Date: Thu, 29 Oct 09 00:00:50 GMT Subject: hep-th daily 17 new + 4 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 27 Oct 09 20:00:02 GMT to Wed 28 Oct 09 20:00:01 GMT ------------------------------------------------------------------------------ \\ arXiv:0910.5222 Date: Wed, 28 Oct 2009 19:49:29 GMT (499kb) Title: Dressing the Post-Newtonian two-body problem and Classical Effective Field Theory Authors: Barak Kol and Michael Smolkin Categories: hep-th Comments: 38 pages, 28 figures \\ We apply a dressed perturbation theory to better organize and economize the computation of high orders of the 2-body effective action of an inspiralling Post-Newtonian gravitating binary. We use the effective field theory approach with the non-relativistic field decomposition (NRG fields). For that purpose we develop quite generally the dressing theory of a non-linear classical field theory coupled to point-like sources. We introduce dressed charges and propagators, but unlike the quantum theory there are no dressed bulk vertices. The dressed quantities are found to obey recursive integral equations which succinctly encode parts of the diagrammatic expansion, and are the classical version of the Schwinger-Dyson equations. Actually, the classical equations are somewhat stronger since they involve only finitely many quantities, unlike the quantum theory. Classical diagrams are shown to factorize exactly when they contain non-linear world-line vertices, and we classify all the possible topologies of irreducible diagrams for low loop numbers. We apply the dressing program to our Post-Newtonian case of interest. The dressed charges consist of the dressed energy-momentum tensor after a non-relativistic decomposition, and we compute all dressed charges (in the harmonic gauge) appearing up to 2PN in the 2-body effective action (and more). We determine the irreducible skeleton diagrams up to 3PN and we employ the dressed charges to compute several terms beyond 2PN. \\ ( http://arxiv.org/abs/0910.5222 , 499kb) ------------------------------------------------------------------------------ \\ arXiv:0910.5239 Date: Wed, 28 Oct 2009 14:56:38 GMT (258kb,D) Title: The Active Universe Authors: Alexander Gluck, Helmuth Huffel, Sasa Ilijic, and Gerald Kelnhofer Categories: hep-th Comments: 5 pages, 1 figure \\ Active motion is a concept in complex systems theory and was successfully applied to various problems in nonlinear dynamics. Explicit studies for gravitational potentials were missing so far. We interpret the Friedmann equations with cosmological constant as a dynamical system, which can be made active in a straightforward way. These active Friedmann equations lead to a cyclic universe, which is shown numerically. \\ ( http://arxiv.org/abs/0910.5239 , 258kb) ------------------------------------------------------------------------------ \\ arXiv:0910.5241 Date: Wed, 28 Oct 2009 12:48:31 GMT (96kb) Title: AdS_3/LCFT_2 -- Correlators in Cosmological Topologically Massive Gravity Authors: Daniel Grumiller and Ivo Sachs Categories: hep-th Comments: 39 pages + appendices, 1 eps figure Report-no: MIT-CTP 4079, LMU-ASC 45/09, TUW-09-13, ESI 2188 \\ For cosmological topologically massive gravity at the chiral point we calculate momentum space 2- and 3-point correlators of operators in the postulated dual CFT on the cylinder. These operators are sourced by the bulk and boundary gravitons. Our correlators are fully consistent with the proposal that cosmological topologically massive gravity at the chiral point is dual to a logarithmic CFT. In the process we give a complete classification of normalizable and non-normalizeable left, right and logarithmic solutions to the linearized equations of motion in global AdS_3. \\ ( http://arxiv.org/abs/0910.5241 , 96kb) ------------------------------------------------------------------------------ \\ arXiv:0910.5245 Date: Wed, 28 Oct 2009 19:15:03 GMT (1533kb,D) Title: Linearized Lorentz-Violating Gravity and Discriminant Locus in the Moduli Space of Mass Terms Authors: Andrei Mironov, Sergey Mironov, Alexei Morozov and Andrey Morozov Categories: hep-th Comments: 29 pages