Date: Thu, 28 Oct 10 00:06:11 GMT Subject: hep-th daily 17 new + 13 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 Tue 26 Oct 10 20:00:00 GMT to Wed 27 Oct 10 20:00:00 GMT ------------------------------------------------------------------------------ \\ arXiv:1010.5508 Date: Tue, 26 Oct 2010 20:06:56 GMT (9kb) Title: Torus Amplitudes in Minimal Liouville Gravity and Matrix Models Authors: V.Belavin Categories: hep-th Comments: 10 pages \\ We evaluate one-point correlation numbers on the torus in the Liouville theory coupled to the conformal matter M(2,2p+1). We find agreement with the recent results obtained in the matrix model approach. \\ ( http://arxiv.org/abs/1010.5508 , 9kb) ------------------------------------------------------------------------------ \\ arXiv:1010.5509 Date: Tue, 26 Oct 2010 20:10:21 GMT (71kb) Title: Toward the Gravity Dual of Heterotic Small Instantons Authors: Fang Chen, Keshav Dasgupta, Paul Franche, Radu Tatar Categories: hep-th Comments: 45 pages, 3 eps figures, LaTex, JHEP3 file \\ The question of what happens when the heterotic SO(32) instanton becomes small was answered sometime back by Witten. The heterotic theory develops an enhanced Sp(2k) gauge symmetry for k small instantons, besides the allowed SO(32) gauge symmetry. An interesting question now is to ask what happens when we take the large k limit. In this paper we argue that in some special cases, where Gauss' law allows the large k limit, the dynamics of the large k small instantons can be captured by a dual gravitational description. For the cases that we elaborate in this paper, the gravity duals are non-Kahler manifolds although in general they could be non-geometric. These small instantons are heterotic five-branes and the duality allows us to study the strongly coupled field theories on these five-branes. We review and elaborate on some of the recent observations pointing towards this duality, and argue that in certain cases the gauge/gravity duality may be understood as small instanton transitions under which the instantons smoothen out and consequently lose the Sp(2k) gauge symmetry. This may explain how branes disappear on the dual side and are replaced by fluxes. We analyse the torsion classes before and after the transitions, and discuss briefly how the ADHM sigma model and related vector bundles could be studied for these scenarios. \\ ( http://arxiv.org/abs/1010.5509 , 71kb) ------------------------------------------------------------------------------ \\ arXiv:1010.5514 Date: Tue, 26 Oct 2010 20:48:58 GMT (3878kb) Title: Quantum Fields on Causal Sets Authors: Steven Johnston Categories: hep-th gr-qc Comments: PhD Thesis, Imperial College London, September 2010 \\ Causal set theory provides a model of discrete spacetime in which spacetime events are represented by elements of a causal set---a locally finite, partially ordered set in which the partial order represents the causal relationships between events. The work presented here describes a model for matter on a causal set, specifically a theory of quantum scalar fields on a causal set spacetime background. The work starts with a discrete path integral model for particles on a causal set. Here quantum mechanical amplitudes are assigned to trajectories within the causal set. By summing these over all trajectories between two spacetime events we obtain a causal set particle propagator. With a suitable choice of amplitudes this is shown to agree (in an appropriate sense) with the retarded propagator for the Klein-Gordon equation in Minkowski spacetime. This causal set propagator is then used to define a causal set analogue of the Pauli-Jordan function that appears in continuum quantum field theories. A quantum scalar field is then modelled by an algebra of operators which satisfy three simple conditions (including a bosonic commutation rule). Defining time-ordering through a linear extension of the causal set these field operators are used to define a causal set Feynman propagator. Evidence is presented which shows agreement (in a suitable sense) between the causal set Feynman propagator and the continuum Feynman propagator for the Klein-Gordon equation in Minkowski spacetime. The Feynman propagator is obtained using the eigendecomposition of the Pauli-Jordan function, a method which can also be applied in continuum-based theories. The free field theory is extended to include interacting scalar fields. This leads to a suggestion for a non-perturbative S-matrix on a causal set. Models for continuum-based phenomenology and spin-half particles on a causal set are also presented. \\ ( http://arxiv.org/abs/1010.5514 , 3878kb) ------------------------------------------------------------------------------ \\ arXiv:1010.5515 Date: Tue, 26 Oct 2010 20:50:48 GMT (117kb,D) Title: Deconfinement in Yang-Mills theory through toroidal compactification with deformation Authors: Dusan Simic and Mithat Unsal Categories: hep-th Comments: 25 pgaes, 4 figures \\ We introduce field theory techniques through which the deconfinement transition of four-dimensional Yang-Mills theory can be moved to a semi-classical domain where it becomes calculable using two-dimensional field theory. We achieve this through a double- trace deformation of toroidally compactified Yang-Mills theory on R2 \times S1_L \times S1_{\beta}. At large N, fixed-L, and arbitrary {\beta}, the thermodynamics of the deformed theory is equivalent to that of ordinary Yang-Mills theory at leading order in the large N expansion. At fixed-N, small L and a range of {\beta}, the deformed theory maps to a two-dimensional theory with electric