for plasmas in thermal nonequilibrium: application to solar physics Authors: Quentin Wargnier (CMAP), Sylvain Faure (LM-Orsay), Benjamin Graille (LM-Orsay), Thierry Magin (VKI), Marc Massot (CMAP) Categories: math.NA astro-ph.SR math.AP physics.class-ph physics.plasm-ph \\ This contribution deals with the modeling of collisional multicomponent magnetized plasmas in thermal and chemical nonequilibrium aiming at simulating and predicting magnetic reconnections in the chromosphere of the sun. We focus on the numerical simulation of a simplified fluid model in order to properly investigate the influence on shock solutions of a nonconservative product present in the electron energy equation. Then, we derive jump conditions based on travelling wave solutions and propose an original numerical treatment in order to avoid non-physical shocks for the solution, that remains valid in the case of coarse-resolution simulations. A key element for the numerical scheme proposed is the presence of diffusion in the electron variables, consistent with the physically-sound scaling used in the model developed by Graille et al. following a multiscale Chapman-Enskog expansion method [M3AS, 19 (2009) 527--599]. The numerical strategy is eventually assessed in the framework of a solar physics test case. The computational method is able to capture the travelling wave solutions in both the highly- and coarsely-resolved cases. \\ ( https://arxiv.org/abs/1806.10436 , 4012kb) ------------------------------------------------------------------------------ \\ arXiv:1806.10470 (*cross-listing*) Date: Tue, 26 Jun 2018 10:27:07 GMT (16kb) Title: Predicting Uncertainty in Geometric Fluid Mechanics Authors: Fran\c{c}ois Gay-Balmaz and Darryl D. Holm Categories: nlin.CD physics.flu-dyn Comments: arXiv admin note: text overlap with arXiv:1802.05711 \\ We review opportunities for stochastic geometric mechanics to incorporate observed data into variational principles, in order to derive data-driven nonlinear dynamical models of effects on the variability of computationally resolvable scales of fluid motion, due to unresolvable, small, rapid scales of fluid motion. \\ ( https://arxiv.org/abs/1806.10470 , 16kb) ------------------------------------------------------------------------------ \\ arXiv:1806.10506 (*cross-listing*) Date: Wed, 27 Jun 2018 14:45:15 GMT (3040kb,D) Title: Measurement of optical losses in a high-finesse 300 m filter cavity for broadband quantum noise reduction in gravitational-wave detectors Authors: Eleonora Capocasa, Yuefan Guo, Marc Eisenmann, Yuhang Zhao, Akihiro Tomura, Koji Arai, Yoichi Aso, Manuel Marchi\`o, Laurent Pinard, Pierre Prat, Kentaro Somiya, Roman Schnabel, Matteo Tacca, Ryutaro Takahashi, Daisuke Tatsumi, Matteo Leonardi, Matteo Barsuglia, and Raffaele Flaminio Categories: astro-ph.IM gr-qc physics.optics \\ Earth-based gravitational-wave detectors will be limited by quantum noise in a large part of their spectrum. The most promising technique to achieve a broadband reduction of such noise is the injection of a frequency dependent squeezed vacuum state from the output port of the detector, whit the squeeze angle rotated by the reflection off a Fabry-Perot filter cavity. One of the most important parameters limiting the squeezing performance is represented by the optical losses of the filter cavity. We report here the operation of a 300 m filter cavity prototype installed at the National Astronomical Observatory of Japan (NAOJ). The cavity is designed to obtain a rotation of the squeeze angle below 100 Hz. After achieving the resonance of the cavity with a multi-wavelength technique, the round trip losses have been measured to be between 50 ppm