Report-no: FIAN/TD-24/08 ITEP/TH-68/08 \\ We analyze the pattern of normal modes in linearized Lorentz-violating massive gravity over the 5-dimensional moduli space of mass terms. Ghost-free theories arise at bifurcation points when the ghosts get out of the spectrum of propagating particles due to vanishing of the coefficient in front of \omega^2 in the propagator. Similarly, the van Dam-Veltman-Zakharov (DVZ) discontinuities in the Newton law arise at another type of bifurcations, when the coefficient vanishes in front of \vec k^2. When the Lorentz invariance is broken, these two kinds of bifurcations get independent and one can easily find a ghost-free model without the DVZ discontinuity in the moduli space, at least, in the quadratic (linearized) approximation. \\ ( http://arxiv.org/abs/0910.5245 , 1533kb) ------------------------------------------------------------------------------ \\ arXiv:0910.5298 Date: Wed, 28 Oct 2009 07:12:58 GMT (50kb) Title: New Gauged Linear Sigma Models for 8D HyperKahler Manifolds and Calabi-Yau Crystals Authors: Yutaka Baba and Ta-Sheng Tai Categories: hep-th Comments: 17 pages, 1 figure Report-no: RIKEN-TH-173 \\ We propose two kinds of gauged linear sigma models whose moludi spaces are real eight-dimensional hyperK\"ahler and Calabi-Yau manifolds, respectively. Here, hyperK\"ahler manifolds have $sp(2)$ holonomy in general and are dual to Type IIB $(p,q)$5-brane configurations. On the other hand, Calabi-Yau fourfolds are toric varieties expressed as quotient spaces. Our model whose Higgs branch realizes a fourfold is different from the usual one directly related to a sympletic quotient procedure. Remarkable features of newly-found three-dimentional Chern-Smons-matter theories, i.e. $dynamical$ Fayet-Iliopoulos parameters, one $dualized$ $photon$ and its residual discrete gauge symmetry appear here as well. \\ ( http://arxiv.org/abs/0910.5298 , 50kb) ------------------------------------------------------------------------------ \\ arXiv:0910.5309 Date: Wed, 28 Oct 2009 08:46:07 GMT (47kb) Title: State-space Correlations and Stabilities Authors: Stefano Bellucci and Bhupendra Nath Tiwari Categories: hep-th Comments: 35 pages, Keywords: Black Hole Physics, Higher-dimensional Black Branes, State-space Correlations and Statistical Configurations. PACS numbers: 04.70.-s Physics of black holes; 04.70.Bw Classical black holes; 04.70.Dy Quantum aspects of black holes, evaporation, thermodynamics; 04.50.Gh Higher-dimensional black holes, black strings, and related objects \\ The state-space pair correlation functions and notion of stability of extremal and non-extremal black holes in string theory and M-theory are considered from the viewpoints of thermodynamic Ruppeiner geometry. From the perspective of intrinsic Riemannian geometry, the stability properties of these black branes are divulged from the positivity of principle minors of the space-state metric tensor. We have explicitly analyzed the state-space configurations for (i) the two and three charge extremal black holes, (ii) the four and six charge non-extremal black branes, which both arise from the string theory solutions. An extension is considered for the $D_6$-$D_4$-$D_2$-$D_0$ multi-centered black branes, fractional small black branes and two charge rotating fuzzy rings in the setup of Mathur's fuzzball configurations. The state-space pair correlations and nature of stabilities have been investigated for three charged bubbling black brane foams, and thereby the M-theory solutions are brought into the present consideration. In the case of extremal black brane configurations, we have pointed out that the ratio of diagonal space-state correlations varies as inverse square of the chosen parameters, while the off diagonal components vary as inverse of the chosen parameters. We discuss the significance of this observation for the non-extremal black brane configurations, and find similar conclusion that the state-space correlations extenuate as the chosen parameters are increased. \\ ( http://arxiv.org/abs/0910.5309 , 47kb) ------------------------------------------------------------------------------ \\ arXiv:0910.5314 Date: Wed, 28 Oct 2009 09:25:06 GMT (152kb) Title: An Exact Fluctuating 1/2-BPS Configuration Authors: Stefano Bellucci and Bhupendra Nath Tiwari Categories: hep-th Comments: 29 pages, 4 figures, PACS numbers: 04.70.