Date: Wed, 29 Sep 10 00:06:18 GMT Subject: hep-th daily 14 new + 10 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 Sep 10 20:00:00 GMT to Tue 28 Sep 10 20:00:00 GMT ------------------------------------------------------------------------------ \\ arXiv:1009.5385 Date: Mon, 27 Sep 2010 20:02:55 GMT (51kb) Title: An operational view on the holographic information bound Authors: Karel Van Acoleyen Categories: hep-th gr-qc Comments: 10 pages, 1 figure \\ We study the covariant holographic entropy bound from an operational standpoint. Therefore we consider the physical limit for observations on a light-sheet. A light-sheet is a particular null hypersurface, and the natural measuring apparatus is a screen. By considering the physical properties of the screen - as dictated by quantum mechanics - we derive an uncertainty relation. This connects the number of bits of decoded information on the light-sheet to two geometric uncertainties: the uncertainty on the place where the bits are located and the uncertainty on the local expansion of the light-sheet. From this relation we can argue a local operational version of the (generalized) covariant entropy bound: the maximum number of bits decoded on a light-sheet interval goes like the area difference (in Planck units) of the initial and final surface spanned by the light rays. \\ ( http://arxiv.org/abs/1009.5385 , 51kb) ------------------------------------------------------------------------------ \\ arXiv:1009.5386 Date: Mon, 27 Sep 2010 20:06:43 GMT (53kb,D) Title: On the computation of non-perturbative effective potentials in the string theory landscape -- IIB/F-theory perspective Authors: Mirjam Cveti\v{c}, I\~naki Garc\'ia-Etxebarria and James Halverson Categories: hep-th Comments: 52 pages Report-no: UPR-1219-T \\ We discuss a number of issues arising when computing non-perturbative effects systematically across the string theory landscape. In particular, we cast the study of fairly generic physical properties into the language of computability/number theory and show that this amounts to solving systems of diophantine equations. In analogy to the negative solution to Hilbert's 10th problem, we argue that in such systematic studies there may be no algorithm by which one can determine all physical effects. We take large volume type IIB compactifications as an example, with the physical property of interest being the low-energy non-perturbative F-terms of a generic compactification. A similar analysis is expected to hold for other kinds of string vacua, and we discuss in particular the extension of our ideas to F-theory. While these results imply that it may not be possible to answer systematically certain physical questions about generic type IIB compactifications, we identify particular Calabi-Yau manifolds in which the diophantine equations become linear, and thus can be systematically solved. As part of the study of the required systematics of F-terms, we develop technology for computing Z_2 equivariant line bundle cohomology on toric varieties, which determines the presence of particular instanton zero modes via the Koszul complex. This is of general interest for realistic IIB model building on complete intersections in toric ambient spaces. \\ ( http://arxiv.org/abs/1009.5386 , 53kb) ------------------------------------------------------------------------------ \\ arXiv:1009.5387 Date: Mon, 27 Sep 2010 20:08:27 GMT (10kb) Title: One Monopole with k Singularities Authors: Sergey A. Cherkis and Chris D. A. Blair Categories: hep-th Comments: 12 pages, LaTeX Report-no: TCDMATH 10-06, HMI 10-04 \\ We present all charge one monopole solutions of the Bogomolny equation with k prescribed Dirac singularities for the gauge groups U(2), SO(3), or SU(2). We analyze these solutions comparing them to the previously known expressions for the cases of one or two singularities. \\ ( http://arxiv.org/abs/1009.5387 , 10kb) ------------------------------------------------------------------------------ \\ arXiv:1009.5414 Date: Mon, 27 Sep 2010 23:53:35 GMT (6kb) Title: Gravity is not an entropic force Authors: Archil Kobakhidze Categories: hep-th gr-qc Comments: 5 pages \\ We argue that experiments with ultra-cold neutrons in the gravitational field of Earth disprove recent speculations on the entropic origin of gravitation. \\ ( http://arxiv.org/abs/1009.5414 , 6kb) ------------------------------------------------------------------------------ \\ arXiv:1009.5429 Date: Tue, 28 Sep 2010 02:35:20 GMT (47kb) Title: Zero-modes of Non-Abelian Solitons in Three Dimensional Gauge Theories Authors: Minoru Eto and Sven Bjarke Gudnason Categories: hep-th Comments: 54 pages, 1 figure Report-no: RIKEN-MP-4, IFUP-TH/2010-23 \\ We study non-Abelian solitons of the Bogomol'nyi type in N=2 (d=2+1) supersymmetric Chern-Simons (CS) and Yang-Mills (YM) theory with a generic gauge group. In CS theory, we find topological, non-topological and semi-local (non-)topological vortices of non-Abelian kinds in unbroken, broken and partially broken vacua. We calculate the number of zero-modes using an index theorem and then we apply the moduli matrix formalism to realize the moduli parameters. For the topological solitons we exhaust all the moduli while we study several examples of the non-topological and semi-local solitons. We find that the zero-modes of the topological solitons are governed by the moduli matrix H_0 only and those of the non-topological solitons are governed by both H_0 and the gauge invariant field \Omega. We prove local uniqueness of the master equation in the YM case and finally, compare all results between the CS and YM theories. \\ ( http://arxiv.org/abs/1009.5429 , 47kb) ------------------------------------------------------------------------------ \\ arXiv:1009.5447 Date: Tue, 28 Sep 2010 05:11:25 GMT (3172kb,D) Title: Higher Genus BMN Correlators: Factorization and Recursion Relations Authors: Min-xin Huang Categories: hep-th Comments: 71 pages, 31 figures Report-no: IPMU10-0169 \\ We systematically study the factorization and recursion relations in higher genus correlation functions of BMN (Berenstein-Maldacena-Nastase) operators in free N=4 super Yang Mills theory. These properties were found in a previous paper by the author, and were conjectured to result from the correspondence with type IIB string theory on the infinitely curved pp-wave background, where the strings become effectively infinitely long. Here we push the calculations to higher genus, provide more clarifications and verifications of the factorization and recursion relations. Our calculations provide conjectural indirect tests of the AdS/CFT correspondence for multi-loop superstring amplitudes of stringy modes. \\ ( http://arxiv.org/abs/1009.5447 , 3172kb) ------------------------------------------------------------------------------ \\ arXiv:1009.5486 Date: Tue, 28 Sep 2010 08:34:53 GMT (29kb) Title: Domain Walls and Metastable Vacua in Hot Orientifold Field Theories Authors: Adi Armoni, Chris P. Korthals Altes, Agostino Patella Categories: hep-th Comments: 29 pages, 4 figures \\ We consider "Orientifold field theories", namely SU(N) gauge theories with Dirac fermions in the two-index representation at high temperature. When N is even these theories exhibit a spontaneously broken Z2 centre symmetry. We study aspects of the domain wall that interpolates between the two vacua of the theory. In particular we calculate its tension to two-loop order. We compare its tension to the corresponding domain wall in a SU(N) gauge theory with adjoint fermions and find an agreement at large-N, as expected from planar equivalence between the two theories. Moreover, we provide a non-perturbative proof for the coincidence of the tensions at large-N. We also discuss the vacuum structure of the theory when the fermion is given a large mass and argue that there exist N-2 metastable vacua. We calculate the lifetime of those vacua in the thin wall approximation. \\ ( http://arxiv.org/abs/1009.5486 , 29kb) ------------------------------------------------------------------------------ \\ arXiv:1009.5492 Date: Tue, 28 Sep 2010 08:52:22 GMT (225kb) Title: Classification of Hypercylindrical Spacetimes with