and 90 ppm. This result demonstrates that with realistic assumption on the input squeeze factor and on the other optical losses, a quantum noise reduction of at least 4 dB in the frequency region dominated by radiation pressure can be achieved. \\ ( https://arxiv.org/abs/1806.10506 , 3040kb) ------------------------------------------------------------------------------ \\ arXiv:1806.10536 (*cross-listing*) Date: Wed, 27 Jun 2018 15:35:22 GMT (507kb,D) Title: Topological Time Crystals Authors: K. Giergiel, A. Dauphin, M. Lewenstein, J. Zakrzewski, and K. Sacha Categories: cond-mat.quant-gas cond-mat.mes-hall physics.atom-ph quant-ph Comments: 6 pages, 3 figures \\ By analogy with the spontaneous formation of space crystals, crystalline structures can also appear in the time domain. While in the case of space crystals we often ask about periodic arrangements of atoms in space at a moment of a detection, in time crystals the role of space and time is exchanged. That is, we fix a space point and ask if the probability density for detection of a system at this point behaves periodically in time. Here, we show that in periodically driven systems it is possible to realize topological insulators, which can be observed in time. The bulk-edge correspondence is related to the edge in time, where edge states localize. We focus on two examples: Su-Schrieffer-Heeger (SSH) model in time and Bose Haldane insulator which emerges in periodically driven many-body system. \\ ( https://arxiv.org/abs/1806.10536 , 507kb) ------------------------------------------------------------------------------ \\ arXiv:1806.10567 (*cross-listing*) Date: Wed, 27 Jun 2018 16:55:54 GMT (3498kb,D) Title: Accelerating high-throughput searches for new alloys with active learning of interatomic potentials Authors: Konstantin Gubaev, Evgeny V. Podryabinkin, Gus L. W. Hart, Alexander V. Shapeev Categories: cond-mat.mtrl-sci physics.comp-ph \\ We propose an approach to materials prediction that uses a machine-learning interatomic potential to approximate quantum-mechanical energies and an active learning algorithm for the automatic selection of an optimal training dataset. Our approach significantly reduces the amount of DFT calculations needed, resorting to DFT only to produce the training data, while structural optimization is performed using the interatomic potentials. Our approach is not limited to one (or a small number of) lattice types (as is the case for cluster expansion, for example) and can predict structures with lattice types not present in the training dataset. We demonstrate the effectiveness of our algorithm by predicting the convex hull for the following three systems: Cu-Pd, Co-Nb-V, and Al-Ni-Ti. Our method is three to four orders of magnitude faster than conventional high-throughput DFT calculations and explores a wider range of materials space. In all three systems, we found unreported stable structures compared to the AFLOW database. Because our method is much cheaper and explores much more of materials space than high-throughput methods or cluster expansion, and because our interatomic potentials have a systematically improvable accuracy compared to empirical potentials such as EAM, etc., it will have a significant impact in the discovery of new alloy phases, particularly those with three or more components. \\ ( https://arxiv.org/abs/1806.10567 , 3498kb) %%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%% ------------------------------------------------------------------------------ \\ arXiv:1609.07719 (*cross-listing*) replaced with revised version Wed, 27 Jun 2018 16:26:33 GMT (7403kb,D) Title: Multiscale modeling, discretization, and algorithms: a