-s: Physics of black holes; 04.70.-Bw: Classical black holes; 04.50.Gh Higher-dimensional black holes, black strings, and related objects; 04.60.Cf Gravitational aspects of string theory \\ This work explores the role of thermodynamic fluctuations in the two parameter giant and superstar configurations characterized by an ensemble of arbitrary liquid droplets or irregular shaped fuzzballs. Our analysis illustrates that the chemical and state-space geometric descriptions exhibit an intriguing set of exact pair correction functions and the global correlation lengths. The first principle of statistical mechanics shows that the possible canonical fluctuations may precisely be ascertained without any approximation. Interestingly, our intrinsic geometric study exemplifies that there exist exact fluctuating 1/2-BPS statistical configurations which involve an ensemble of microstates describing the liquid droplets or fuzzballs. The Gaussian fluctuations over an equilibrium chemical and state-space configurations accomplish a well-defined, non-degenerate, curved and regular intrinsic Riemannian manifolds for all physically admissible domains of black hole parameters. An explicit computation demonstrates that the underlying chemical correlations involve ordinary summations, whilst the state-space correlations may simply be depicted by standard polygamma functions. Our construction ascribes definite stability character to the canonical energy fluctuations and to the counting entropy associated with an arbitrary choice of excited boxes from an ensemble of ample boxes constituting a variety of Young tableaux. \\ ( http://arxiv.org/abs/0910.5314 , 152kb) ------------------------------------------------------------------------------ \\ arXiv:0910.5315 Date: Wed, 28 Oct 2009 09:29:51 GMT (22kb) Title: Scattering of Giant Magnons in CP^3 Authors: Yasuyuki Hatsuda, Hiroaki Tanaka Categories: hep-th Comments: 29 pages Report-no: RIKEN-TH-172, UT-09-21 \\ We study classical scattering phase of CP^2 dyonic giant magnons in R_t x CP^3. We construct two-soliton solutions explicitly by the dressing method. Using these solutions, we compute the classical time delays for the scattering of giant magnons, and compare them to boundstate S-matrix elements derived from the conjectured AdS_4/CFT_3 S-matrix by Ahn and Nepomechie in the strong coupling limit. Our result is consistent with the conjectured S-matrix. The dyonic solutions play an essential role in revealing the polarization dependence of scattering phase. \\ ( http://arxiv.org/abs/0910.5315 , 22kb) ------------------------------------------------------------------------------ \\ arXiv:0910.5338 Date: Wed, 28 Oct 2009 10:54:39 GMT (21kb) Title: Interactions of Massless Higher Spin Fields From String Theory Authors: Dimitri Polyakov Categories: hep-th Comments: 33 pages Report-no: WITS-CTP-043 \\ We construct vertex operators for massless higher spin fields in RNS superstring theory and compute some of their three-point correlators, describing gauge-invariant cubic interactions of the massless higher spins. The Fierz-Pauli on-shell conditions for the higher spins (including tracelessness and vanishing divergence) follow from the BRST-invariance conditions for the vertex operators constructed in this paper. The gauge symmetries of the massless higher spins emerge as a result of the BRST nontriviality conditions for these operators, being isomorphic to transformations with the traceless gauge parameter in the Fronsdal's approach. The gauge invariance of the interaction terms of the higher spins is therefore ensured automatically by that of the vertex operators in string theory. We develop general algorithm to compute the cubic interactions of the massless higher spins and use it to explicitly describe the gauge-invariant interaction of two $s=3$ and one $s=4$ massless particles. \\ ( http://arxiv.org/abs/0910.5338 , 21kb) ------------------------------------------------------------------------------ \\ arXiv:0910.5347 Date: Wed, 28 Oct 2009 19:59:54 GMT (26kb) Title: AdS_7/CFT_6, Gauss-Bonnet Gravity, and Viscosity Bound Authors: Jan de Boer, Manuela Kulaxizi, and Andrei Parnachev Categories: hep-th Comments: 21 page, harvmac \\ We study the relation between the causality and the positivity of energy bounds in Gauss-Bonnet gravity in AdS_7 background and find a precise agreement. Requiring the group velocity of metastable states to be bounded by the speed of light places a bound on the value of Gauss-Bonnet coupling. To find the positivity of energy constraints we compute the parameters which determine the angular distribution of the energy flux in terms of three independent coefficients specifying the three-point function of the stress-energy tensor. We then relate the latter to the Weyl anomaly of the six-dimensional CFT and compute the anomaly holographically. The resulting upper bound on the Gauss-Bonnet coupling coincides with that from causality and results in a new bound on viscosity/entropy ratio. \\ ( http://arxiv.org/abs/0910.5347 , 26kb) ------------------------------------------------------------------------------ \\ arXiv:0910.5351 Date: Wed, 28 Oct 2009 11:29:55 GMT (252kb) Title: Covariant boost and structure functions of baryons in Gross-Neveu models Authors: Wieland Brendel, Michael Thies Categories: hep-th Comments: 13 pages, 12 figures \\ Baryons in the large N limit of two-dimensional Gross-Neveu models are reconsidered. The time-dependent Dirac-Hartree-Fock approach is used to boost a baryon to any inertial frame and shown to yield the covariant energy-momentum relation. Momentum distributions are computed exactly in arbitrary frames and used to interpolate between the rest frame and the infinite momentum frame, where they are related to structure functions. Effects from the Dirac sea depend sensitively on the occupation fraction of the valence level and the bare fermion mass and do not vanish at infinite momentum. In the case of the kink baryon, they even lead to divergent quark and antiquark structure functions at x=0. \\ ( http://arxiv.org/abs/0910.5351 , 252kb) ------------------------------------------------------------------------------ \\ arXiv:0910.5388 Date: Wed, 28 Oct 2009 15:12:21 GMT (10kb) Title: Superconducting Source of the Kerr-Newman Electron Authors: Alexander Burinskii Categories: hep-th Comments: 3p. 1 figure, talk at DSPIN-09 Conference (Dubna) \\ Regular superconducting solution for interior of the Kerr-Newman (KN) spinning particle is obtained. For parameters of electron it represents the highly oblated rotating bubble filled by the oscillating Higgs field which expels the electromagnetic (em) field and currents to boundary of the bubble. The external em and gravitational fields correspond exactly to Kerr-Newman solution, while the interior forms a `false' vacuum with nonzero vev, flat metric and zero energy density. Vortex of the Kerr-Newman em field forms a quantum loop in equatorial plane of the rotating disk-like bubble. \\ ( http://arxiv.org/abs/0910.5388 , 10kb) ------------------------------------------------------------------------------ \\ arXiv:0910.5390 Date: Wed, 28 Oct 2009 14:43:27 GMT (212kb) Title: On the scheme dependence of gravitational beta functions Authors: Gaurav Narain, Roberto Percacci Categories: hep-th Comments: 14 pages, 4 figures. To appear in Acta Physica Polonica. Proceedings of the 49-th Cracow School of Theoretical Physics, "Non-perturbative Gravity and Quantum Chromodynamics", May 31-June 10, 2009 Report-no: pi-partphys-149 \\ We discuss the arbitrariness in the choice of cutoff scheme in calculations of beta functions. We define a class of "pure" cutoff schemes, in which the cutoff is completely independent of the parameters that appear in the action. In a sense they are at the opposite extreme of the "spectrally adjusted" cutoffs, which depend on all the parameters that appear in the action. We compare the results for the beta functions of Newton's constant and of the cosmological constant obtained with a