Date: Wed, 29 Jun 11 00:07:23 GMT Subject: hep-th daily 16 new + 16 crosses received by eprepget ------------------------------------------------------------------------------ ------------------------------------------------------------------------------ Send any comments regarding submissions directly to submitter. ------------------------------------------------------------------------------ Archives at http://arxiv.org/ To unsubscribe, e-mail To: hep-th@arXiv.org, Subject: cancel ------------------------------------------------------------------------------ received by eprepget from Mon 27 Jun 11 20:00:00 GMT to Tue 28 Jun 11 20:00:00 GMT ------------------------------------------------------------------------------ \\ arXiv:1106.5503 Date: Mon, 27 Jun 2011 20:00:04 GMT (20kb) Title: Comments on Worldsheet Description of the Omega Background Authors: Yu Nakayama and Hirosi Ooguri Categories: hep-th Comments: 11 pages Report-no: CALT-68-2837, IPMU11-0094 \\ Nekrasov's partition function is defined on a flat bundle of R^4 over S^1 called the Omega background. When the fibration is self-dual, the partition function is known to be equal to the topological string partition function, which computes scattering amplitudes of self-dual gravitons and graviphotons in type II superstring compactified on a Calabi-Yau manifold. We propose a generalization of this correspondence when the fibration is not necessarily self-dual. \\ ( http://arxiv.org/abs/1106.5503 , 20kb) ------------------------------------------------------------------------------ \\ arXiv:1106.5534 Date: Mon, 27 Jun 2011 22:21:42 GMT (12kb) Title: Lorentz-invariance violating effects in the Bose-Einstein condensation of an ideal bosonic gas Authors: Rodolfo Casana and Kleber A. T. da Silva Categories: hep-th cond-mat.quant-gas Comments: 9 pages Latex2e \\ We have studied the effects of Lorentz-invariance violation in the Bose-Einstein condensation (BEC) of an ideal bosonic gas, assessing both the nonrelativistic and ultrarelativistic limits. Our model describes a massive complex scalar field coupled to a CPT-even and Lorentz-violating background. First, by starting from the nonrelativistic limit of our model and by using experimental data, we give upper limits for some parameters of our model. But, the existence of the nonrelativistic BEC, in a Lorentz-invariance violating (LIV) framework, imposes strong restrictions on some LIV parameters. It is shown that only the critical temperature gains LIV contributions. In the sequel, we analyze the ultrarelativistic Bose-Einstein condensation, constructing a well-defined partition function for the relativistic bosonic ideal gas, from which severe constraints on certain LIV parameters are imposed. The analysis of the ultrarelativistic BEC has shown that the critical temperature and the critical chemical potential are slightly affected by LIV contributions. \\ ( http://arxiv.org/abs/1106.5534 , 12kb) ------------------------------------------------------------------------------ \\ arXiv:1106.5558 Date: Tue, 28 Jun 2011 03:18:01 GMT (269kb) Title: Fermionic Casimir effect with helix boundary condition Authors: Xiang-hua Zhai, Xin-zhou Li and Chao-Jun Feng Categories: hep-th quant-ph Comments: 7 pages, 4 figures, published in Eur. Phys. J. C Journal-ref: Eur. Phys. J. C(2011)71:1654 DOI: 10.1140/epjc/s10052-011-1654-x \\ In this paper, we consider the fermionic Casimir effect under a new type of space-time topology using the concept of quotient topology. The relation between the new topology and that in Ref. \cite{Feng,Zhai3} is something like that between a M\"obius strip and a cylindric. We obtain the exact results of the Casimir energy and force for the massless and massive Dirac fields in the ($D+1$)-dimensional space-time. For both massless and massive cases, there is a $Z_2$ symmetry for the Casimir energy. To see the effect of the mass, we compare the result with that of the massless one and we found that the Casimir force approaches the result of the force in the massless case when the mass tends to zero and vanishes when the mass tends to infinity. \\ ( http://arxiv.org/abs/1106.5558 , 269kb) ------------------------------------------------------------------------------ \\ arXiv:1106.5578 Date: Tue, 28 Jun 2011 07:25:40 GMT (69kb) Title: Anomalous Quantum Hall Effect of 4D Graphene in Background Fields Authors: L.B Drissi, H. Mhamdi, E.H Saidi Categories: hep-th hep-lat Comments: LaTex, 23 pages, 1 figure Report-no: LPHE-CPM-11-05 \\ Bori\c{c}i-Creutz (BC) model describing the dynamics of light quarks in lattice QCD has been shown to be intimately linked to the four dimensional extension of 2D graphene refereed below to as four dimensional graphene (4D- graphene). Borrowing ideas from the field theory description of the usual 2D graphene, we study in this paper the anomalous quantum Hall effect (AQHE) of the BC fermions in presence of a constant background electromagnetic field strength F_{{\mu}{\nu}} with a special focuss on the case F_{{\mu}{\nu}}=B{\epsilon}_{{\mu}{\nu}34}+E{\epsilon}_{12{\mu}{\nu}} with B and E two real moduli and detF_{{\mu}{\nu}}=B^2\timesE^2. First, we revisit the anomalous 2D graphene by using QFT method. Then, we consider the AQHE of BC fermions for both regular detF_{{\mu}{\nu}}\not=0 and singular detF_{{\mu}{\nu}}=0 cases. We show, amongst others, that the exact solutions of the BC fermions coupled to constant F_{{\mu}{\nu}} have a 5D interpretation; and the filling factor {\nu}_{BC} of the BC model coupled to constant F_{{\mu}{\nu}} is given by 24(((2N+1)(2M+1))/2) with N, M positive integers. Others features, such as F_{{\mu}{\nu}}^{QCD}\not=0, are also discussed. Key words: Lattice QCD, Bori\c{c}i-Creutz fermions, Anomalous Quantum Hall Effect, filling factor, four dimensional graphene. \\ ( http://arxiv.org/abs/1106.5578 , 69kb) ------------------------------------------------------------------------------ \\ arXiv:1106.5590 