and magnetic (order and disorder) perturbations, analogs of which appear in planar spin-systems and statistical physics. We show that in this regime the deconfinement transition is driven by the competition between electric and magnetic perturbations in this two-dimensional theory. This appears to support the scenario proposed by Liao and Shuryak regarding the magnetic component of the quark-gluon plasma at RHIC. \\ ( http://arxiv.org/abs/1010.5515 , 117kb) ------------------------------------------------------------------------------ \\ arXiv:1010.5516 Date: Tue, 26 Oct 2010 20:50:49 GMT (12kb) Title: Diffeomorphism invariance and gauge transformations in the Horava-Lifshitz gravity Authors: F. S. Bemfica Categories: hep-th gr-qc Comments: 15 pages \\ This paper is intended to study diffeomorphism invariance and gauge transformations in the modified theory of gravity proposed by Horava. To begin with, we demonstrate that the theory does not lose diffeomorphism invariance due to the parameter $\lambda$, as it was previously believed. However, we show that the presence of terms containing the Levi-Civita symbol in the original proposal of Horava makes the theory diffeomorphism dependent. By neglecting such terms, what returns fully diffeomorphism invariance to the action, we obtain the equations of motion. Soon after, in the Hamiltonian formalism, we calculate the gauge transformations generated by the constraints of the theory. Then, we prove that all passive diffeomorphism of General Relativity are generated, on the energy shell, by the constraints of the Horava-Lifshitz gravity. \\ ( http://arxiv.org/abs/1010.5516 , 12kb) ------------------------------------------------------------------------------ \\ arXiv:1010.5531 Date: Tue, 26 Oct 2010 22:24:42 GMT (31kb) Title: Closure of the algebra of constraints for a non-projectable Ho\v{r}ava model Authors: Jorge Bellor\'in and Alvaro Restuccia Categories: hep-th gr-qc Comments: 15 pages, 1 figure \\ We perform the Hamiltonian analysis for a non-projectable Ho\v{r}ava model whose potential is composed of R and R^2 terms. We show that Dirac's algorithm for the preservation of the constraints can be done in a closed way, hence the algebra of constraints is consistent. The model has an extra, odd, scalar mode whose decoupling limit can be seen in a linear-order perturbative analysis on weakly varying backgrounds. \\ ( http://arxiv.org/abs/1010.5531 , 31kb) ------------------------------------------------------------------------------ \\ arXiv:1010.5536 Date: Tue, 26 Oct 2010 23:19:45 GMT (29kb) Title: On F-theory E_6 GUTs Authors: Ching-Ming Chen, Yu-Chieh Chung Categories: hep-th Comments: 37 pages, 17 tables Report-no: MIFPA-10-47, TUW-10-15 \\ We approach the Minimum Supersymmetric Standard Model (MSSM) from an E_6 GUT by using the spectral cover construction and non-abelian gauge fluxes in F-theory. We start with an E_6 singularity unfolded from an E_8 singularity and obtain E_6 GUTs by using an SU(3) spectral cover. By turning on SU(2) X U(1)^2 gauge fluxes, we obtain a rank 5 model with the gauge group SU(3) X SU(2) X U(1)^2. Based on the well-studied geometric backgrounds in the literature, we demonstrate several models and discuss their phenomenology. \\ ( http://arxiv.org/abs/1010.5536 , 29kb) ------------------------------------------------------------------------------ \\ arXiv:1010.5540 Date: Tue, 26 Oct 2010 23:42:10 GMT (10kb) Title: Gaugino Mass and Landscape of Vacua Authors: Yuichiro Nakai and Yutaka Ookouchi Categories: hep-th hep-ph Comments: 9 pages Report-no: YITP-10-10, IPMU-10-0188 \\ In direct gauge mediation, gaugino masses often vanish at the leading order of supersymmetry breaking. Recently, this phenomenon is understood in connection with the global structure of vacua in O'Raifeartaigh-type models. In this note, we further explore a connection between gaugino masses and the landscape of vacua in a variety of gauge mediation models. In particular, we present a calculable model with non-vanishing leading order gaugino masses on the lowest energy vacuum. \\ ( http://arxiv.org/abs/1010.5540 , 10kb) ------------------------------------------------------------------------------ \\ arXiv:1010.5556 Date: Wed, 27 Oct 2010 02:54:14 GMT (406kb) Title: Equations of State in the Brans-Dicke cosmology Authors: Hyung Won Lee and Kyoung Yee Kim and Yun Soo Myung Categories: hep-th gr-qc Comments: 23 pages, 7 figures Report-no: ij1012 \\ We investigate the Brans-Dicke (BD) theory with the potential as cosmological model to explain the present accelerating universe. In this work, we consider the BD field as a perfect fluid with the energy density and pressure in the Jordan frame. Introducing the power-law potential and the interaction with the cold dark matter, we obtain the phantom divide which is confirmed by the native and effective equation of state. Also we can describe the metric $f(R)$ gravity with an appropriate potential, which shows a future crossing of phantom divide in viable $f(R)$ gravity models when employing the native and effective equations of state. \\ ( http://arxiv.org/abs/1010.5556 , 406kb) ------------------------------------------------------------------------------ \\ arXiv:1010.5558 Date: Wed, 27 Oct 2010 02:56:47 GMT (1095kb) Title: Geometric Approach to Quantum Statistical Mechanics and Application to Casimir Energy and Friction Properties Authors: Shoichi Ichinose Categories: hep-th cond-mat.stat-mech Comments: 20 pages, 8 figures, Proceedings of ICFS2010 (2010.9.13-18, Ise-Shima, Mie, Japan) Report-no: US-10-04 \\ A geometric approach to general