typical cutoff and with a pure cutoff, keeping all else fixed. We find that the dependence of the fixed point on an arbitrary parameter in the pure cutoff is rather mild. We then show in general that if a spectrally adjusted cutoff produces a fixed point, there is a corresponding pure cutoff that will give a fixed point in the same position. \\ ( http://arxiv.org/abs/0910.5390 , 212kb) ------------------------------------------------------------------------------ \\ arXiv:0910.5401 Date: Wed, 28 Oct 2009 16:51:34 GMT (55kb) Title: The Effective Potential of the Conformal Factor in Asymptotically Safe Quantum Gravity Authors: Jan-Eric Daum and Martin Reuter Categories: hep-th Comments: 15 pages, 1 figure, talk given by Jan-Eric Daum at CLAQG08 \\ The effective potential of the conformal factor in the effective average action approach to Quantum Einstein Gravity is discussed. It is shown, without invoking any truncation or other approximations, that if the theory has has a non-Gaussian ultraviolet fixed point and is asymptotically safe the potential has a characteristic behavior near the origin. This behavior might be observable in numerical simulations. \\ ( http://arxiv.org/abs/0910.5401 , 55kb) ------------------------------------------------------------------------------ \\ arXiv:0910.5441 Date: Wed, 28 Oct 2009 17:28:58 GMT (10kb) Title: Domain Walls on Singularities Authors: Edi Halyo Categories: hep-th Comments: 16 pages in phyzzx.tex \\ We describe domain walls that live on $A_2$ and $A_3$ singularities. The walls are BPS if the singularity is resolved and non--BPS if it is deformed and fibered. We show that these domain walls may interpolate between vacua that support monopoles and/or vortices. \\ ( http://arxiv.org/abs/0910.5441 , 10kb) ------------------------------------------------------------------------------ \\ arXiv:0910.5457 Date: Wed, 28 Oct 2009 18:35:54 GMT (104kb) Title: Skyrmion Multi-Walls Authors: J. Silva Lobo and R. S. Ward Categories: hep-th Comments: 7 pages, 1 figure Report-no: DCPT-09/79 \\ Skyrmion walls are topologically-nontrivial solutions of the Skyrme system which are periodic in two spatial directions. We report numerical investigations which show that solutions representing parallel multi-walls exist. The most stable configuration is that of the square $N$-wall, which in the $N\to\infty$ limit becomes the cubically-symmetric Skyrme crystal. There is also a solution resembling parallel hexagonal walls, but this is less stable. \\ ( http://arxiv.org/abs/0910.5457 , 104kb) ------------------------------------------------------------------------------ \\ arXiv:0910.5464 Date: Wed, 28 Oct 2009 19:07:36 GMT (196kb,D) Title: A Three-Generation Calabi-Yau Manifold with Small Hodge Numbers Authors: Volker Braun, Philip Candelas, Rhys Davies Categories: hep-th Comments: PDFLaTeX. 50 pages, 9 figures, 7 tables Report-no: DIAS-STP 09-09 \\ We present a complete intersection Calabi-Yau manifold Y that has Euler number -72 and which admits free actions by two groups of automorphisms of order 12. These are the cyclic group Z_12 and the non-Abelian dicyclic group Dic_3. The quotient manifolds have chi=-6 and Hodge numbers (h^11,h^21)=(1,4). With the standard embedding of the spin connection in the gauge group, Y gives rise to an E_6 gauge theory with 3 chiral generations of particles. The gauge group may be broken further by means of the Hosotani mechanism combined with continuous deformation of the background gauge field. For the non-Abelian quotient we obtain a model with 3 generations with the gauge group broken to that of the standard model. Moreover there is a limit in which the quotients develop 3 conifold points. These singularities may be resolved simultaneously to give another manifold with (h^11,h^21)=(2,2) that lies right at the tip of the distribution of Calabi-Yau manifolds. This strongly suggests that there is a heterotic vacuum for this manifold that derives from the 3 generation model on the quotient of Y. The manifold Y may also be realised as a hypersurface in the toric variety. The symmetry group does not act torically, nevertheless we are