Date: Tue, 28 Jun 2011 08:24:16 GMT (123kb) Title: A non-perturbative formulation of N=4 super Yang-Mills theory based on the large-N reduction Authors: Goro Ishiki, Shinji Shimasaki, Asato Tsuchiya Categories: hep-th Comments: 42 pages, 5 figures Report-no: KUNS-2347 \\ We study a non-perturbative formulation of N=4 super Yang-Mills theory (SYM) on RxS^3 proposed in arXiv:0807.2352. This formulation is based on the large-N reduction, and the theory can be described as a particular large-N limit of the plane wave matrix model (PWMM), which is obtained by dimensionally reducing the original theory over S^3. In this paper, we perform some tests for this proposal. We construct an operator in the PWMM that corresponds to the Wilson loop in SYM in the continuum limit and calculate the vacuum expectation value of the operator for the case of the circular contour. We find that our result indeed agrees with the well-known result first obtained by Erickson, Semenoff and Zarembo. We also compute the beta function at the 1-loop level based on this formulation and see that it is indeed vanishing. \\ ( http://arxiv.org/abs/1106.5590 , 123kb) ------------------------------------------------------------------------------ \\ arXiv:1106.5608 Date: Tue, 28 Jun 2011 09:51:20 GMT (24kb) Title: A Multiple Step-like Spectrum of Primordial Perturbation Authors: Jie Liu, Yun-Song Piao Categories: hep-th gr-qc \\ We show that if the inflaton effective potential has multiple discontinuous points in its first derivative, the spectrum of primordial perturbation will be multiple step-like. We give a general analysis by applying a simple model. In principle, as long as the height of step is low enough, the result of spectrum will be consistent with observations. \\ ( http://arxiv.org/abs/1106.5608 , 24kb) ------------------------------------------------------------------------------ \\ arXiv:1106.5628 Date: Tue, 28 Jun 2011 11:13:58 GMT (450kb) Title: Unitarity alternatives in the reduced-action model for gravitational collapse Authors: M.Ciafaloni, D.Colferai and G.Falcioni Categories: hep-th Comments: latex, 31 pages, 9 eps figures \\ Based on the ACV approach to transplanckian energies, the reduced-action model for the gravitational S-matrix predicts a critical impact parameter b_c ~ R = 2 G sqrt{s} such that S-matrix unitarity is satisfied in the perturbative region b > b_c, while it is exponentially suppressed with respect to s in the region b < b_c that we think corresponds to gravitational collapse. Here we definitely confirm this statement by a detailed analysis of both the critical region b ~ b_c and of further possible contributions due to quantum transitions for b < b_c. We point out, however, that the subcritical unitarity suppression is basically due to the boundary condition which insures that the solutions of the model be ultraviolet-safe. As an alternative, relaxing such condition leads to solutions which carry short-distance singularities presumably regularized by the string. We suggest that through such solutions - depending on the detailed dynamics at the string scale - the lost probability may be recovered. \\ ( http://arxiv.org/abs/1106.5628 , 450kb) ------------------------------------------------------------------------------ \\ arXiv:1106.5656 Date: Tue, 28 Jun 2011 13:19:08 GMT (9kb) Title: Three-point Correlation Function of Giant Magnons in the Lunin-Maldacena background Authors: Changrim Ahn and Plamen Bozhilov Categories: hep-th Comments: 11 pages \\ We compute semiclassical three-point correlation function, or structure constant, of two finite-size (dyonic) giant magnon string states and a light dilaton mode in the Lunin-Maldacena background, which is the \gamma-deformed, or TsT-transformed AdS_5 x S_{\gamma}^5, dual to N = 1 super Yang-Mills theory. We also prove that an important relation between the structure constant and the conformal dimension, checked for the N = 4 super Yang-Mills case, still holds for the \gamma-deformed string background. \\ ( http://arxiv.org/abs/1106.5656 , 9kb) ------------------------------------------------------------------------------ \\ arXiv:1106.5661 Date: Tue, 28 Jun 2011 13:40:41 GMT (3kb) Title: Electromagnetic Mach principle Authors: E . I. Guendelman and R. Steiner Categories: hep-th gr-qc Comments: 3 pages \\ We will introduce a gauge model which an electromagnetic coupling constant and local mass are related to all the charge in the universe. we will use the standard Dirac action, but where the mass and the electromagnetic coupling constant are a function of the sum of all the charge in the universe, which represent Mach principle for electromagnetic coupling constant. The formalisation is not manifestly Lorentz invariant, however Lorentz invariance can be restored by performing a phase transformation of the Dirac field. \\ ( http://arxiv.org/abs/1106.5661 , 3kb) ------------------------------------------------------------------------------ \\ arXiv:1106.5684 Date: Tue, 28 Jun 2011 14:31:24 GMT (11kb) Title: Classical strings in $AdS_4\times\mathbb{CP}^3$ with three angular momenta Authors: Sergio Giardino and Hector L. Carri\'on Categories: hep-th \\ In this paper, rotating strings in three directions of $AdS_4 \times \mathbb{CP}^3$ geometry are studied; its divergent energy limit, and conserved charges are also determined. An interpretation of these configurations as either giant magnons or spiky strings are discussed. \\ ( http://arxiv.org/abs/1106.5684 , 11kb) ------------------------------------------------------------------------------ \\ arXiv:1106.5698 Date: Tue, 28 Jun 2011 15:10:11 GMT (27kb) Title: On 2d TQFTs whose values are holomorphic symplectic varieties Authors: Gregory W. Moore and Yuji Tachikawa Categories: hep-th math.AG math.DG math.QA Comments: 15 pages, to appear in the proceedings of String-Math 2011 conference \\ For simple and simply-connected complex algebraic group G, we conjecture the existence