quantum statistical systems (including the harmonic oscillator) is presented. It is applied to Casimir energy and the dissipative system with friction. We regard the (N+1)-dimensional Euclidean {\it coordinate} system (X$^i$,$\tau$) as the quantum statistical system of N quantum (statistical) variables (X$^i$) and one {\it Euclidean time} variable ($\tau$). Introducing paths (lines or hypersurfaces) in this space (X$^i$,$\tau$), we adopt the path-integral method to quantize the mechanical system. This is a new view of (statistical) quantization of the {\it mechanical} system. The system Hamiltonian appears as the {\it area}. We show quantization is realized by the {\it minimal area principle} in the present geometric approach. When we take a {\it line} as the path, the path-integral expressions of the free energy are shown to be the ordinary ones (such as N harmonic oscillators) or their simple variation. When we take a {\it hyper-surface} as the path, the system Hamiltonian is given by the {\it area} of the {\it hyper-surface} which is defined as a {\it closed-string configuration} in the bulk space. In this case, the system becomes a O(N) non-linear model. We show the recently-proposed 5 dimensional Casimir energy (ArXiv:0801.3064,0812.1263) is valid. We apply this approach to the visco-elastic system, and present a new method using the path-integral for the calculation of the dissipative properties. \\ ( http://arxiv.org/abs/1010.5558 , 1095kb) ------------------------------------------------------------------------------ \\ arXiv:1010.5606 Date: Wed, 27 Oct 2010 08:42:52 GMT (15kb) Title: 6-loop anomalous dimension of a single impurity operator from AdS/CFT and multiple zeta values Authors: Zoltan Bajnok, Omar el Deeb Categories: hep-th Comments: 14 pages, uses bibtex Report-no: ITP-Budapest Report 648 \\ Anomalous dimension of the simplest nontrivial single impurity operator in the beta=1/2 deformed theory is determined at six loops from the AdS/CFT correspondence. L\"uscher correction is evaluated at next-to-next-to-leading order (NNLO) in terms of multiple zeta values. The result can be simplified into the products of simple zeta functions and the same form of the correction is expected for the Konishi operator at six loops, too. \\ ( http://arxiv.org/abs/1010.5606 , 15kb) ------------------------------------------------------------------------------ \\ arXiv:1010.5613 Date: Wed, 27 Oct 2010 09:10:33 GMT (745kb) Title: Sum rules, plasma frequencies and Hall phenomenology in holographic plasmas Authors: Javier Mas, Jonathan P. Shock, Javier Tarrio Categories: hep-th Comments: 25 pages, 5 figures \\ We study the AC optical and hall conductivities of Dp/Dq-branes intersections in the probe approximation and use sum-rules to study various associated transport coefficients. We determine that the presence of massive fundamental matter, as compared to massless fundamental matter described holographically by a theory with no dimensional defects, reduces the plasma frequency. We further show that this is not the case when the brane intersections include defects. We discuss in detail how to implement correctly the regularization of retarded Green's functions so that the dispersion relations are satisfied and the low energy behaviour of the system is physically realistic. \\ ( http://arxiv.org/abs/1010.5613 , 745kb) ------------------------------------------------------------------------------ \\ arXiv:1010.5617 Date: Wed, 27 Oct 2010 09:20:16 GMT (36kb) Title: Boundary finite size corrections for multiparticle states and planar AdS/CFT Authors: Zoltan Bajnok, Laszlo Palla Categories: hep-th Comments: 21 pages, uses bibtex and 22 eps figures Report-no: ITP-Budapest Report 647 \\ We propose formulas for the L\"uscher type finite size energy correction of multiparticle states on the interval and evaluate them for the simplest case in the AdS/CFT setting. By this we determine the leading wrapping correction to the anomalous dimension of the simplest determinant type operator, which corresponds to a one particle state on the Y=0 brane. \\ ( http://arxiv.org/abs/1010.5617 , 36kb) ------------------------------------------------------------------------------ \\ arXiv:1010.5627 Date: Wed, 27 Oct 2010 09:46:02 GMT (14kb) Title: Towards a quantum field theory of primitive string fields Authors: Werner Ruehl Categories: hep-th Comments: 16 pages,Latex \\ We denote generating functions of massless even higher spin fields "primitive string fields" (PSF's). In an introduction we present the necessary definitions and derive propagators and currents of these PDF's on flat space. Their off-shell cubic interaction can be derived after all off-shell cubic interactions of triplets of higher spin fields have become known [2],[3]. Then we discuss four-point functions of any quartet of PSF's. In subsequent sections we exploit the fact that higher spin field theories in $AdS_{d+1}$ are determined by AdS/CFT correspondence from universality classes of critical systems in $d$ dimensional flat spaces. The O(N) invariant sectors of the O(N) vector models for $1\leq N \leq \infty$ play for us the role of "standard models", for varying $N$, they contain e.g. the Ising model for N=1 and the spherical model for $N=\infty$. A formula for the masses squared that break gauge symmetry for these O(N) classes is presented for d = 3. For the PSF on $AdS$ space it is shown that it can be derived by lifting the PSF on flat space by a simple kernel which contains the sum over all spins. Finally we use an algorithm to derive all symmetric tensor higher spin fields. They arise