able to identify the mirror of the quotient manifold by adapting the construction of Batyrev. \\ ( http://arxiv.org/abs/0910.5464 , 196kb) %-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%- ------------------------------------------------------------------------------ \\ arXiv:0910.2510 (*cross-listing*) Date: Wed, 14 Oct 2009 01:23:50 GMT (519kb) Title: To what extent is the entropy-area law universal ? -- Multi-horizon and multi-temperature spacetime may break the entropy-area law -- Authors: Hiromi Saida Categories: gr-qc hep-th Comments: 39 pages in PTP format, 3 figures, Accepted for publication in Prog.Theor.Phys \\ It seems to be a common understanding at present that, once event horizons are in thermal equilibrium, the entropy-area law holds inevitably. However no rigorous verification is given to such a very strong universality of the law in multi-horizon spacetimes. Then, based on thermodynamically consistent and rigorous discussion, this paper suggests an evidence of breakdown of entropy-area law for horizons in Schwarzschild-de Sitter spacetime, in which the temperatures of the horizons are different. The outline is as follows: We construct carefully "two thermal equilibrium systems" individually for black hole event horizon (BEH) and cosmological event horizon (CEH), for which the Euclidean action method is applicable. The integration constant (subtraction term) in Euclidean action is determined with referring to Schwarzschild and de Sitter canonical ensembles. The free energies of the two thermal systems are functions of three independent state variables, and we find a similarity of our two thermal systems with the magnetized gas in laboratory, which gives us a physical understanding of the necessity of three independent state variables. Then, via the thermodynamic consistency with three independent state variables, the breakdown of entropy-area law for CEH is suggested. The validity of the law for BEH can not be judged, but we clarify the key issue for BEH's entropy. Finally we make comments which may suggest the breakdown of entropy-area law for BEH, and also propose two discussions; one of them is on the quantum statistics of underlying quantum gravity, and another is on the SdS black hole evaporation from the point of view of non-equilibrium thermodynamics. \\ ( http://arxiv.org/abs/0910.2510 , 519kb) ------------------------------------------------------------------------------ \\ arXiv:0910.3653 (*cross-listing*) Date: Mon, 19 Oct 2009 19:21:52 GMT (170kb) Title: On soft singularities at three loops and beyond Authors: Lance J. Dixon, Einan Gardi, Lorenzo Magnea Categories: hep-ph hep-th Comments: 36 pages, 3 figures Report-no: SLAC-PUB-13816, Edinburgh 08/2009, DFTT 69/2009 \\ We report on further progress in understanding soft singularities of massless gauge theory scattering amplitudes. Recently, a set of equations was derived based on Sudakov factorization, constraining the soft anomalous dimension matrix of multi-leg scattering amplitudes to any loop order, and relating it to the cusp anomalous dimension. The minimal solution to these equations was shown to be a sum over color dipoles. Here we explore potential contributions to the soft anomalous dimension that go beyond the sum-over-dipoles formula. Such contributions are constrained by factorization and invariance under rescaling of parton momenta to be functions of conformally invariant cross ratios. Therefore, they must correlate the color and kinematic degrees of freedom of at least four hard partons, corresponding to gluon webs that connect four eikonal lines, which first appear at three loops. We analyze potential contributions, combining all available constraints, including Bose symmetry, the expected degree of transcendentality, and the singularity structure in the limit where two hard partons become collinear. We find that if the kinematic dependence is solely through products of logarithms of cross ratios, then at three loops there is a unique function that is consistent with all available constraints. If polylogarithms are allowed to appear as well, then at least two additional