survey in biomechanics Authors: Marco Favino, Alessio Quaglino, Sonia Pozzi, Rolf Krause, Igor Pivkin Categories: math.NA cs.CE physics.comp-ph \\ ( https://arxiv.org/abs/1609.07719 , 7403kb) ------------------------------------------------------------------------------ \\ arXiv:1610.00504 replaced with revised version Wed, 27 Jun 2018 14:29:36 GMT (114kb,D) Title: Non-perturbative guiding center and stochastic gyrocenter transformations: gyro-phase is the Kaluza-Klein 5^th dimension also for reconciling General Relativity with Quantum Mechanics Authors: Claudio Di Troia Categories: physics.plasm-ph Comments: 36 pages, 1 figure Journal-ref: Journal of Modern Physics, 2018, 9, 701-752 DOI: 10.4236/jmp.2018.94048 \\ ( https://arxiv.org/abs/1610.00504 , 114kb) ------------------------------------------------------------------------------ \\ arXiv:1704.02587 (*cross-listing*) replaced with revised version Wed, 27 Jun 2018 09:40:29 GMT (34kb) Title: On the Incompatibility of Special Relativity and Quantum Mechanics Authors: Marco Mamone-Capria Categories: gr-qc physics.hist-ph Comments: Expanded and slightly edited version \\ ( https://arxiv.org/abs/1704.02587 , 34kb) ------------------------------------------------------------------------------ \\ arXiv:1704.06565 replaced with revised version Wed, 27 Jun 2018 14:01:54 GMT (3816kb) Title: An efficient method to estimate sorption isotherm curve coefficients Authors: Julien Berger (LOCIE, PUCPR), Thomas Busser (DTS, LOCIE, INES), Denys Dutykh (LAMA), Nathan Mendes (PUCPR), Polytech Annecy, -- Chamb\'ery, France Locie Categories: physics.app-ph math.NA physics.class-ph Comments: 51 pages, 20 figures, 4 tables and 56 references. Other author's papers can be downloaded at http://www.denys-dutykh.com/ \\ ( https://arxiv.org/abs/1704.06565 , 3816kb) ------------------------------------------------------------------------------ \\ arXiv:1707.03055 (*cross-listing*) replaced with revised version Tue, 26 Jun 2018 22:30:18 GMT (4083kb,D) Title: Analyzing Reconstruction Artifacts from Arbitrary Incomplete X-ray CT Data Authors: Leise Borg, Jurgen Frikel, Jakob Sauer Jorgensen, Eric Todd Quinto Categories: math.FA math.AP physics.ins-det MSC-class: 44A12, 92C55, 35S30, 58J40 \\ ( https://arxiv.org/abs/1707.03055 , 4083kb) ------------------------------------------------------------------------------ \\ arXiv:1710.07843 replaced with revised version Tue, 26 Jun 2018 22:28:12 GMT (1434kb,D) Title: Generating compressed broadband terahertz pulses using aperiodically poled electro-optic crystals Authors: Koustuban Ravi, Franz X K\"artner Categories: physics.optics \\ ( https://arxiv.org/abs/1710.07843 , 1434kb) ------------------------------------------------------------------------------ \\ arXiv:1710.09816 (*cross-listing*) replaced with revised version Wed, 27 Jun 2018 09:16:42 GMT (1937kb,D) Title: Acoustic response in a a one-dimensional layered pseudo-Hermitian metamaterial containing defects Authors: D. Psiachos and M. M. Sigalas Categories: cond-mat.mtrl-sci physics.class-ph Comments: Changed title, made revisions Journal-ref: Journal of Applied Physics v.123 p.245109 (2018) DOI: 10.1063/1.5027457 \\ ( https://arxiv.org/abs/1710.09816 , 1937kb) ------------------------------------------------------------------------------ \\ arXiv:1712.03089 replaced with revised version Wed, 27 Jun 2018 17:17:59 GMT (22kb) Title: Ascendancy of potentials over fields in electrodynamics Authors: H. R. Reiss Categories: physics.gen-ph \\ ( https://arxiv.org/abs/1712.03089 , 22kb) ------------------------------------------------------------------------------ \\ arXiv:1712.08053 (*cross-listing*) replaced with revised version