from monomials of scalar fields by derivation and selection of conformal (quasiprimary) fields. Typically one monomial produces a multiplet of spin $s$ conformal higher spin fields for all $s \geq 4$, they are distinguished by their anomalous dimensions (in $CFT_3$) or by their mass (in $AdS_4$). We sum over these multiplets and the spins to obtain "string type fields", one for each such monomial. \\ ( http://arxiv.org/abs/1010.5627 , 14kb) ------------------------------------------------------------------------------ \\ arXiv:1010.5655 Date: Wed, 27 Oct 2010 11:41:02 GMT (347kb) Title: A slice of AdS_5 as the large N limit of Seiberg duality Authors: Steven Abel and Tony Gherghetta Categories: hep-th hep-ph Comments: 47 Pages, axodraw4j.sty Report-no: IPPP/10/86, DCPT/10/172, CERN-PH-TH/2010-234 \\ A slice of AdS_5 is used to provide a 5D gravitational description of 4D strongly-coupled Seiberg dual gauge theories. An (electric) SU(N) gauge theory in the conformal window at large N is described by the 5D bulk, while its weakly coupled (magnetic) dual is confined to the IR brane. This framework can be used to construct an N = 1 MSSM on the IR brane, reminiscent of the original Randall-Sundrum model. In addition, we use our framework to study strongly-coupled scenarios of supersymmetry breaking mediated by gauge forces. This leads to a unified scenario that connects the extra-ordinary gauge mediation limit to the gaugino mediation limit in warped space. \\ ( http://arxiv.org/abs/1010.5655 , 347kb) ------------------------------------------------------------------------------ \\ arXiv:1010.5748 Date: Wed, 27 Oct 2010 17:22:13 GMT (158kb) Title: Correlated stability conjecture revisited Authors: A.Buchel, C.Pagnutti Categories: hep-th Comments: 12 pages, 4 figures Report-no: UWO-TH-10/8 \\ Correlated stability conjecture (CSC) proposed by Gubser and Mitra [1,2] linked the thermodynamic and classical (in)stabilities of black branes. The classical instabilities, whenever occurring, were conjectured to arise as Gregory-Laflamme (GL) instabilities of translationally invariant horizons. In [3] it was shown that the thermodynamic instabilities, specifically the negative specific heat, indeed result in the instabilities in the hydrodynamic spectrum of holographically dual plasma excitations. A counter-example of CSC was presented in the context of black branes with scalar hair undergoing a second-order phase transition [4]. In this paper we discuss a related counter-example of CSC conjecture, where a thermodynamically stable translationally invariant horizon has a genuine tachyonic instability. We study the spectrum of quasinormal excitations of a black brane undergoing a continuous phase transition, and explicitly identify the instability. We compute the critical exponents of the critical momenta and the frequency of the unstable fluctuations and identify the dynamical critical exponent of the model. \\ ( http://arxiv.org/abs/1010.5748 , 158kb) ------------------------------------------------------------------------------ \\ arXiv:1010.5777 Date: Wed, 27 Oct 2010 19:52:25 GMT (412kb) Title: Type IIB Holographic Superfluid Flows Authors: Daniel Arean, Matteo Bertolini, Chethan Krishnan, Tomas Prochazka Categories: hep-th Comments: 21 pages, 6 figures \\ We construct fully backreacted holographic superfluid flow solutions in a five-dimensional theory that arises as a consistent truncation of low energy type IIB string theory. We construct a black hole with scalar and vector hair in this theory, and study the phase diagram. As expected, the superfluid phase ceases to exist for high enough superfluid velocity, but we show that the phase transition between normal and superfluid phases is always second order. We also analyze the zero temperature limit of these solutions. Interestingly, we find evidence that the emergent IR conformal symmetry of the zero-temperature domain wall is broken at high enough velocity. \\ ( http://arxiv.org/abs/1010.5777 , 412kb) %-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%- ------------------------------------------------------------------------------ \\ arXiv:0910.1607 (*cross-listing*) Date: Fri, 9 Oct 2009 16:12:18 GMT (229kb,D) Date (revised v2): Mon, 12 Jul 2010 19:40:23 GMT (354kb,D) Date (revised v3): Wed, 27 Oct 2010 15:08:56 GMT (398kb,D) Title: Type-1.5 Superconducting State from an Intrinsic Proximity Effect in Two-Band Superconductors Authors: Egor Babaev, Johan Carlstrom, Martin Speight Categories: cond-mat.supr-con hep-ph hep-th Comments: Replaced with published version. Typos in the table of parameters in Fig. 4 are corrected Journal-ref: Phys. Rev. Lett. 105, 067003 (2010) DOI: 10.1103/PhysRevLett.105.067003 \\ We show that in multiband superconductors even small interband proximity effect can lead to a qualitative change in the interaction potential between superconducting vortices by producing long-range intervortex attraction. This type of vortex interaction results in unusual response to low magnetic fields leading to phase separation into domains of a two-component Meissner states and vortex droplets. \\ ( http://arxiv.org/abs/0910.1607 , 398kb) ------------------------------------------------------------------------------ \\ arXiv:1008.2254 (*cross-listing*) Date: Fri, 13 Aug 2010 06:25:21 GMT (12kb) Date (revised v2): Wed, 27 Oct 2010 12:59:46 GMT (14kb) Title: F-theory GUTs with extra charged matter Authors: Jacek Pawelczyk Categories: hep-ph hep-th Comments: 13 pages, Latex, expanded discussion of all Dirac neutrino scenerios \\ We consider local F-theory GUT models constructed recently. We