structures are consistent with the available constraints. \\ ( http://arxiv.org/abs/0910.3653 , 170kb) ------------------------------------------------------------------------------ \\ arXiv:0910.4585 (*cross-listing*) Date: Fri, 23 Oct 2009 20:10:16 GMT (115kb) Title: Superconformal Flavor Simplified Authors: David Poland and David Simmons-Duffin Categories: hep-ph hep-th Comments: 43 pages, 1 figure \\ A simple explanation of the flavor hierarchies can arise if matter fields interact with a conformal sector and different generations have different anomalous dimensions under the CFT. However, in the original study by Nelson and Strassler many supersymmetric models of this type were considered to be 'incalculable' because the R-charges were not sufficiently constrained by the superpotential. We point out that nearly all such models are calculable with the use of a-maximization. Utilizing this, we construct the simplest vector-like flavor models and discuss their viability. A significant constraint on these models comes from requiring that the visible gauge couplings remain perturbative throughout the conformal window needed to generate the hierarchies. However, we find that there is a small class of simple flavor models that can evade this bound. \\ ( http://arxiv.org/abs/0910.4585 , 115kb) ------------------------------------------------------------------------------ \\ arXiv:0910.4756 (*cross-listing*) Date: Sun, 25 Oct 2009 17:37:27 GMT (15kb) Title: The Volume of the Past Light-Cone and the Paneitz Operator Authors: Sohyun Park and R.P. Woodard (University of Florida) Categories: gr-qc astro-ph.CO hep-th Comments: 22 pages, no figures, 5 tables Report-no: UFIFT-QG-09-07 \\ We study a conjecture involving the invariant volume of the past light-cone from an arbitrary observation point back to a fixed initial value surface. The conjecture is that a 4th order differential operator which occurs in the theory of conformal anomalies gives $8\pi$ when acted upon the invariant volume of the past light-cone. We show that the conjecture is valid for an arbitrary homogeneous, isotropic and spatially flat geometry. First order perturbation theory about flat spacetime reveals a violation of the conjecture which, however, vanishes for any vacuum solution of the Einstein equation. These results may be significant for constructing quantum gravitational observables, for quantifying the the back-reaction on spacetime expansion and for alternate gravity models which feature a timelike vector field. \\ ( http://arxiv.org/abs/0910.4756 , 15kb) %%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%% ------------------------------------------------------------------------------ \\ arXiv:0712.1223 replaced with revised version Wed, 28 Oct 2009 10:22:19 GMT (230kb) Title: Conformal Ward identities for Wilson loops and a test of the duality with gluon amplitudes Authors: J.M.Drummond, J.Henn, G.P.Korchemsky, E.Sokatchev Categories: hep-th hep-ph Comments: 28 pages, 5 figures. Published version Report-no: LAPTH-1224/07, LPT-Orsay-07-133 \\ ( http://arxiv.org/abs/0712.1223 , 230kb) ------------------------------------------------------------------------------ \\ arXiv:0812.2315 replaced with revised version Wed, 28 Oct 2009 00:46:37 GMT (114kb) Title: The Hilbert Series of Adjoint SQCD Authors: Amihay Hanany, Noppadol Mekareeya and Giuseppe Torri Categories: hep-th Comments: 53 pages, 1 figure and 2 tables. Version 2: Section 4.4.1 added, Section 4.4 improved, typos fixed, published in Nuclear Physics B Report-no: Imperial/TP/08/AH/11 Journal-ref: Nuclear Physics, Section B 825 (2010), pp. 52-97 DOI: 10.1016/j.nuclphysb.2009.09.016 \\ ( http://arxiv.org/abs/0812.2315 , 114kb) ------------------------------------------------------------------------------ \\ arXiv:0905.1962 replaced with revised version Wed, 28 Oct 2009 16:03:17 GMT (61kb) Title: Self-accelerating the normal DGP branch Authors: Mariam Bouhmadi-Lopez Categories: hep-th Comments: 9 pages, 2 figures, RevTeX 4. References added. Version to appear in JCAP \\ ( http://arxiv.org/abs/0905.1962 , 61kb) ------------------------------------------------------------------------------ \\ arXiv:0905.4352 replaced with revised version Wed, 28 Oct 2009 14:13:46 GMT (431kb) Title: Gravity & Hydrodynamics: Lectures on the fluid-gravity correspondence Authors: Mukund Rangamani Categories: hep-th gr-qc physics.flu-dyn Comments: 60 pages, 3 eps figures. v2: added refs. v3: corrected typos Report-no: DCPT-09/33, NSF-KITP-09-65 \\ ( http://arxiv.org/abs/0905.4352 , 431kb) ------------------------------------------------------------------------------ \\ arXiv:0907.0803 replaced with revised version Wed, 28 Oct 2009 08:18:35 GMT (229kb,D) Title: Oblique DLCQ M-theory and Multiple M2-branes Authors: Jin-Ho Cho, Sunyoung Shin Categories: hep-th Comments: v3: 25pages, extended version, References added \\ ( http://arxiv.org/abs/0907.0803 , 229kb) ------------------------------------------------------------------------------ \\ arXiv:0908.3149 replaced with revised version Wed, 28 Oct 2009 06:40:29 GMT (175kb,D) Title: The Unruh thermal spectrum through scalar and fermion tunneling Authors: Debraj Roy Categories: hep-th gr-qc Comments: pdftex 1.40.9, 7 pages, 1 pdf figure; Journal version - Some typos fixed and explanatory remarks added Journal-ref: Phys.Lett.B681:185,2009 DOI: 10.1016/j.physletb.2009.09.066 \\ ( http://arxiv.org/abs/0908.3149 , 175kb) ------------------------------------------------------------------------------ \\ arXiv:0908.3713 replaced with revised version Wed, 28 Oct 2009 12:50:31 GMT (641kb) Title: Walls in supersymmetric massive nonlinear sigma model on complex quadric surface Authors: Masato Arai, Sunggeun Lee, Sunyoung Shin Categories: hep-th Comments: 42 pages, 30 figures, typos corrected, to appear in PRD \\ ( http://arxiv.org/abs/0908.3713 , 641kb) ------------------------------------------------------------------------------ \\ arXiv:0909.0614 replaced with revised version Wed, 28 Oct 2009 08:59:26 GMT (824kb) Title: Magnetic properties of holographic multiquarks in the quark-gluon plasma Authors: Piyabut Burikham Categories: hep-th Comments: 17 pages, 8 figures, revised version with significant changes \\ ( http://arxiv.org/abs/0909.0614 , 824kb) ------------------------------------------------------------------------------ \\ arXiv:0909.1999 (*cross-listing*) replaced with revised version Wed, 28 Oct 2009 08:38:33 GMT (969kb,D) Title: Entanglement entropy of excited states Authors: Vincenzo Alba, Maurizio Fagotti, Pasquale Calabrese Categories: cond-mat.stat-mech cond-mat.str-el hep-th quant-ph Comments: 37 pages, 10 figures Journal-ref: J. Stat. Mech. (2009) P10020 DOI: 10.1088/1742-5468/2009/10/P10020 \\ ( http://arxiv.org/abs/0909.1999 , 969kb) ------------------------------------------------------------------------------ \\ arXiv:0910.2387 replaced with revised version Wed, 28 Oct 2009 01:08:51 GMT (15kb) Title: Generalized Misner-Sharp Energy in f(R) Gravity Authors: Rong-Gen Cai, Li-Ming Cao, Ya-Peng Hu, Nobuyoshi Ohta Categories: hep-th gr-qc Comments: Revtex, 17 pages, v2: some references added, to appear in PRD Report-no: KU-TP 036 \\ ( http://arxiv.org/abs/0910.2387 , 15kb) ------------------------------------------------------------------------------ \\ arXiv:0910.4630 replaced with revised version Wed, 28 Oct 2009 10:33:05 GMT (25kb) Title: Reciprocity and integrability in the sl(2) sector of N=4 SYM Authors: Matteo Beccaria and Guido Macorini Categories: hep-th Comments: 27 pages, improved bibliography \\ ( http://arxiv.org/abs/0910.4630 , 25kb) ------------------------------------------------------------------------------ \\ arXiv:0910.4766 replaced with revised version Wed, 28 Oct 2009 02:26:14 GMT (7kb) Title: Doubling of background solution in 5D stabilized brane world model Authors: Mikhail N. Smolyakov Categories: hep-th Comments: 7 pages, LaTeX, typos corrected \\ ( http://arxiv.org/abs/0910.4766 , 7kb) %%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%--- 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. Author self-submissions are exceedingly preferred. E-mail submissions have been discontinued in favor of better support for Web submissions. See http://arXiv.org/help/uploads