of a functor eta_G from the category of 2-bordisms to the category of holomorphic symplectic varieties with Hamiltonian action, such that gluing of boundaries corresponds to the holomorphic symplectic quotient with respect to the diagonal action of G. We describe various properties of eta_G obtained via string-theoretic analysis. Mathematicians are urged to construct eta_G rigorously. \\ ( http://arxiv.org/abs/1106.5698 , 27kb) ------------------------------------------------------------------------------ \\ arXiv:1106.5708 Date: Tue, 28 Jun 2011 15:25:01 GMT (69kb) Title: Algebraic deformations of toric varieties II. Noncommutative instantons Authors: Lucio Cirio, Giovanni Landi and Richard J. Szabo Categories: hep-th math.AG math.QA Comments: 62 pages Report-no: HWM-11-19 , EMPG-11-18 \\ We continue our study of the noncommutative algebraic and differential geometry of a particular class of deformations of toric varieties, focusing on aspects pertinent to the construction and enumeration of noncommutative instantons on these varieties. We develop a noncommutative version of twistor theory, which introduces a new example of a noncommutative four-sphere. We develop a braided version of the ADHM construction and show that it parametrizes a certain moduli space of framed torsion free sheaves on a noncommutative projective plane. We use these constructions to explicitly build instanton gauge bundles with canonical connections on the noncommutative four-sphere that satisfy appropriate anti-selfduality equations. We construct projective moduli spaces for the torsion free sheaves and demonstrate that they are smooth. We define equivariant partition functions of these moduli spaces, finding that they coincide with the usual instanton partition functions for supersymmetric gauge theories on C^2. \\ ( http://arxiv.org/abs/1106.5708 , 69kb) ------------------------------------------------------------------------------ \\ arXiv:1106.5715 Date: Tue, 28 Jun 2011 16:05:30 GMT (18kb) Title: Unravelling Mathieu Moonshine Authors: Suresh Govindarajan (IITM) Categories: hep-th math.NT math.RT Comments: 20 pages Report-no: IITM/PH/TH/2011/3 \\ The D1-D5-KK-p system naturally provides an infinite dimensional module graded by the dyonic charges whose dimensions are counted by the Igusa cusp form, Phi_{10}(Z)$. We show that the Mathieu group, M_{24}, acts on this module by recovering the Siegel modular forms that count twisted dyons as a trace over this module. This is done by recovering Borcherds product formulae for these modular forms using the M_{24} action. This establishes the correspondence (`moonshine') proposed in arXiv:0907.1410 that relates conjugacy classes of M_{24} to Siegel modular forms. This also, in a sense that we make precise, subsumes existing moonshines for M_{24} that relates its conjugacy classes to eta-products and Jacobi forms. \\ ( http://arxiv.org/abs/1106.5715 , 18kb) ------------------------------------------------------------------------------ \\ arXiv:1106.5719 Date: Tue, 28 Jun 2011 16:25:01 GMT (10kb) Title: 4D gravity on a non-BPS bent dilatonic brane Authors: R.C. Fonseca, F.A. Brito, L. Losano Categories: hep-th gr-qc hep-ph Comments: 6 pages, no figures, Latex \\ We investigate the localization of metastable four-dimensional gravity around a bent dilatonic brane, embedded into a five-dimensional space, that exists only up to distances sufficiently small compared to a crossover scale. Far from such scale, five-dimensional effects strongly deviate the Newtonian potential. We study this effect by considering localization of massive gravity on a non-BPS bent dilatonic 3-brane solution of a five-dimensional supergravity. Our results show that the cosmological constant on the bent brane controls the size of the crossover scale. For sufficiently small positive cosmological constant, that is in accord with the present observations, the crossover scale becomes very large. \\ ( http://arxiv.org/abs/1106.5719 , 10kb) ------------------------------------------------------------------------------ \\ arXiv:1106.5763 Date: Tue, 28 Jun 2011 18:59:56 GMT (727kb,D) Title: Wilson Loops in N=2 Super-Yang-Mills from Matrix Model Authors: F. Passerini and K. Zarembo Categories: hep-th Comments: 36 pages, 9 figures Report-no: HU-EP-11/27, ITEP-TH-18/11, NORDITA-2011-48, UUITP-19/11 \\ We compute the expectation value of the circular Wilson loop in N=2 supersymmetric Yang-Mills theory with N_f=2N hypermultiplets. Our results indicate that the string tension in the dual string theory scales as the logarithm of the 't Hooft coupling. \\ ( http://arxiv.org/abs/1106.5763 , 727kb) ------------------------------------------------------------------------------ \\ arXiv:1106.5766 Date: Tue, 28 Jun 2011 19:15:38 GMT (11kb) Title: Consistency of the Hamiltonian formulation of the lowest-order effective action of the complete Ho\vrava theory Authors: Jorge Bellor\'in and Alvaro Restuccia Categories: hep-th gr-qc \\ We perform the Hamiltonian analysis for the lowest-order effective action, up to second-order in derivatives, of the complete Horava theory. The model includes the invariant terms that depend on \partial_i \ln N proposed by Blas, Pujol\'as and Sibiryakov. We show that the algebra of constraints closes. The "Hamiltonian" constraint is of second-class behavior and it can be solved consistently for N. The preservation in time of this constraint yields an equation that can be consistently solved for a Lagrange multiplier of the theory. The model has six propagating degrees of freedom in the phase space, corresponding to three even physical modes. When compared with the \lambda R-model previously studied by us, it lacks two second-class constraints, which leads to the extra even mode. \\ ( http://arxiv.org/abs/1106.5766 , 11kb) %-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%- ------------------------------------------------------------------------------ \\ arXiv:1103.2016 (*cross-listing*) Date: Thu, 10 Mar 2011 12:37:29 GMT (39kb) Date (revised v2): Tue, 28 Jun 2011 13:12:16 GMT (40kb) Title: Toward physical cosmology: focus on inhomogeneous geometry and its non-perturbative effects Authors: Thomas Buchert Categories: gr-qc astro-ph.CO hep-th Comments: 34 pages; invited review for Classical and Quantum Gravity Focus Section "Inhomogeneous Cosmological Models and Averaging in Cosmology", to appear \\ We outline the key-steps toward the construction of a physical, fully relativistic cosmology. The influence of inhomogeneities on the effective evolution history of the Universe is encoded in backreaction terms and expressed through spatially averaged geometrical invariants. These are absent and potential candidates for the missing dark sources in the standard model. Since they can be interpreted as energies of an emerging scalar field (the morphon), we are in the position to propose a strategy of how phenomenological scalar field models for Dark Energy, Dark Matter and Inflation, that are usually added as fundamental sources to a homogeneous-geometry (FLRW) cosmology, can be potentially traced back to inhomogeneous geometrical properties of space and its embedding into spacetime. We lay down a line of arguments that is - thus far only qualitatively - conclusive, and we address open problems of quantitative nature, related to the interpretation of observations. We discuss within a covariant framework ... [abridged] \\ ( http://arxiv.org/abs/1103.2016 , 40kb) ------------------------------------------------------------------------------ \\ arXiv:1106.5292 (*cross-listing*) Date: Mon, 27 Jun 2011 04:40:21 GMT (8kb) Date (revised v2): Tue, 28 Jun 2011 12:27:19 GMT (9kb) Title: Einstein frame and Jordan frame revisited: are they mathematically equivalent? Authors: Wei Xu and Liu Zhao Categories: gr-qc hep-th Comments: 9 pages. v2: typos, minor corrections and new references \\ We show that the Einstein and Jordan frames of general relativity are mathematically inequivalent. \\ ( http://arxiv.org/abs/1106.5292 , 9kb) ------------------------------------------------------------------------------ \\ arXiv:1106.5422 (*cross-listing*) Date: Mon, 27 Jun 2011 15:44:37 GMT (10kb) Title: Leptophobic Z' in Heterotic-String Derived Models Authors: Alon E. Faraggi and Viraf M. Mehta Categories: hep-ph hep-th Comments: 10 pages. Standard LaTex Report-no: LTH-917 \\ The CDF collaboration's recent observation of an excess of events in the Wjj channel may be attributed to a new Abelian vector boson with suppressed couplings to leptons. While D0 finds no evidence of an excess, the CDF data provide an opportunity to revisit an old result on leptophobic Z' in heterotic-string derived models. We re-examine the conditions for the existence of a leptophobic U(1) symmetry, which arises from a combination of the U(1)_{B-L} symmetry and the horizontal flavour symmetries, to form a universal U(1) symmetry. While the conditions for the existence of a leptophobic combination are not generic, we show that the left-right symmetric free fermionic heterotic-string models also admit a leptophobic combination. In some cases the leptophobic U(1) is augmented by the enhancement of the colour group, along the lines of models proposed by Foot and Hernandez. \\ ( http://arxiv.org/abs/1106.5422 , 10kb) ------------------------------------------------------------------------------ \\ arXiv:1106.5507 (*cross-listing*) Date: Mon, 27 Jun 2011 20:01:47 GMT (431kb,D) Title: Galaxy Bias and non-Linear Structure Formation in General Relativity Authors: Tobias Baldauf, Uros Seljak, Leonardo Senatore and Matias Zaldarriaga Categories: astro-ph.CO gr-qc hep-th Comments: 48 pages, 4 figures \\ Length scales probed by large scale structure surveys are becoming closer to the horizon scale. Further, it has been recently understood that non-Gaussianity in the initial conditions could show up in a scale dependence of the bias of galaxies at the largest distances. It is therefore important to include General Relativistic effects. Here we provide a General Relativistic generalization of the bias, valid both for Gaussian and non-Gaussian initial conditions. The collapse of objects happens on very small scales, while long-wavelength modes are always in the quasi linear regime. Around every collapsing region, it is therefore possible to find a reference frame that is valid for all times and where the space time is almost flat: the Fermi frame. Here the Newtonian approximation is applicable and the equations of motion are the ones of the N-body codes. The effects of long-wavelength modes are encoded in the mapping from the cosmological frame to the local frame. For the linear bias, the effect of the long-wavelength modes on the dynamics is encoded in the local curvature of the Universe, which allows us to define a General Relativistic generalization of the bias in the standard Newtonian setting. We show that the bias due to this effect goes to zero as the squared ratio of the physical wavenumber with the Hubble scale for modes longer than the horizon, as modes longer than the horizon have no dynamical effects. However, the bias due to non-Gaussianities does not need to vanish for modes longer than the Hubble scale, and for non-Gaussianities of the local kind it goes to a constant. As a further application, we show that it is not necessary to perform large N-body simulations to extract information on long-wavelength modes: N-body simulations can be done on small scales and long-wavelength modes are encoded simply by adding curvature to the simulation and rescaling the coordinates. \\ ( http://arxiv.org/abs/1106.5507 , 431kb) ------------------------------------------------------------------------------ \\ arXiv:1106.5528 (*cross-listing*) Date: Mon, 27 Jun 2011 21:44:28 GMT (75kb,D) Title: Schwinger-Dyson equations and disorder Authors: Adam P. Szczepaniak, Hugo Reinhardt Categories: hep-ph hep-th Comments: 7 pages, 6 figures \\ Using simple models in D=0+0 and D=0+1 dimensions we construct partition functions and compute two-point correlations. The exact result is compared with saddle-point approximation and solutions of Schwinger-Dyson equations. When integrals are dominated by more than one saddle-point we find Schwinger-Dyson equations do not reproduce the correct results unless the action is first transformed into dual variables. \\ ( http://arxiv.org/abs/1106.5528 , 75kb) ------------------------------------------------------------------------------ \\ arXiv:1106.5537 (*cross-listing*) Date: Mon, 27 Jun 2011 22:46:59 GMT (27kb) Title: Metamorphosis versus Decoupling in Nonabelian Gauge Theories at Very High Energies Authors: Ruggero Ferrari (CTP-MIT University of Milan, INFN Milan) Categories: hep-ph hep-lat hep-th Comments: Article, 30 pages Report-no: MIT-CTP 4275, IFUM-977-FT, June, 2011 \\ In the present paper we study the limit of zero mass in nonabelian gauge theories both with Higgs mechanism and in the nonlinear realization of the gauge group (Stueckelberg mass). We argue that in the first case the longitudinal modes undergo a metamorphosis process to the Goldstone scalar modes, while in the second we guess a decoupling process associated to a phase transformation. The two scenarios yield strikingly different behaviors at high energy, mainly ascribed to the presence of a massless Higgs doublet among the physical modes in the case of Higgs mechanism (i.e. not only the Higgs boson). The aim of this work is to show that the problem of unitarity at high energy in nonabelian gauge theory with no Higgs boson can open new perspectives in quantum field theory. \\ ( http://arxiv.org/abs/1106.5537 , 27kb) ------------------------------------------------------------------------------ \\ arXiv:1106.5538 (*cross-listing*) Date: Mon, 27 Jun 2011 22:50:13 GMT (377kb) Title: Large-N reduction in QCD with two adjoint Dirac fermions Authors: Barak Bringoltz, Mateusz Koren and Stephen R. Sharpe Categories: hep-lat hep-th Comments: 58 pages, 28 figures \\ We use lattice simulations to study the single-site version of SU(N) lattice gauge theory with two flavors of Wilson-Dirac fermions in the adjoint representation, a theory whose large volume correspondent is expected to be conformal or nearly conformal. Working with N as large as 53, we map out the phase diagram in the plane of bare `t Hooft coupling, g^2 N, and of the lattice quark mass, a*m, and look for the region where the Z_N^4 center symmetry of the theory is intact. In this region one expects the large-N equivalence of the single site and infinite volume theories to be valid. As for the N_f=1 case (see Phys. Rev. D80: 065031), we find that the center-symmetric region is large and includes both light fermion masses and masses at the cutoff scale. We study the N-dependence of the width of this region and, while we cannot rule out that it shrinks to zero at infinite N, the bulk of the evidence suggests that it remains of finite width. Simulating with couplings as small as g^2 N = 0.005, we find that the width shrinks slowly with decreasing g^2 N, at a rate consistent with analytic arguments. Within the center-symmetric region our results for the phase structure, when extrapolated to infinite N, apply also for the large volume theory, which is minimal walking technicolor with N=infinity. We find a first-order transition as a function of a*m for all values of b, which we argue favors that the theory is confining in the infrared. Our results for the average plaquette prefer a linear dependence on 1/N, rather than the expected quadratic form, and we discuss a possible explanation for this. Finally, we measure the eigenvalue densities of the Wilson-Dirac operator and its hermitian version, and use large Wilson loops to study the utility of reduction for extracting physical observables. \\ ( http://arxiv.org/abs/1106.5538 , 377kb) ------------------------------------------------------------------------------ \\ arXiv:1106.5543 (*cross-listing*) Date: Tue, 28 Jun 2011 00:25:27 GMT (10kb) Title: General Relativity and Weyl Frames Authors: C. Romero, J. B. Fonseca-Neto and M. L. Pucheu Categories: gr-qc hep-th Comments: Talk presented at the 8th Alexander Friedmann International Seminar on General Relativity and Gravitation (Rio de Janeiro - 2011) \\ We present the general theory of relativity in the language of a non-Riemannian geometry, namely, Weyl geometry. We show that the new mathematical formalism may lead to different pictures of the same gravitational phenomena, by making use of the concept of Weyl frames. We show that, in this formalism, it is possible to construct a scalar-tensor gravitational theory that is invariant with respect to the so-called Weyl tranformations and reduces to general relativity in a particular frame, the Riemann frame. In this approach the Weyl geometry plays a fundamental role since it appears as the natural geometrical setting of the theory when viewed in an arbitrary frame. Our starting point is to build an action that is manifestly invariant with respect to Weyl transformations. When this action is expressed in more familiar terms of Riemannian geometry we find that the theory has some similarities with Brans-Dicke theory of gravity. We illustrate this point with an example in which a known Brans-Dicke vacuum solution may appear when reinterpreted in a particular Weyl frame. \\ ( http://arxiv.org/abs/1106.5543 , 10kb) ------------------------------------------------------------------------------ \\ arXiv:1106.5575 (*cross-listing*) Date: Tue, 28 Jun 2011 06:51:32 GMT (31kb) Title: Hadamard States for the Vector Potential on Asymptotically Flat Spacetimes Authors: Claudio Dappiaggi and Daniel Siemssen Categories: gr-qc hep-th math-ph math.MP Comments: 26 pages MSC-class: 81T05, 81T20 \\ We develop a quantization scheme for the vector potential on globally hyperbolic