Momentum Flow Authors: Hyeong-Chan Kim, Gungwon Kang, Jungjai Lee and Youngone Lee Categories: hep-th gr-qc Comments: 13 pages, 3 figures \\ We study the behavior of ADM mass, tension and momentum densities characterizing asymptotically hypercylindrical metrics in five-dimensional spacetime under boosts along the cylindrical axis. For such string-like metrics two boost-invariant quantities are found, which are a sort of "string rest mass-squared" and the sum of mass and tension densities. Analogous to the case of a moving point particle, we show that the asymptotically hypercylindrical geometries can be classified into three types depending on the value of the "string rest mass-squared", namely, "ordinary string", "null string" and "tachyon-like string" geometries. This asymptotic analysis shows that the extraordinary metrics reported recently by some of the authors belong to the "tachyon-like string". Consequently, it is likely that such extraordinary solutions are the final states of tachyonic matter collapse. We also report two new vacuum solutions which belong to the "null string" and the "tachyon-like string", respectively. \\ ( http://arxiv.org/abs/1009.5492 , 225kb) ------------------------------------------------------------------------------ \\ arXiv:1009.5553 Date: Tue, 28 Sep 2010 12:54:23 GMT (40kb) Title: Seiberg-Witten curve via generalized matrix model Authors: Kazunobu Maruyoshi, Futoshi Yagi Categories: hep-th Comments: 21 pages, 3 figures Report-no: YITP-10-84, IHES/P/10/34 \\ We study the generalized matrix model which corresponds to the n-point toric Virasoro conformal block. This describes four-dimensional N=2 SU(2)^n gauge theory with circular quiver diagram by the AGT relation. We first verify that it is obtained from the perturbative calculation of the Liouville correlation function. We derive the Seiberg-Witten curve for N=2 gauge theory as a spectral curve of the generalized matrix model. \\ ( http://arxiv.org/abs/1009.5553 , 40kb) ------------------------------------------------------------------------------ \\ arXiv:1009.5559 Date: Tue, 28 Sep 2010 13:20:01 GMT (7kb) Title: Reciprocity of higher conserved charges in the sl(2) sector of N=4 SYM Authors: Guido Macorini and Matteo Beccaria Categories: hep-th Comments: 5 pages. Poster presented at 'Nonlinear Physics. Theory and Experiment VI', Gallipoli (Italy) - June 23 - July 3, 2010 \\ We extend the anlysis of the generalized Gribov-Lipatov reciprocity to the higher conserved charges of type IIB superstring on AdS5 x S5. The property is shown to hold for twist 2, and 3 operators in the sl(2) subsector. \\ ( http://arxiv.org/abs/1009.5559 , 7kb) ------------------------------------------------------------------------------ \\ arXiv:1009.5561 Date: Tue, 28 Sep 2010 13:25:45 GMT (6kb) Title: Entropic Corrections to Coulomb's Law Authors: A. Sheykhi and S. H. Hendi Categories: hep-th Comments: 4 pages, no figure \\ Starting from the holographic principle and an equipartition rule, Verlinde derived Newton's law of gravitation as well as Einstein equation. In this Letter, we apply Verlinde's approach on the entropic force to derive the quantum corrections to Coulomb's Law. We adopt the viewpoint that gravity can be emerged as an entropic force and assume the entropy-area relation can be modified from the inclusion of quantum effects, motivated from the loop quantum gravity. \\ ( http://arxiv.org/abs/1009.5561 , 6kb) ------------------------------------------------------------------------------ \\ arXiv:1009.5615 Date: Tue, 28 Sep 2010 16:08:11 GMT (36kb) Title: Holomorphic quantization of linear field theory in the general boundary formulation Authors: Robert Oeckl (UNAM) Categories: hep-th math-ph math.MP Comments: 38 pages, LaTeX + AMS Report-no: UNAM-IM-MOR-2010-1 MSC-class: 57R56 81S10 81T05 81T20 \\ We present a rigorous quantization scheme that yields a quantum field theory in general boundary form starting from a linear field theory. Following a geometric quantization approach in the K\"ahler case, state spaces arise as spaces of holomorphic functions on linear spaces