Wed, 27 Jun 2018 12:43:16 GMT (183kb) Title: Derivation of a hydrodynamic theory for mesoscale dynamics in microswimmer suspensions Authors: Henning Reinken, Sabine H. L. Klapp, Markus B\"ar, Sebastian Heidenreich Categories: cond-mat.soft physics.flu-dyn Journal-ref: Phys. Rev. E 97, 022613 (2018) DOI: 10.1103/PhysRevE.97.022613 \\ ( https://arxiv.org/abs/1712.08053 , 183kb) ------------------------------------------------------------------------------ \\ arXiv:1801.05207 replaced with revised version Wed, 27 Jun 2018 09:43:42 GMT (415kb,D) Title: Dynamical resonance shift and unification of resonances in short-pulse laser cluster interaction Authors: S. S. Mahalik and M. Kundu Categories: physics.plasm-ph Comments: 12 pages, 7 figures Journal-ref: Phys. Rev. A 97, 063406 (2018) DOI: 10.1103/PhysRevA.97.063406 \\ ( https://arxiv.org/abs/1801.05207 , 415kb) ------------------------------------------------------------------------------ \\ arXiv:1801.07948 replaced with revised version Wed, 27 Jun 2018 09:56:16 GMT (1524kb,D) Title: Empirical observations of ultraslow diffusion driven by the fractional dynamics in languages: Dynamical statistical properties of word counts of already popular words Authors: Hayafumi Watanabe Categories: physics.soc-ph cs.CL cs.CY \\ ( https://arxiv.org/abs/1801.07948 , 1524kb) ------------------------------------------------------------------------------ \\ arXiv:1802.02253 replaced with revised version Wed, 27 Jun 2018 00:15:42 GMT (1140kb,D) Title: Reconfigurable topological phases in next-nearest-neighbor coupled resonator lattices Authors: Daniel Leykam, S. Mittal, M. Hafezi, Y. D. Chong Categories: physics.optics cond-mat.mes-hall quant-ph Comments: 5+5 pages, 3+5 figures, to appear in Phys. Rev. Lett \\ ( https://arxiv.org/abs/1802.02253 , 1140kb) ------------------------------------------------------------------------------ \\ arXiv:1802.05012 (*cross-listing*) replaced with revised version Wed, 27 Jun 2018 08:08:37 GMT (666kb) Title: 'Getting out of the closet': Scientific authorship of literary fiction and knowledge transfer Authors: Joaqu\'in M. Azagra-Caro, Anabel Fern\'andez-Mesa and Nicol\'as Robinson-Garc\'ia Categories: cs.DL physics.soc-ph Comments: Paper published in Journal of Technology Transfer Journal-ref: Azagra-Caro, J.M., Fern\'andez-Mesa, A., Robinson-Garcia, N. (2018). 'Getting out of the closet': Scientific authorship of literary fiction and knowledge transfer. Journal of Technology Transfer. doi:10.1007/s10961-018-9672-6 DOI: 10.1007/s10961-018-9672-6 \\ ( https://arxiv.org/abs/1802.05012 , 666kb) ------------------------------------------------------------------------------ \\ arXiv:1803.02093 (*cross-listing*) replaced with revised version Wed, 27 Jun 2018 16:43:34 GMT (3291kb) Title: Twist-induced crossover from 2D to 3D turbulence in active nematics Authors: Tyler N. Shendruk, Kristian Thijssen, Julia M. Yeomans and Amin Doostmohammadi Categories: cond-mat.soft physics.flu-dyn Comments: Accepted for PRE Rapid Communications \\ ( https://arxiv.org/abs/1803.02093 , 3291kb) ------------------------------------------------------------------------------ \\ arXiv:1803.05761 replaced with revised version Wed, 27 Jun 2018 10:08:53 GMT (314kb) Title: Stability of velocity-Verlet- and Liouville-operator-derived algorithms to integrate non-Hamiltonian systems Authors: Hiroshi Watanabe Categories: physics.comp-ph Comments: 9 pages, 5 figures \\ ( https://arxiv.org/abs/1803.05761 , 314kb) ------------------------------------------------------------------------------ \\ arXiv:1803.05973 replaced with revised version Wed, 27 Jun 2018 15:54:02 GMT (7692kb,D) Title: Tunable high-resolution macroscopic self-engineered geometric phase optical elements Authors: Etienne Brasselet Categories: physics.optics \\ ( https://arxiv.org/abs/1803.05973 , 7692kb) ------------------------------------------------------------------------------ \\ arXiv:1803.06663 replaced with revised version Wed, 27 Jun 2018 15:52:19 GMT (481kb,D) Title: Direct Measurement of Focusing Fields in Active Plasma Lenses Authors: J.