spacetimes which realizes it as a locally covariant conformal quantum field theory. This result allows us to employ on a large class of backgrounds, which are asymptotically flat at null infinity, a bulk-to-boundary correspondence procedure in order to identify for the underlying field algebra a distinguished ground state which is of Hadamard form. \\ ( http://arxiv.org/abs/1106.5575 , 31kb) ------------------------------------------------------------------------------ \\ arXiv:1106.5585 (*cross-listing*) Date: Tue, 28 Jun 2011 08:09:12 GMT (741kb,D) Title: Nonperturbative renormalization-group approach to strongly-correlated lattice bosons Authors: A. Rancon and N. Dupuis Categories: cond-mat.quant-gas hep-th Comments: 27 pages, 30 figures \\ We present a nonperturbative renormalization-group approach to the Bose-Hubbard model. By taking as initial condition of the renormalization-group flow the (local) limit of decoupled sites, we take into account both local and long-distance fluctuations in a nontrivial way. This approach yields a phase diagram in very good quantitative agreement with quantum Monte Carlo simulations, and reproduces the two universality classes of the superfluid--Mott-insulator transition. The critical behavior near the multicritical points, where the transition takes place at constant density, agrees with the original predictions of Fisher {\it et al.} [Phys. Rev. B {\bf 40}, 546 (1989)] based on simple scaling arguments. At a generic transition point, the critical behavior is mean-field like with logarithmic corrections in two dimensions. In the weakly-correlated superfluid phase (far away from the Mott insulating phase), the renormalization-group flow is controlled by the Bogoliubov fixed point down to a characteristic (Ginzburg) momentum scale $k_G$ which is much smaller than the inverse healing length $k_h$. In the vicinity of the multicritical points, when the density is commensurate, we identify a sharp crossover from a weakly- to a strongly-correlated superfluid phase where the condensate density and the superfluid stiffness are strongly suppressed and both $k_G$ and $k_h$ are of the order of the inverse lattice spacing. \\ ( http://arxiv.org/abs/1106.5585 , 741kb) ------------------------------------------------------------------------------ \\ arXiv:1106.5624 (*cross-listing*) Date: Tue, 28 Jun 2011 10:59:44 GMT (2843kb) Title: Renormalization Group and Curved Spacetime Authors: Hiroaki Matsueda Categories: cond-mat.stat-mech hep-th Comments: 4 pages, 5 figures \\ We examine the role of curved geometry on renormalization group by means of image compression based on the singular value decomposition. By calculating course-grained images and their entanglement entropy, we find the anti-de Sitter space / conformal field theory correspondence hidden in the compression. The correspondence is originated from the conservation law for information. We discuss how one particular metric is automatically induced from various images. A formula for resolution of the course-grained images is also derived. \\ ( http://arxiv.org/abs/1106.5624 , 2843kb) ------------------------------------------------------------------------------ \\ arXiv:1106.5638 (*cross-listing*) Date: Tue, 28 Jun 2011 12:15:41 GMT (391kb) Title: Naked Singularity Formation In f(R) Gravity Authors: A. H. Ziaie, K. Atazadeh, S. M. M. Rasouli Categories: gr-qc hep-th Comments: 15 pages, 4 figures, to appear in GRG \\ We study the gravitational collapse of a star with barotropic equation of state $p=w\rho$ in the context of $f({\mathcal R})$ theories of gravity. Utilizing the metric formalism, we rewrite the field equations as those of Brans-Dicke theory with vanishing coupling parameter. By choosing the functionality of Ricci scalar as $f({\mathcal R})=\alpha{\mathcal R}^{m}$, we show that for an appropriate initial value of the energy density, if $\alpha$ and $m$ satisfy certain conditions, the resulting singularity would be naked, violating the cosmic censorship conjecture. These conditions are the ratio of the mass function to the area radius of the collapsing ball, negativity of the effective pressure, and the time behavior of the Kretschmann scalar. Also, as long as parameter $\alpha$ obeys certain conditions, the satisfaction of the weak energy condition is guaranteed by the collapsing configuration. \\ ( http://arxiv.org/abs/1106.5638 , 391kb) ------------------------------------------------------------------------------ \\ arXiv:1106.5658 (*cross-listing*) Date: Tue, 28 Jun 2011 13:34:08 GMT (1206kb) Title: Probing the dynamics of dark energy with divergence-free parametrizations: A global fit study Authors: Hong Li, Xin Zhang Categories: astro-ph.CO gr-qc hep-ph hep-th Comments: 6 pages, 2 figures \\ The CPL parametrization has a problem that the equation of state $w(z)$ diverges in the far future, so that this model can only properly describe the past evolution but cannot depict the future evolution. To overcome such a difficulty, in a recent paper [J.Z. Ma and X. Zhang, Phys.\ Lett.\ B {\bf 699}, 233 (2011)], a robust, novel parametrization for dark energy, $w(z)=w_0+w_1({\ln (2+z)\over 1+z}-\ln2)$, has been proposed, successfully avoiding the future divergence problem in the CPL parametrization. On the other hand, an oscillating parametrization (motivated by an oscillating quintom model) can also avoid the future divergence problem. In this paper, we use the two divergence-free parametrizations to probe the dynamics of dark energy in the whole evolutionary history. In light of the data from 7-year WMAP temperature and polarization power spectra, matter power spectrum of SDSS DR7, and SN Ia Union2 sample, we perform a full Markov Chain Monte Carlo exploration for the two dynamical dark energy models. We find that the best-fit dark energy model is a quintom model with the EOS across -1 during the evolution. However, though the quintom model is more favored, we find that the cosmological constant still cannot be excluded. \\ ( http://arxiv.org/abs/1106.5658 , 1206kb) ------------------------------------------------------------------------------ \\ arXiv:1106.5662 (*cross-listing*) Date: Tue, 28 Jun 2011 13:47:35 GMT (1830kb) Title: Dark Matter May be Strongly Visible in UHE Cosmic Rays and Related New Physics May be Appearing at the LHC Authors: Alan. R. White Categories: hep-ph hep-th \\ A two flavor color sextet quark sector added to QCD yields the {\it uniquely} unitary Critical Pomeron at high energy while also producing electroweak symmetry breaking. In this paper it is argued that a number of experimental phenomena in Cosmic Ray and hadron collider physics can be interpreted as evidence for the sextet sector, as follows. 