of classical solutions in neighborhoods of hypersurfaces. Amplitudes arise as integrals of such functions over spaces of classical solutions in regions of spacetime. We prove the validity of the TQFT-type axioms of the general boundary formulation under reasonable assumptions. We also develop the notions of vacuum and coherent states in this framework. As a first application we quantize evanescent waves in Klein-Gordon theory. \\ ( http://arxiv.org/abs/1009.5615 , 36kb) ------------------------------------------------------------------------------ \\ arXiv:1009.5660 Date: Tue, 28 Sep 2010 19:23:05 GMT (75kb,D) Title: Minimal cut-off vacuum state constraints from CMB bispectrum statistics Authors: P. Daniel Meerburg and Jan Pieter van der Schaar Categories: hep-th Comments: 9 pages, 1 figure \\ In this short note we translate the best available observational bounds on the CMB bispectrum amplitudes into constraints on a specific scale-invariant New Physics Hypersurface (NPH) model of vacuum state modifications, as first proposed by Danielsson, in general models of single-field inflation. As compared to the power spectrum the bispectrum constraints are less ambiguous and provide an interesting upper bound on the cut-off scale in general models of single-field inflation with a small speed of sound. This upper bound is incompatible with the power spectrum constraint for most of the parameter domain, leaving very little room for minimal cut-off vacuum state modifications in general single-field models with a small speed of sound. \\ ( http://arxiv.org/abs/1009.5660 , 75kb) ------------------------------------------------------------------------------ \\ arXiv:1009.5668 Date: Tue, 28 Sep 2010 19:51:46 GMT (2809kb) Title: Brane Physics in Non-Critical Theories Authors: Mauricio B. Sturla Categories: hep-th Comments: PhD Thesis. Facultad de Ciencias Exactas. Universidad Nacional de La Plata. (Full text in Spanish) \\ In this Thesis, we focus on the study of the low energy approximation to non-critical string theories. We present an exhaustive study of their solutions, which are divided in three cases: vacuum, NSNS charged, and RR charged solutions. In the first case, we find all possible solutions, including the previously known ones, which are special cases of ours. In the second case, we present the fundamental non-critical string, doubly localized in Minkowski \times the cigar vacuum. There are only a few known solutions doubly localized. Also, we completely solve the problem of finding NSNS solutions that fill all the Minkowski space. In the third case, we present new parametric families that contain some of the previously known solutions at particular values of the parameters. For the latter families, we have obtained the gauge duals in the context of the gauge/gravity duality, and we show that, in a particular region of the parameter space, these theories can confine. Finally, we study the obtained YM in D=3 and YM in D=4 theories, and we show the corresponding glueball spectra, that are in very good agreement with those predicted by lattice QCD. \\ ( http://arxiv.org/abs/1009.5668 , 2809kb) %-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%- ------------------------------------------------------------------------------ \\ arXiv:1006.3011 (*cross-listing*) Date: Tue, 15 Jun 2010 15:29:08 GMT (1547kb) Date (revised v2): Tue, 28 Sep 2010 07:56:39 GMT (1548kb) Title: Modification of black-body radiance at low temperatures and frequencies Authors: Carlos Falquez, Ralf Hofmann, and Tilo Baumbach Categories: hep-ph hep-th Comments: 10 pp, 5 figs; v2: slight changes in text, extended discussion of Rydberg-atom experiment \\ In contrast to earlier reports, where the spectrum of the {\sl energy density} of photonic black-body radiation modified by SU(2) effects was discussed, we discuss the low-frequency spectrum of the {\sl radiance} at temperatures ranging between 5 and 20 Kelvin. We conclude that compared to the conventional theory the only observable effect is associated with the spectral gap (total screening). We also discuss how a low-temperature