show that after switching on vevs to scalars the extra matter becomes messengers. We discuss conditions on these vevs under which the models do not lead to unacceptable baryon/lepton number violating processes. \\ ( http://arxiv.org/abs/1008.2254 , 14kb) ------------------------------------------------------------------------------ \\ arXiv:1010.2626 (*cross-listing*) Date: Wed, 13 Oct 2010 10:49:42 GMT (215kb,D) Date (revised v2): Wed, 27 Oct 2010 09:29:47 GMT (101kb) Title: Why do we observe a weak force? The hierarchy problem in the multiverse Authors: Oram Gedalia, Alejandro Jenkins and Gilad Perez Categories: hep-ph hep-th Comments: 4 pages, 1 figure. Minor modifications, reference added \\ Unless the scale of electroweak symmetry breaking is stabilized dynamically, most of the universes in a multiverse theory will lack an observable weak nuclear interaction. Such "weakless universes" could support intelligent life based on organic chemistry, as long as other parameters are properly adjusted. By taking into account the seemingly-unrelated flavor dynamics that address the hierarchy of quark masses and mixings, we show that such weakless (but hospitable) universes can be far more common than universes like ours. The gauge hierarchy problem therefore calls for a dynamical (rather than anthropic) solution. \\ ( http://arxiv.org/abs/1010.2626 , 101kb) ------------------------------------------------------------------------------ \\ arXiv:1010.5507 (*cross-listing*) Date: Tue, 26 Oct 2010 20:05:30 GMT (959kb) Title: Nongaussianity from Particle Production During Inflation Authors: Neil Barnaby Categories: astro-ph.CO hep-th Comments: 53 pages, 15 figures. Invited review article, published in Advances in Astronomy Journal-ref: Advances in Astronomy, Volume 2010 (2010), Article ID 156180 DOI: 10.1155/2010/156180 \\ In a variety of models the motion of the inflaton may trigger the production of some non-inflaton particles during inflation, for example via parametric resonance or a phase transition. Such models have attracted interest recently for a variety of reasons, including the possibility of slowing the motion of the inflaton on a steep potential. In this review we show that interactions between the produced particles and the inflaton condensate can lead to a qualitatively new mechanism for generating cosmological fluctuations from inflation. We illustrate this effect using a simple prototype model g^2 (\phi-\phi_0)^2\chi^2 for the interaction between the inflaton, \phi, and iso-inflaton, \chi. Such interactions are quite natural in a variety of inflation models from supersymmetry and string theory. Using both lattice field theory simulations and analytical calculations, we study the quantum production of \chi particles and their subsequent rescatterings off the condensate \phi(t), which generates bremsstrahlung radiation of light inflaton fluctuations \delta\phi. This mechanism leads to observable features in the primordial power spectrum. We derive observational constraints on such features and discuss their implications for popular models of inflation, including brane/axion monodromy. Inflationary particle production also leads to a very novel kind of nongaussian signature which may be observable in future missions. We argue that this mechanism provides a simple and well-motivated option to generate large nongaussianity, without fine-tuning the inflationary trajectory or appealing to re-summation of an infinite series of high dimension operators. \\ ( http://arxiv.org/abs/1010.5507 , 959kb) ------------------------------------------------------------------------------ \\ arXiv:1010.5513 (*cross-listing*) Date: Tue, 26 Oct 2010 20:42:18 GMT (54kb) Title: The generalized second law forbids singularity resolution, viable baby universes, traversable wormholes, warp drives, time machines, and negative mass objects Authors: Aron C. Wall Categories: gr-qc hep-th Comments: 38 pages, 4 figures \\ The generalized second law can be used to prove a singularity theorem, by generalizing the notion of a trapped surface to quantum situations. Like Penrose's original singularity theorem, it implies that spacetime is null geodesically incomplete inside black holes, and to the past of spatially infinite Friedmann--Robertson--Walker cosmologies. If space is finite instead, the generalized second law requires that there only be a finite amount of entropy producing processes in the past, unless there is a reversal of the arrow of time. In asymptotically flat spacetime, the generalized second law also rules out traversable wormholes, negative masses, and other forms of faster-than-light travel, as well as closed timelike curves. Furthermore it is impossible to form baby universes which eventually become independent of the mother universe, or to restart inflation. Since the semiclassical approximation is used only in regions with low curvature, it is argued that the results may hold in full quantum gravity. An introductory section describes the second law and its time-reverse, in ordinary and generalized thermodynamics, using either the fine-grained or the coarse-grained entropy. A proof of the coarse-grained ordinary second law is given. \\ ( http://arxiv.org/abs/1010.5513 , 54kb) ------------------------------------------------------------------------------ \\ arXiv:1010.5519 (*cross-listing*) Date: Tue, 26 Oct 2010 20:59:49 GMT (111kb) Title: Integrability, Non-integrability and confinement Authors: Giuseppe Mussardo Categories: cond-mat.stat-mech hep-th math-ph math.MP Comments: Invited talk at StatPhys24, Cairns (Australia) 2010. 