1. The majority of UHE cosmic rays are Dark Matter sextet neutrons. 2. The cosmic ray spectrum knee is a production threshold for sextet states. 3. The enhancement of high multiplicities and small pT at the LHC is related to a sextet generated triple pomeron coupling. 4. Tevatron and LHC events containing a Z pair and a high multiplicity of small pT particles are associated with sextet electroweak symmetry breaking. 5. Top quark production is via the $\eta_6$ sextet quark pseudoscalar resonance - interference with the background will produce an asymmetry. 6. Enhanced W pair production would produce an excess in the W + dijet cross-section. Combining the sextet sector and the electroweak interaction, without introducing short-distance anomalies, requires a unique underlying massless SU(5) theory that plays an essential role in the dynamics. A multi-regge construction implies this theory has a massive bound-state S-Matrix in which interactions are strongly enhanced by infra-red divergent wee gluons that couple via anomalies due to massless fermion chirality transitions. The S-Matrix could reproduce the full Standard Model with, the production of the additional sextet states particularly strongly enhanced. \\ ( http://arxiv.org/abs/1106.5662 , 1830kb) ------------------------------------------------------------------------------ \\ arXiv:1106.5709 (*cross-listing*) Date: Tue, 28 Jun 2011 15:39:09 GMT (16kb) Title: Ultralocal energy density in massive gravity Authors: V.O. Soloviev, M.V. Tchichikina Categories: gr-qc hep-th Comments: 17 pages, no figures, LaTeX MSC-class: 83 \\ We provide a space-time covariant Hamiltonian treatment for a finite-range gravitational theory. The Kuchar approach is used to demonstrate the bimetric picture of space-time in its most transparent form. This Hamiltonian formalism is applied for the straightforward realization of the Poincar\'e algebra in Dirac brackets. It uncovers the simplest form of the Poincar\'e generators expressed as spatial integrals of ultralocal quantities constructed pure algebraically by means of the two space-time metrics. \\ ( http://arxiv.org/abs/1106.5709 , 16kb) ------------------------------------------------------------------------------ \\ arXiv:1106.5750 (*cross-listing*) Date: Tue, 28 Jun 2011 18:15:23 GMT (12kb) Title: Global well-posedness and scattering for Skyrme wave maps Authors: Dan-Andrei Geba, Kenji Nakanishi, and Sarada G. Rajeev Categories: math.AP hep-th math-ph math.MP Comments: 12 pages MSC-class: 35L70, 81T13 \\ We study equivariant maps corresponding to the classical Skyrme model and the Adkins-Nappi model, for which we prove global existence and scattering in critical Sobolev-Besov spaces. \\ ( http://arxiv.org/abs/1106.5750 , 12kb) %%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%% ------------------------------------------------------------------------------ \\ arXiv:1010.3834 (*cross-listing*) replaced with revised version Tue, 28 Jun 2011 02:03:00 GMT (6338kb) Title: Generation of a bubble universe using a negative energy bath Authors: Dong-il Hwang, Dong-han Yeom Categories: gr-qc hep-th Comments: 36 pages, 20 figures Journal-ref: Class.Quant.Grav.28:155003,2011 \\ ( http://arxiv.org/abs/1010.3834 , 6338kb) ------------------------------------------------------------------------------ \\ arXiv:1011.1474 replaced with revised version Tue, 28 Jun 2011 14:46:33 GMT (48kb) Title: Holographic description of large N gauge theory Authors: Sung-Sik Lee Categories: hep-th cond-mat.str-el hep-lat Comments: 23 pages, 11 figures; v4) published version; typo corrected Journal-ref: Nucl. Phys. B 851, 143 (2011) DOI: 10.1016/j.nuclphysb.2011.05.011 \\ ( http://arxiv.org/abs/1011.1474 , 48kb) ------------------------------------------------------------------------------ \\ arXiv:1012.2079 replaced with revised version Tue, 28 Jun 2011 17:45:49 GMT (31kb) Title: 6d conformal gravity Authors: R.R. Metsaev Categories: hep-th Comments: 31 pages, LaTeX-2e, v3: Footnotes 8,9,13, clarifying remark below Eq.(2.30), and references added. Misprints corrected Report-no: FIAN-TD-2010-14 \\ ( http://arxiv.org/abs/1012.2079 , 31kb) ------------------------------------------------------------------------------ \\ arXiv:1102.5100 (*cross-listing*) replaced with revised version Mon, 27 Jun 2011 20:33:09 GMT (27kb,D) Title: The Standard Model is Natural as Magnetic Gauge Theory Authors: Francesco Sannino (CP3-Origins) Categories: hep-ph hep-th Comments: RevTeX, 5 pages. Version to match the published one. Added several paragraphs suggesting how nonsupersymmetric gauge-gauge duality can work. This work opens the doors to a new way to address the hierarchy problem of the Standard Model Report-no: CP3-Origins-2011-07 \\ ( http://arxiv.org/abs/1102.5100 , 27kb) ------------------------------------------------------------------------------ \\ arXiv:1103.1703 (*cross-listing*) replaced with revised version Tue, 28 Jun 2011 03:54:42 GMT (18kb) Title: Kaluza-Klein brane cosmology with a bulk scalar field Authors: Arianto, F.P. Zen, S. Feranie, I P. Widyatmika, and B.E. Gunara Categories: gr-qc hep-ph hep-th Comments: 11 pages, one section added, accepted for