black body cavity under the influence of a sufficiently strong static electric field is forced to emit according to Planck's radiation law (pure U(1) theory) even at low frequencies and how this effect can be utilized to measure SU(2) induced deviations. \\ ( http://arxiv.org/abs/1006.3011 , 1548kb) ------------------------------------------------------------------------------ \\ arXiv:1009.3402 (*cross-listing*) Date: Fri, 17 Sep 2010 11:46:21 GMT (223kb) Title: Polyhedra in loop quantum gravity Authors: Eugenio Bianchi, Pietro Dona' and Simone Speziale Categories: gr-qc hep-th Comments: 32 pages, many figures \\ Interwiners are the building blocks of spin-network states. The space of intertwiners is the quantization of a classical symplectic manifold introduced by Kapovich and Millson. Here we show that a theorem by Minkowski allows us to interpret generic configurations in this space as bounded convex polyhedra in Euclidean space: a polyhedron is uniquely described by the areas and normals to its faces. We provide a reconstruction of the geometry of the polyhedron: we give formulas for the edge lengths, the volume and the adjacency of its faces. At the quantum level, this correspondence allows us to identify an intertwiner with the state of a quantum polyhedron, thus generalizing the notion of quantum tetrahedron familiar in the loop quantum gravity literature. Moreover, coherent intertwiners result to be peaked on the classical geometry of a polyhedron. We discuss the relevance of this result for loop quantum gravity. In particular, coherent spin-network states with nodes of arbitrary valence represent a collection of semiclassical polyhedra. Furthermore, we introduce an operator that measures the volume of a quantum polyhedron and examine its relation with the standard volume operator of loop quantum gravity. We also comment on the semiclassical limit of spinfoams with non-simplicial graphs. \\ ( http://arxiv.org/abs/1009.3402 , 223kb) ------------------------------------------------------------------------------ \\ arXiv:1009.5284 Date: Mon, 27 Sep 2010 15:15:59 GMT (17kb) Title: Non-Abelian Discrete Flavor Symmetries on Orbifolds Authors: Hiroyuki Abe, Kang-Sin Choi, Tatsuo Kobayashi, Hiroshi Ohki and Manabu Sakai Categories: hep-th hep-ph Comments: 16 pages \\ We study non-Abelian flavor symmetries on orbifolds, $S^1/Z_2$ and $T^2/Z_3$. Our extra dimensional models realize $D_N$, $\Sigma(2N^2)$, $\Delta(3N^2)$ and $\Delta(6N^2)$ including $A_4$ and $S_4$. In addition, one can also realize their subgroups such as $Q_N$, $T_7$, etc. The $S_3$ flavor symmetry can be realized on both $S^1/Z_2$ and $T^2/Z_3$ orbifolds. \\ ( http://arxiv.org/abs/1009.5284 , 17kb) ------------------------------------------------------------------------------ \\ arXiv:1009.5380 (*cross-listing*) Date: Mon, 27 Sep 2010 20:00:19 GMT (86kb,D) Title: Extreme Technicolor & The Walking Critical Temperature Authors: Matti Jarvinen and Francesco Sannino Categories: hep-ph hep-lat hep-th Comments: RevTeX, 18 pages, 3 figures Report-no: CP3-Origins-2010-39, CCTP-2010-12 \\ We map the phase diagram of gauge theories of fundamental interactions in the flavor-temperature plane using chiral perturbation theory to estimate the relation between the pion decaying constant and the critical temperature above which chiral symmetry is restored. We then investigate the impact of our results on models of dynamical electroweak symmetry breaking and therefore on the electroweak early universe phase transition. \\ ( http://arxiv.org/abs/1009.5380 , 86kb) ------------------------------------------------------------------------------ \\ arXiv:1009.5406 (*cross-listing*) Date: Mon, 27 Sep 2010 21:57:46 GMT (744kb,D) Title: Scaling Limit of the Noncommutative Black Hole Authors: Shahn Majid Categories: gr-qc hep-th math.QA Comments: 13 pages, 3 figures with several pdf graphics \\ We show that the recent `quantum' black hole wave operator in the $\kappa$-Minkowski or bicrossproduct model quantum spacetime has a natural scaling limit $\lambda_p\to 0$ at the event horizon. Here $\lambda_p$ is the Planck time and the geometry at the event horizon in Planck length is maintained at the same time as the limit is taken, resulting in a classical theory with quantum gravity remnants. Among the features is a frequency-dependent `skin' of some $\omega\over\nu$ Planck lengths just inside the event horizon for $\omega>0$ and just outside for $\omega<0$, where $\nu$ is the frequency associated to the Schwarzschild radius. We use bessel and hypergeometric functions to analyse propagation through the event horizon and skin in both directions. The analysis confirms a finite redshift at the horizon for positive frequency modes in the exterior. \\ ( http://arxiv.org/abs/1009.5406 , 744kb) ------------------------------------------------------------------------------ \\ arXiv:1009.5458 (*cross-listing*) Date: Tue, 28 Sep 2010 06:23:27 GMT (52kb) Title: Brane worlds and dark matter Authors: Shahab Shahidi and Hamid Reza Sepangi Categories: gr-qc hep-th Comments: 13 pages, 1 figure, to appear in IJMPD \\ Two problems related to dark matter is considered in the context of a brane world model in which the confinement of gauge fields on the brane is achieved by invoking a confining potential. First, we show that the virial mass discrepancy can be addressed if the conserved geometrical term appearing in this model is considered as an energy momentum tensor of an unknown type of matter, the so-called X-matter whose equation of state is also obtained. Second, the galaxy rotation curves are explained by assuming an anisotropic energy momentum tensor for the X-matter. \\ ( http://arxiv.org/abs/1009.5458 , 52kb) ------------------------------------------------------------------------------ \\ arXiv:1009.5466 (*cross-listing*) Date: Tue, 28 Sep 2010 06:56:00 GMT (988kb) Title: The quantum origin of cosmic structure: theory and observations Authors: Konstantinos Dimopoulos Categories: astro-ph.CO hep-ph hep-th Comments: Contribution to the proceedings of the conference: Recent Developments in Gravity (NEB-14) 06/2010, Ioannina, Greece. LaTex, 22 pages, 6 figures \\ The particle production process is reviewed, through which cosmic inflation can produce a scale invariant superhorizon spectrum of perturbations of suitable fields starting from their quantum fluctuations. Afterwards, in the context of the inflationary paradigm, a number of mechanisms (e.g. curvaton, inhomogeneous reheating etc.) through which such perturbations can source the curvature perturbation in the Universe and explain the formation of structures such as galaxies are briefly described. Finally, the possibility that cosmic vector fields also contribute to the curvature perturbation (e.g. through the vector curvaton mechanism) is considered and its distinct observational signatures are discussed, such as correlated statistical anisotropy in the spectrum and bispectrum of the curvature perturbation. \\ ( http://arxiv.org/abs/1009.5466 , 988kb) ------------------------------------------------------------------------------ \\ arXiv:1009.5482 (*cross-listing*) Date: Tue, 28 Sep 2010 07:49:06 GMT (81kb) Title: Techni-dilaton at Conformal Edge Authors: Michio Hashimoto, Koichi Yamawaki Categories: hep-ph hep-lat hep-th Comments: 16 pages, 14 figures \\ Techni-dilaton (TD) was proposed long ago in the technicolor (TC) near criticality/conformality. To reveal the critical behavior of TD, we explicitly compute the nonperturbative contributions to the scale anomaly $<\theta^\mu_\mu>$ and to the techni-gluon condensate $$, which are generated by the dynamical mass m of the techni-fermions. Our computation is based on the (improved) ladder Schwinger-Dyson equation, with the gauge coupling $\alpha$ replaced by the two-loop running one $\alpha(\mu)$ having the Caswell-Banks-Zaks IR fixed point $\alpha_*$: $\alpha(\mu) \simeq \alpha = \alpha_*$ for the IR region $m < \mu < \Lambda_{TC}$, where $\Lambda_{TC}$ is the intrinsic scale (analogue of $\Lambda_{QCD}$ of QCD) relevant to the perturbative scale anomaly. We find that $-<\theta^\mu_\mu>/m^4\to const \ne 0$ and $/m^4\to (\alpha/\alpha_{cr}-1)^{-3/2}\to\infty$ in the criticality limit $m/\Lambda_{TC}\sim\exp(-\pi/(\alpha/\alpha_{cr}-1)^{1/2})\to 0$ ($\alpha=\alpha_* \to \alpha_{cr}$) ("conformal edge"). Our result precisely reproduces the formal identity $<\theta^\mu_\mu>=(\beta(\alpha)/4 \alpha) $, where $\beta(\alpha)=-(2\alpha_{cr}/\pi) (\alpha/\alpha_{cr}-1)^{3/2}$ is the nonperturbative beta function corresponding to the above essential singularity scaling of $m/\Lambda_{TC}$. Accordingly, the PCDC implies $(M_{TD}/m)^2 (F_{TD}/m)^2=-4<\theta_\mu^\mu>/m^4 \to const \ne 0$ at criticality limit, where $M_{TD}$ is the mass of TD and $F_{TD}$ the decay constant of TD. We thus conclude that at criticality limit the TD could become a "true (massless) Nambu-Goldstone boson" $M_{TD}/m\to 0$, only when $m/F_{TD}\to 0$, namely getting decoupled, as was the case of "holographic TD" of Haba-Matsuzaki-Yamawaki. The decoupled TD can be a candidate of dark matter. \\ ( http://arxiv.org/abs/1009.5482 , 81kb) ------------------------------------------------------------------------------ \\ arXiv:1009.5514 (*cross-listing*) Date: Tue, 28 Sep 2010 10:12:08 GMT (469kb) Title: Varying constants, Gravitation and Cosmology Authors: Jean-Philippe Uzan Categories: astro-ph.CO gr-qc hep-ph hep-th nucl-th physics.atom-ph Comments: 145 pages, 10 figures, Review for Living Reviews in Relativity \\ Fundamental constants are a cornerstone of our physical laws. Any constant varying in space and/or time would reflect the existence of an almost massless field that couples to matter. This will induce a violation of the universality of free fall. It is thus of utmost importance for our understanding of gravity and of the domain of validity of general relativity to test for their constancy. We thus detail the relations between the constants, the tests of the local position invariance and of the universality of free fall. We then review the main experimental and observational constraints that have been obtained from atomic clocks, the Oklo phenomenon, Solar system observations, meteorites dating, quasar absorption spectra, stellar physics, pulsar timing, the cosmic microwave background and big bang nucleosynthesis. At each step we describe the basics of each system, its dependence with respect to the constants, the known systematic effects and the most recent constraints that have been obtained. We then describe the main theoretical frameworks in which the low-energy constants may actually be varying and we focus on the unification mechanisms and the relations between the variation of different constants. To finish, we discuss the more speculative possibility of understanding their numerical values and the apparent fine-tuning that they confront us with. \\ ( http://arxiv.org/abs/1009.5514 , 469kb) ------------------------------------------------------------------------------ \\ arXiv:1009.5595 (*cross-listing*) Date: Tue, 28 Sep 2010 15:10:43 GMT (18kb) Title: Consistent matter couplings for Plebanski gravity Authors: Felix Tennie, Mattias N.R. Wohlfarth Categories: gr-qc hep-th Comments: 20 pages \\ We develop a scheme for the minimal coupling of all standard types of tensor and spinor field matter to Plebanski gravity. This theory is a geometric reformulation of vacuum general relativity in terms of two-form frames and connection one-forms, and provides a covariant basis for various quantization approaches. Using the spinor formalism we prove the consistency of the newly proposed matter coupling by demonstrating the full equivalence of Plebanski gravity plus matter to Einstein--Cartan gravity. As a byproduct we also show the consistency of some previous suggestions for matter actions. \\ ( http://arxiv.org/abs/1009.5595 , 18kb) %%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%% ------------------------------------------------------------------------------ \\ arXiv:0811.0112 (*cross-listing*) replaced with revised version Tue, 28 Sep 2010 16:37:34 GMT (25kb) Title: The existence of time Authors: Joseph Andrew Spencer, James T. Wheeler Categories: gr-qc hep-th Comments: 21 pages (Reduced to clarify and focus on central