-H. R\"ockemann, L. Schaper, S. K. Barber, N. A. Bobrova, G. Boyle, S. Bulanov, N. Delbos, K. Floettmann, G. Kube, W. Lauth, W. P. Leemans, V. Libov, A. Maier, M. Meisel, P. Messner, P. V. Sasorov, C. B. Schroeder, J. van Tilborg, S. Wesch, and J. Osterhoff Categories: physics.acc-ph Comments: 13 pages, 6 Figures \\ ( https://arxiv.org/abs/1803.06663 , 481kb) ------------------------------------------------------------------------------ \\ arXiv:1803.10502 replaced with revised version Wed, 27 Jun 2018 11:51:57 GMT (1531kb) Title: A five-equation model for the simulation of miscible and viscous compressible fluids Authors: Ben Thornber, Michael Groom, David Youngs Categories: physics.comp-ph DOI: 10.1016/j.jcp.2018.06.028 \\ ( https://arxiv.org/abs/1803.10502 , 1531kb) ------------------------------------------------------------------------------ \\ arXiv:1804.01173 replaced with revised version Wed, 27 Jun 2018 13:28:29 GMT (3kb) Title: Comment on "Minimum Action Path Theory Reveals the Details of Stochastic Transitions Out of Oscillatory States" Authors: Baruch Meerson and Naftali R. Smith Categories: physics.bio-ph cond-mat.stat-mech \\ ( https://arxiv.org/abs/1804.01173 , 3kb) ------------------------------------------------------------------------------ \\ arXiv:1804.02251 (*cross-listing*) replaced with revised version Tue, 26 Jun 2018 20:47:18 GMT (548kb,D) Title: This One Simple Trick Disrupts Digital Communities Authors: Philip Feldman, Aaron Dant, and Wayne Lutters Categories: cs.MA cs.CY cs.SI physics.soc-ph ACM-class: I.2.11; H.1.2; H.3.3; H.5.3 \\ ( https://arxiv.org/abs/1804.02251 , 548kb) ------------------------------------------------------------------------------ \\ arXiv:1804.05273 (*cross-listing*) replaced with revised version Wed, 27 Jun 2018 12:06:06 GMT (2502kb,D) Title: Fusion of hyperspectral and ground penetrating radar to estimate soil moisture Authors: Felix M. Riese, Sina Keller Categories: cs.CV physics.geo-ph Comments: This work has been accepted to the IEEE WHISPERS 2018 conference. (C) 2018 IEEE \\ ( https://arxiv.org/abs/1804.05273 , 2502kb) ------------------------------------------------------------------------------ \\ arXiv:1804.08422 replaced with revised version Wed, 27 Jun 2018 03:10:33 GMT (479kb,D) Title: Robustness and fragility of the susceptible-infected-susceptible epidemic models on complex networks Authors: Wesley Cota, Ang\'elica S. Mata, Silvio C. Ferreira Categories: physics.soc-ph Comments: 13 pages, 8 figures \\ ( https://arxiv.org/abs/1804.08422 , 479kb) ------------------------------------------------------------------------------ \\ arXiv:1805.01092 replaced with revised version Tue, 26 Jun 2018 20:26:55 GMT (489kb) Title: Room-temperature continuous-wave operation of organometal halide perovskite lasers Authors: Zhitong Li, Jiyoung Moon, Abouzar Gharajeh, Ross Haroldson, Roberta Hawkins, Walter Hu, Anvar Zakhidov, Qing Gu Categories: physics.optics physics.app-ph Comments: 16 pages, 4 figures \\ ( https://arxiv.org/abs/1805.01092 , 489kb) ------------------------------------------------------------------------------ \\ arXiv:1805.05871 (*cross-listing*) replaced with revised version Wed, 27 Jun 2018 06:42:57 GMT (17kb) Title: Angular momentum and local gravitational instability in galaxy