publication in PRD \\ ( http://arxiv.org/abs/1103.1703 , 18kb) ------------------------------------------------------------------------------ \\ arXiv:1103.2136 replaced with revised version Tue, 28 Jun 2011 18:22:08 GMT (29kb) Title: Double Field Theory Formulation of Heterotic Strings Authors: Olaf Hohm, Seung Ki Kwak Categories: hep-th Comments: 28 pages, v2: minor changes, version published in JHEP Report-no: MIT-CTP-4223 Journal-ref: JHEP 1106:096,2011 DOI: 10.1007/JHEP06(2011)096 \\ ( http://arxiv.org/abs/1103.2136 , 29kb) ------------------------------------------------------------------------------ \\ arXiv:1104.3188 replaced with revised version Tue, 28 Jun 2011 13:12:51 GMT (204kb) Title: Domain wall brane in squared curvature gravity Authors: Yu-Xiao Liu, Yuan Zhong, Zhen-Hua Zhao and Hai-Tao Li Categories: hep-th gr-qc Comments: 18 pages, 5 figures and 1 table, references added, improved version to be published in JHEP \\ ( http://arxiv.org/abs/1104.3188 , 204kb) ------------------------------------------------------------------------------ \\ arXiv:1105.0508 (*cross-listing*) replaced with revised version Tue, 28 Jun 2011 02:13:33 GMT (42kb) Title: Exactly Solvable Quantum Mechanics and Infinite Families of Multi-indexed Orthogonal Polynomials Authors: Satoru Odake and Ryu Sasaki Categories: math-ph hep-th math.CA math.MP nlin.SI quant-ph Comments: 7 pages, 1 figure. Comments and references added. Typo corrected(4,5 lines below eq.(5)). To appear in Phys.Lett.B Report-no: DPSU-11-4, YITP-11-52 \\ ( http://arxiv.org/abs/1105.0508 , 42kb) ------------------------------------------------------------------------------ \\ arXiv:1105.2836 replaced with revised version Mon, 27 Jun 2011 20:37:09 GMT (189kb) Title: Critical values of the Yang-Yang functional in the quantum sine-Gordon model Authors: Sergei Lukyanov Categories: hep-th Comments: 36 pages, 7 figures Report-no: RU-NHETC-2011-9 \\ ( http://arxiv.org/abs/1105.2836 , 189kb) ------------------------------------------------------------------------------ \\ arXiv:1106.1760 replaced with revised version Tue, 28 Jun 2011 08:58:07 GMT (35kb) Title: The general gaugings of maximal d=9 supergravity Authors: JJ Fernandez-Melgarejo, T. Ortin, E. Torrente-Lujan Categories: hep-th Comments: Latex file, 43 pages, reference added Report-no: IFT-UAM/CSIC-11-18, UM-TH/11-09 \\ ( http://arxiv.org/abs/1106.1760 , 35kb) ------------------------------------------------------------------------------ \\ arXiv:1106.1891 (*cross-listing*) replaced with revised version Tue, 28 Jun 2011 09:53:10 GMT (236kb) Title: Beauty is Distractive: Particle production during multifield inflation Authors: Diana Battefeld, Thorsten Battefeld, Christian Byrnes, David Langlois Categories: astro-ph.CO gr-qc hep-th Comments: 41 pages, 6 figures; v2: references and minor clarifications added, conclusions unchanged \\ ( http://arxiv.org/abs/1106.1891 , 236kb) ------------------------------------------------------------------------------ \\ arXiv:1106.2188 replaced with revised version Tue, 28 Jun 2011 01:22:22 GMT (244kb,D) Title: Chain Inflation Reconsidered Authors: James M. Cline, Guy D. Moore, Yi Wang Categories: hep-th astro-ph.CO hep-ph Comments: 15 pages, 6 figures; added references, fixed minor typos \\ ( http://arxiv.org/abs/1106.2188 , 244kb) ------------------------------------------------------------------------------ \\ arXiv:1106.3548 replaced with revised version Tue, 28 Jun 2011 01:22:48 GMT (11kb) Title: Emergence of Superstring from Pure Spinor Authors: Ichiro Oda Categories: hep-th Comments: 9 pages Report-no: DPUR/TH/25 \\ ( http://arxiv.org/abs/1106.3548 , 11kb) ------------------------------------------------------------------------------ \\ arXiv:1106.3999 (*cross-listing*) replaced with revised version Tue, 28 Jun 2011 09:24:18 GMT (54kb) Title: Disentangling non-Gaussianity, bias and GR effects in the galaxy distribution Authors: Marco Bruni (ICG, Portsmouth), Robert Crittenden (ICG, Portsmouth), Kazuya Koyama (ICG, Portsmouth), Roy Maartens (Western Cape, ICG, Portsmouth), Cyril Pitrou (ICG, Portsmouth), David Wands (ICG, Portsmouth) Categories: astro-ph.CO gr-qc hep-ph hep-th Comments: 5 pages, 2 figures \\ ( http://arxiv.org/abs/1106.3999 , 54kb) ------------------------------------------------------------------------------ \\ arXiv:1106.4758 replaced with revised version Tue, 28 Jun 2011 19:02:09 GMT (20kb) Title: Form factors in the Bullough-Dodd related models: The Ising model in a magnetic field Authors: Oleg Alekseev Categories: hep-th Comments: 20 pages; v2: some misprints, textual inaccuracies and references corrected; some references and remarks added \\ ( http://arxiv.org/abs/1106.4758 , 20kb) ------------------------------------------------------------------------------ \\ arXiv:1106.5282 (*cross-listing*) replaced with revised version Tue, 28 Jun 2011 08:23:33 GMT (639kb) Title: Scalar Field Cosmology I: Asymptotic Freedom and the Initial-Value Problem Authors: Kerson Huang, Hwee-Boon Low, Roh-Suan Tung Categories: gr-qc hep-th Comments: 28 pages, 5 figures. v2: figures included \\ ( http://arxiv.org/abs/1106.5282 , 639kb) ------------------------------------------------------------------------------ \\ arXiv:1106.5283 (*cross-listing*) replaced with revised version Tue, 28 Jun 2011 16:32:54 GMT (862kb) Title: Scalar Field Cosmology II: Superfluidity and Quantum Turbulence Authors: Kerson Huang, Hwee-Boon Low, Roh-Suan Tung Categories: gr-qc hep-th Comments: 24 pages, 7 figures. v2: figures included \\ ( http://arxiv.org/abs/1106.5283 , 862kb) %%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%--- 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/ For a list of archive mirror sites, see http://arXiv.org/servers.html ----------------------------------------------------------------------------- Third-party submissions cause excessive problems. 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