argument; some calculations condensed; typos corrected) \\ ( http://arxiv.org/abs/0811.0112 , 25kb) ------------------------------------------------------------------------------ \\ arXiv:0905.3427 replaced with revised version Tue, 28 Sep 2010 00:31:05 GMT (9kb) Title: Diffeomorphism-invariant noncommutative gravity with twisted local Lorentz invariance Authors: Archil Kobakhidze Categories: hep-th gr-qc hep-ph Comments: 7 pages; v2 to be published in EJTP \\ ( http://arxiv.org/abs/0905.3427 , 9kb) ------------------------------------------------------------------------------ \\ arXiv:0912.3350 (*cross-listing*) replaced with revised version Tue, 28 Sep 2010 11:07:18 GMT (52kb) Title: Introduction to Quantum Integrability Authors: Anastasia Doikou, Stefano Evangelisti, Giovanni Feverati, Nikos Karaiskos Categories: math-ph cond-mat.stat-mech hep-th math.MP nlin.SI Comments: 56 pages, Latex. A few typos corrected Report-no: LAPTH-1367/09 Journal-ref: Int.J.Mod.Phys.A25:3307-3351,2010 DOI: 10.1142/S0217751X10049803 \\ ( http://arxiv.org/abs/0912.3350 , 52kb) ------------------------------------------------------------------------------ \\ arXiv:1003.0236 replaced with revised version Tue, 28 Sep 2010 01:19:58 GMT (150kb,D) Title: Observing the Dimensionality of Our Parent Vacuum Authors: Peter W. Graham, Roni Harnik, Surjeet Rajendran Categories: hep-th astro-ph.CO gr-qc hep-ph Comments: 30 pages, 2 figures. v2: minor changes to agree with published version Journal-ref: Phys.Rev.D82:063524,2010 DOI: 10.1103/PhysRevD.82.063524 \\ ( http://arxiv.org/abs/1003.0236 , 150kb) ------------------------------------------------------------------------------ \\ arXiv:1005.2444 (*cross-listing*) replaced with revised version Tue, 28 Sep 2010 03:00:25 GMT (62kb) Title: Five-dimensional vacuum Einstein spacetimes in C-metric like coordinates Authors: Wei Xu, Liu Zhao and Bin Zhu Categories: gr-qc hep-th Comments: 18 pages, 3 figures. Minor modifications, version appeared in Mod. Phys. Lett. A Journal-ref: Mod. Phys. Lett. A, Vol. 25, No. 32 (2010) pp. 2727-2743 \\ ( http://arxiv.org/abs/1005.2444 , 62kb) ------------------------------------------------------------------------------ \\ arXiv:1007.4720 (*cross-listing*) replaced with revised version Tue, 28 Sep 2010 15:42:58 GMT (81kb) Title: Closed flux tubes and their string description in D=3+1 SU(N) gauge theories Authors: Andreas Athenodorou, Barak Bringoltz and Michael Teper Categories: hep-lat hep-th Comments: 65 pages, 22 figures; more on massive modes, minor corrections, recent references added Report-no: DESY 10-116 \\ ( http://arxiv.org/abs/1007.4720 , 81kb) ------------------------------------------------------------------------------ \\ arXiv:1008.1778 replaced with revised version Tue, 28 Sep 2010 17:16:47 GMT (8kb) Title: The b Ghost of the Pure Spinor Formalism is Nilpotent Authors: Osvaldo Chandia Categories: hep-th Comments: 12 pages, harvmac-b. Minor changes \\ ( http://arxiv.org/abs/1008.1778 , 8kb) ------------------------------------------------------------------------------ \\ arXiv:1009.0905 (*cross-listing*) replaced with revised version Tue, 28 Sep 2010 14:28:56 GMT (13kb) Title: A unique Z_4^R symmetry for the MSSM Authors: Hyun Min Lee, Stuart Raby, Michael Ratz, Graham G. Ross, Roland Schieren, Kai Schmidt-Hoberg, Patrick K.S. Vaudrevange Categories: hep-ph hep-th Comments: 6 pages Report-no: TUM-HEP 770/10; LMU-ASC 64/10; OHSTPY-HEP-T-10-003; CERN-PH-TH/2010-193; OUTP-10-24P \\ ( http://arxiv.org/abs/1009.0905 , 13kb) ------------------------------------------------------------------------------ \\ arXiv:1009.4885 replaced with revised version Mon, 27 Sep 2010 21:56:57 GMT (9kb) Title: An Alternative Approach for General Covariant Horava-Lifshitz Gravity and Matter Coupling Authors: Alan M. da Silva Categories: hep-th gr-qc Comments: revtex4, 5 pages, corrected some typos \\ ( http://arxiv.org/abs/1009.4885 , 9kb) %%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%--- 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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