discs: does $Q$ correlate with $j$ or $M\,$? Authors: Alessandro B. Romeo, Keoikantse Moses Mogotsi Categories: astro-ph.GA astro-ph.CO physics.plasm-ph Comments: MNRAS Letters, in press. Minor revision to match the accepted version (added Fig. 1, Sect. 3.2, the final paragraph of Sect. 4, references and clarifications) \\ ( https://arxiv.org/abs/1805.05871 , 17kb) ------------------------------------------------------------------------------ \\ arXiv:1805.11037 (*cross-listing*) replaced with revised version Wed, 27 Jun 2018 15:19:03 GMT (528kb,D) Title: Multilayer test masses to enhance the collapse noise Authors: Matteo Carlesso, Andrea Vinante, Angelo Bassi Categories: quant-ph physics.ins-det \\ ( https://arxiv.org/abs/1805.11037 , 528kb) ------------------------------------------------------------------------------ \\ arXiv:1806.07034 replaced with revised version Wed, 27 Jun 2018 16:39:58 GMT (241kb,D) Title: Mitigation of envelope instability through fast acceleration Authors: Ji Qiang Categories: physics.acc-ph \\ ( https://arxiv.org/abs/1806.07034 , 241kb) ------------------------------------------------------------------------------ \\ arXiv:1806.07289 replaced with revised version Wed, 27 Jun 2018 17:31:39 GMT (376kb,D) Title: Naturalness, Extra-Empirical Theory Assessments, and the Implications of Skepticism Authors: James D. Wells Categories: physics.hist-ph hep-ph hep-th Comments: 19 pages, 6 figures. v2: minor typos and refs \\ ( https://arxiv.org/abs/1806.07289 , 376kb) ------------------------------------------------------------------------------ \\ arXiv:1806.07599 replaced with revised version Wed, 27 Jun 2018 13:12:40 GMT (5352kb,D) Title: Thrifty swimming with shear-thinning Authors: David A. Gagnon and Thomas D. Montenegro-Johnson Categories: physics.flu-dyn cond-mat.soft Journal-ref: The ANZIAM Journal, (2018) 1-12 DOI: 10.1017/S1446181118000032 \\ ( https://arxiv.org/abs/1806.07599 , 5352kb) ------------------------------------------------------------------------------ \\ arXiv:1806.07821 replaced with revised version Wed, 27 Jun 2018 02:00:51 GMT (1654kb,D) Title: Phase-Space Wavepacket Dynamics of Internal Conversion via Conical Intersection: Multi-State Quantum Fokker-Planck Equation Approach Authors: Tatsushi Ikeda and Yoshitaka Tanimura Categories: physics.chem-ph Comments: 13 pages, 9 figures \\ ( https://arxiv.org/abs/1806.07821 , 1654kb) ------------------------------------------------------------------------------ \\ arXiv:1806.07825 replaced with revised version Wed, 27 Jun 2018 15:21:57 GMT (230kb) Title: Cyclotron and combined phonon-assisted resonances in double-well heterostructure In$_{0.65}$Ga$_{0.35}$As/In$_{0.52}$Al$_{0.48}$As at megagauss magnetic fields Authors: M. Zybert, M. Marchewka, and E. M. Sheregii, P. Pfeffer, and W. Zawadzki, D. G. Rickel, J. B. Betts, F. F. Balakirev, M. Gordon, C. H. Mielke Categories: physics.app-ph cond-mat.mes-hall \\ ( https://arxiv.org/abs/1806.07825 , 230kb) ------------------------------------------------------------------------------ \\ arXiv:1806.09904 replaced with revised version Wed, 27 Jun 2018 09:57:43 GMT (1326kb) Title: The combined effects of shear and buoyancy on phase boundary stability Authors: Srikanth Toppaladoddi and John S. Wettlaufer Categories: physics.flu-dyn Comments: 9 pages, 10 figures \\ ( https://arxiv.org/abs/1806.09904 , 1326kb) %%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%--- For subscribe options to combined physics archives, e-mail To: physics@arxiv.org, Subject: subscribe ----------------------------------------------------------------------------- For help on viewing and making submissions, see http://arxiv.org/help/