27 pages, 16 figures \\ We discuss the main features of quantum integrable models taking the classes of universality of the Ising model and the repulsive Lieb-Liniger model as paradigmatic examples. We address the breaking of integrability by means of two approaches, the Form Factor Perturbation Theory and semiclassical methods. Each of them has its own advantage. Using the first approach, one can relate the confinement phenomena of topological excitations to the semi-locality of the operator which breaks integrability. Using the second approach, one can control the bound states which arise in each phase of the theory and predict that their number cannot be more than two. \\ ( http://arxiv.org/abs/1010.5519 , 111kb) ------------------------------------------------------------------------------ \\ arXiv:1010.5523 (*cross-listing*) Date: Tue, 26 Oct 2010 21:14:47 GMT (512kb) Title: Confinement, Casimir scaling and phase transitions in G(2) gauge theories Authors: Bjoern H. Wellegehausen Categories: hep-lat hep-th Comments: 14 pages, 7 figures, XXVIII International Symposium on Lattice Field Theory 2010 \\ We present an efficient local hybrid Monte-Carlo algorithm to investigate G(2) gluodynamics with and without Higgs field in 3 and 4 dimensions. Additionaly we implemented a modified version of the multi-level L\"uscher-Weisz algorithm with exponential error reduction to measure expectation values of Wilson and Polyakov loops. In three dimensions we show that at intermediate scales the potential between static charges in the eight lowest-dimensional representations of G(2) scale with the eigenvalues of the quadratic Casimir operator. For the fundamental representations we detect string breaking for larger separations of the charges at precisely the scale predicted by the mass of the created pair of glue-lumps. In four dimensions we explored the phase diagram of the G(2) Gauge Higgs model showing that a line of first order confinement-deconfinement phase transitions connects G(2) and SU(3) gluodynamics and a line of second order phase transitions separates the two deconfinement phases. \\ ( http://arxiv.org/abs/1010.5523 , 512kb) ------------------------------------------------------------------------------ \\ arXiv:1010.5574 (*cross-listing*) Date: Wed, 27 Oct 2010 05:09:20 GMT (704kb) Title: Dirac Fermions in Inhomogeneous Magnetic Field Authors: Ahmed Jellal, Abderrahim El Mouhafid Categories: cond-mat.mes-hall hep-th math-ph math.MP Comments: 28 pages, 15 figures. Version to appear in JPA \\ We study a confined system of Dirac fermions in the presence of inhomogeneous magnetic field. Splitting the system into different regions, we determine their corresponding energy spectrum solutions. We underline their physical properties by considering the conservation energy where some interesting relations are obtained. These are used to discuss the reflexion and transmission coefficients for Dirac fermions and check the probability condition for different cases. We generalize the obtained results to a system with gap and make some analysis. After evaluating the current-carrying states, we analyze the Klein paradox and report interesting discussions. \\ ( http://arxiv.org/abs/1010.5574 , 704kb) ------------------------------------------------------------------------------ \\ arXiv:1010.5575 (*cross-listing*) Date: Wed, 27 Oct 2010 05:22:08 GMT (43kb) Title: Thermodynamics of accelerating and rotating black holes Authors: Muhammad Bilal and K. Saifullah Categories: gr-qc hep-th math-ph math.MP \\ Thermodynamics of a large family of black holes from electrovacuum solutions of Einstein's equations is studied. This family includes rotating and non-accelerating black holes with NUT charge, and rotating and accelerating black holes. The surface gravity, Hawking temperature and the area laws for these black holes are presented. The first law of thermodynamics is also given. An interesting outcome of our analysis is the restriction obtained on the magnitude of acceleration for these black holes. \\ ( http://arxiv.org/abs/1010.5575 , 43kb) ------------------------------------------------------------------------------ \\ arXiv:1010.5662 (*cross-listing*) Date: Wed, 27 Oct 2010 12:05:43 GMT (66kb) Title: Detecting and distinguishing topological defects in future data from the CMBPol satellite Authors: Pia Mukherjee, Jon Urrestilla, Martin Kunz, Andrew R. Liddle, Neil Bevis and Mark Hindmarsh Categories: astro-ph.CO hep-th Comments: 10 pages, 6 figures \\ The proposed CMBPol mission will be able to detect the imprint of topological defects on the cosmic microwave background (CMB) provided the contribution is sufficiently strong. We quantify the detection threshold for cosmic strings and for textures, and analyse the satellite's ability to distinguish between these different types of defects. We also assess the level of danger of misidentification of a defect signature as from the wrong defect type or as an effect of primordial gravitational waves. A 0.002 fractional contribution of cosmic strings to the CMB temperature spectrum at multipole ten, and similarly a 0.001 fractional contribution of textures, can be detected and correctly identified at the 3{\sigma} level. We also confirm that a tensor contribution of r = 0.0018 can be detected at over 3{\sigma}, in agreement with the CMBpol mission concept study. These results are supported by a model selection analysis. \\ ( http://arxiv.org/abs/1010.5662 , 66kb) ------------------------------------------------------------------------------ \\ arXiv:1010.5718 (*cross-listing*) Date: Wed, 27 Oct 2010 15:38:56 GMT (53kb) Title: On gauge fixing Authors: Axel Maas Categories: hep-lat hep-ph hep-th Comments: 7 pages, talk given at the "XXVIII International Symposium on Lattice Field Theory", Villasimius, Italy, June 2010. Submitted to the proceedings \\ Gauge fixing is a useful tool to simplify calculations. It is also valuable to combine different methods, in particular lattice and continuum methods. However, beyond perturbation theory the Gribov-Singer ambiguity requires further gauge conditions for a well-defined gauge-fixing prescription. Different additional conditions can, in principle, lead to different results for gauge-dependent correlation functions, as will be discussed for the example of Landau gauge. Also the relation of lattice and continuum gauge fixing beyond perturbation theory will be briefly outlined. \\ ( http://arxiv.org/abs/1010.5718 , 53kb) ------------------------------------------------------------------------------ \\ arXiv:1010.5740 (*cross-listing*) Date: Wed, 27 Oct 2010 16:49:28 GMT (17kb) Title: Kaluza-Klein models: can we construct a viable example? Authors: Maxim Eingorn and Alexander Zhuk Categories: gr-qc astro-ph.HE hep-th Comments: 10 pages, Revtex4, no figures \\ In Kaluza-Klein models, we investigate soliton solutions of Einstein equation. We obtain the formulas for perihelion shift, deflection of light, time delay of radar echoes and PPN parameters. We find that the solitonic parameter k should be very big: |k|\geq 2.3\times10^4. We define a soliton solution which corresponds to a point-like mass source. In this case the soliton parameter k=2, which is clearly contrary to this restriction. Similar problem with the observations takes place for static spherically symmetric perfect fluid with the dust-like equation of state in all dimensions. The common for both of these models is the same equations of state in our three dimensions and in the extra dimensions. All dimensions are treated at equal footing. To be in agreement with observations, it is necessary to break the symmetry between the external/our and internal spaces. It takes place for black strings which are particular examples of solitons with k\to \infty. For such k, black strings are in concordance with the observations. Moreover, we show that they are the only solitons which are at the same level of agreement with the observations as in general relativity. Black strings can be treated as perfect fluid with dust-like equation of state p_0=0 in the external/our space and very specific equation of state p_1=-(1/2)\epsilon in the internal space. The latter equation is due to negative tension in the extra dimension. We also demonstrate that dimension 3 for the external space is a special one. Only in this case we get the latter equation of state. We show that the black string equations of state satisfy the necessary condition of the internal space stabilization. Therefore, black strings are good candidates for a viable model of astrophysical objects (e.g., Sun) if we can provide a satisfactory explanation of negative tension for particles constituting these objects. \\ ( http://arxiv.org/abs/1010.5740 , 17kb) ------------------------------------------------------------------------------ \\ arXiv:1010.5766 (*cross-listing*) Date: Wed, 27 Oct 2010 19:08:39 GMT (24kb) Title: Non-gaussianities and the Stimulated creation of quanta in the inflationary universe Authors: Ivan Agullo and Leonard Parker Categories: astro-ph.CO gr-qc hep-ph hep-th Comments: 25 pages \\ Cosmological inflation generates a spectrum of density perturbations that can seed the cosmic structures we observe today. These perturbations are usually computed as the result of the gravitationally-induced spontaneous creation of perturbations from an initial vacuum state. In this paper, we compute the perturbations arising from gravitationally-induced stimulated creation when perturbations are already present in the initial state. The effect of these initial perturbations is not diluted by inflation and survives to its end, and beyond. We consider a generic statistical density operator $\rho$ describing an initial mixed state that includes probabilities for nonzero numbers of scalar perturbations to be present at early times during inflation. We analyze the primordial bispectrum for general configurations of the three different momentum vectors in its arguments. We find that the initial presence of quanta can significantly enhance non-gaussianities in the so-called squeezed limit. Our results show that an observation of non-gaussianities in the squeezed limit can occur for single-field inflation when the state in the very early inflationary universe is not the vacuum, but instead contains early-time perturbations. Valuable information about the initial state can then be obtained from observations of those non-gaussianities. \\ ( http://arxiv.org/abs/1010.5766 , 24kb) %%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%% ------------------------------------------------------------------------------ \\ arXiv:0909.3574 replaced with revised version Wed, 27 Oct 2010 08:59:06 GMT (8kb) Title: Exact Scaling Relations In Relativistic Hydrodynamic Turbulence Authors: Itzhak Fouxon, Yaron Oz Categories: hep-th physics.flu-dyn Comments: 4 pages, revtex4, improved discussions and ref. list \\ ( http://arxiv.org/abs/0909.3574 , 8kb) ------------------------------------------------------------------------------ \\ arXiv:0911.3169 replaced with revised version Wed, 27 Oct 2010 14:41:08 GMT (38kb) Title: Solution to the Ward Identities for Superamplitudes Authors: Henriette Elvang, Daniel Z. Freedman, Michael Kiermaier Categories: hep-th Comments: 29 pages, published version Report-no: MIT-CTP-4086, PUPT-2323, MCTP-09-53 \\ ( http://arxiv.org/abs/0911.3169 , 38kb) ------------------------------------------------------------------------------ \\ arXiv:1005.5721 replaced with revised version Wed, 27 Oct 2010 19:54:45 GMT (9kb) Title: Semi-scaling cosmic strings Authors: Vitaly Vanchurin Categories: hep-th astro-ph.CO gr-qc hep-ph Comments: 8 pages, minor corrections, accepted for publication in JCAP \\ ( http://arxiv.org/abs/1005.5721 , 9kb) ------------------------------------------------------------------------------ \\ arXiv:1006.5438 replaced with revised version Wed, 27 Oct 2010 17:47:34 GMT (61kb) Title: Y-system and beta-deformed N=4 Super-Yang-Mills Authors: Nikolay Gromov, Fedor Levkovich-Maslyuk Categories: hep-th Comments: Appendix extended by a comparison with the more recent papers \\ ( http://arxiv.org/abs/1006.5438 , 61kb) ------------------------------------------------------------------------------ \\ arXiv:1007.0194 (*cross-listing*) replaced with revised version Wed, 27 Oct 2010 13:04:41 GMT (31kb) Title: A Tree-Loop Duality Relation at Two Loops and Beyond Authors: Isabella Bierenbaum, Stefano Catani, Petros Draggiotis, German Rodrigo Categories: hep-ph hep-th Comments: 20 pages. Few typos corrected, some additional comments included, Appendix B and one reference added. Final version as published in JHEP Report-no: IFIC/10-17 \\ ( http://arxiv.org/abs/1007.0194 , 31kb) ------------------------------------------------------------------------------ \\ arXiv:1007.1457 replaced with revised version Wed, 27 Oct 2010 18:41:47 GMT (10kb) Title: Localized D-dimensional global k-defects Authors: P.P. Avelino, D. Bazeia, R. Menezes, J.G.G.S. Ramos Categories: hep-th astro-ph.CO hep-ph Comments: 5 pages \\ ( http://arxiv.org/abs/1007.1457 , 10kb) ------------------------------------------------------------------------------ \\ arXiv:1007.3639 replaced with revised version Wed, 27 Oct 2010 11:23:17 GMT (112kb) Title: Towards Field Theory Amplitudes From the Cohomology of Pure Spinor Superspace Authors: Carlos R. Mafra Categories: hep-th Comments: 14 pages, harvmac, v4: trivial edits in the text to comply with JHEP referee Report-no: AEI-2010-124 \\ ( http://arxiv.org/abs/1007.3639 , 112kb) ------------------------------------------------------------------------------ \\ arXiv:1008.1406 replaced with revised version Wed, 27 Oct 2010 07:39:56 GMT (3406kb,D) Title: Non-Gaussianity from Lifshitz Scalar Authors: Keisuke Izumi, Takeshi Kobayashi, Shinji Mukohyama Categories: hep-th astro-ph.CO gr-qc hep-ph Comments: 17 pages, 15 figures, v2: published in JCAP Report-no: IPMU10-0133, ICRR-Report-571 Journal-ref: JCAP10(2010)031 DOI: 10.1088/1475-7516/2010/10/031 \\ ( http://arxiv.org/abs/1008.1406 , 3406kb) ------------------------------------------------------------------------------ \\ arXiv:1008.1562 (*cross-listing*) replaced with revised version Wed, 27 Oct 2010 14:36:34 GMT (70kb) Title: Scattering theory and the Aharonov--Bohm effect in quasiclassical physics Authors: Yurii A. Sitenko and Nadiia D. Vlasii Categories: quant-ph cond-mat.str-el hep-th math-ph math.MP Comments: 26 pages, 3 figures, minor changes, references updated \\ ( http://arxiv.org/abs/1008.1562 , 70kb) ------------------------------------------------------------------------------ \\ arXiv:1009.0901 (*cross-listing*) replaced with revised version Wed, 27 Oct 2010 19:04:49 GMT (20kb) Title: A proposal of a fine tuning free formulation of 4d N=4 super Yang-Mills Authors: Masanori Hanada Categories: hep-lat hep-th Comments: v1: 16 pages, no figure. v2: 18 pages, no figure. Comments and references added. Title changed slightly following the referee's suggestion. The version accepted by JHEP Report-no: WIS/14/10-AUG-DPPA \\ ( http://arxiv.org/abs/1009.0901 , 20kb) ------------------------------------------------------------------------------ \\ arXiv:1010.2948 (*cross-listing*) replaced with revised version Wed, 27 Oct 2010 16:56:33 GMT (75kb) Title: Absence of sign problem in two-dimensional N=(2,2) super Yang-Mills on lattice Authors: Masanori Hanada and Issaku Kanamori Categories: hep-lat hep-th Comments: 24 pages, 19 figures; v2: comments and references added Report-no: DFTT 18/2010, RIKEN-TH-196, WIS/15/10-OCT-DPPA \\ ( http://arxiv.org/abs/1010.2948 , 75kb) ------------------------------------------------------------------------------ \\ arXiv:1010.3203 (*cross-listing*) replaced with revised version Wed, 27 Oct 2010 09:59:31 GMT (107kb,D) Title: Stimulated Supersymmetry Breaking Authors: Matthew McCullough Categories: hep-ph hep-th Comments: v1: 9 pages, 3 figures. v2: Minor corrections and changes Report-no: OUTP-10-29P \\ ( http://arxiv.org/abs/1010.3203 , 107kb) ------------------------------------------------------------------------------ \\ arXiv:1010.4382 (*cross-listing*) replaced with revised version Wed, 27 Oct 2010 00:54:44 GMT (18kb) Title: A vertex operator approach for form factors of Belavin's $(\mathbb{Z}/n\mathbb{Z})$-symmetric model and its application Authors: Yas-Hiro Quano Categories: math-ph hep-th math.MP math.QA Comments: A reference is added, 22pages, partly based on a talk given in International Workshop `RAQIS'10', Recent Advances in Quantum Integrable Systems, held at LAPTH, Annecy-le-Vieux, France, 15--18 June 2010 MSC-class: 39 \\ ( http://arxiv.org/abs/1010.4382 , 18kb) %%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%--- 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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