Date: Thu, 28 Aug 14 00:15:46 GMT Subject: hep-th daily 13 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 26 Aug 14 20:00:00 GMT to Wed 27 Aug 14 20:00:00 GMT ------------------------------------------------------------------------------ \\ arXiv:1408.6246 Date: Tue, 26 Aug 2014 20:21:03 GMT (25kb) Title: Planck Constant as Spectral Parameter in Integrable Systems and KZB Equations Authors: A. Levin, M. Olshanetsky, A. Zotov Categories: hep-th math-ph math.MP math.RT nlin.SI Comments: 26 pages \\ We construct special rational ${\rm gl}_N$ Knizhnik-Zamolodchikov-Bernard (KZB) equations with $\tilde N$ punctures by deformation of the corresponding quantum ${\rm gl}_N$ rational $R$-matrix. They have two parameters. The limit of the first one brings the model to the ordinary rational KZ equation. Another one - is $\tau$. At the level of classical mechanics the deformation parameter $\tau$ allows to extend the previously obtained modified Gaudin models to the modified Schlesinger systems. Next, we notice that the identities underlying generic (elliptic) KZB equations follow from some additional relations for the properly normalized $R$-matrices. The relations are noncommutative analogues of identities for (scalar) elliptic functions. The simplest one is the unitarity condition. The quadratic (in $R$ matrices) relations are generated by noncommutative Fay identities. In particular, one can derive the quantum Yang-Baxter equations from the Fay identities. The cubic relations provide identities for the KZB equations as well as quadratic relations for the classical $r$-matrices which can be treated as halves of the classical Yang-Baxter equation. At last we discuss the $R$-matrix valued linear problems which provide ${\rm gl}_{\tilde N}$ CM models and Painlev\'e equations via the above mentioned identities. The role of the spectral parameter plays the Planck constant of the quantum $R$-matrix. When the quantum ${\rm gl}_N$ $R$-matrix is scalar ($N=1$) the linear problem reproduces the Krichever's ansatz for the Lax matrices with spectral parameter for the ${\rm gl}_{\tilde N}$ CM models. The linear problems for the quantum CM models generalize the KZ equations in the same way as the Lax pairs with spectral parameter generalizes those without it. \\ ( http://arxiv.org/abs/1408.6246 , 25kb) ------------------------------------------------------------------------------ \\ arXiv:1408.6293 Date: Wed, 27 Aug 2014 02:05:21 GMT (210kb) Title: Turbulent meson condensation in quark deconfinement Authors: Koji Hashimoto, Shunichiro Kinoshita, Keiju Murata, Takashi Oka Categories: hep-th cond-mat.str-el hep-ph nucl-th Comments: 5 pages, 5 figures Report-no: AP-GR-114, OCU-PHYS-409, OU-HET-821, RIKEN-MP-93 \\ In a QCD-like strongly coupled gauge theory at large N_c, using the AdS/CFT correspondence, we find that heavy quark deconfinement is accompanied by a coherent condensation of higher meson resonances. This is revealed in non-equilibrium deconfinement transitions triggered by static, as well as, quenched electric fields even below the Schwinger limit. There, we observe a "turbulent" energy flow to higher meson modes, which finally results in the quark deconfinement. Our observation is consistent with seeing deconfinement as a condensation of long QCD strings. \\ ( http://arxiv.org/abs/1408.6293 , 210kb) ------------------------------------------------------------------------------ \\ arXiv:1408.6300 Date: Wed, 27 Aug 2014 02:48:15 GMT (4381kb,D) Title: Causality & holographic entanglement entropy Authors: Matthew Headrick, Veronika E. Hubeny, Albion Lawrence, Mukund Rangamani Categories: hep-th gr-qc Comments: 42 pages, 11 figures Report-no: DCPT-14/33, BRX-TH-6284 \\ We identify conditions for the entanglement entropy as a function of spatial region to be compatible with causality in an arbitrary relativistic quantum field theory. We then prove that the covariant holographic entanglement entropy prescription (which relates entanglement entropy of a given spatial region on the boundary to the area of a certain extremal surface in the bulk) obeys these conditions, as long as the bulk obeys the null energy condition. While necessary for the validity of the prescription, this consistency requirement is quite nontrivial from the bulk standpoint, and therefore provides important additional evidence for the prescription. In the process, we introduce a codimension-zero bulk region, named the entanglement wedge, naturally associated with the given boundary spatial region. We propose that the entanglement wedge is the most natural bulk region corresponding to the boundary reduced density matrix. \\ ( http://arxiv.org/abs/1408.6300 , 4381kb) ------------------------------------------------------------------------------ \\ arXiv:1408.6318 Date: Wed, 27 Aug 2014 06:00:23 GMT (17kb) Title: Observables for identity-based tachyon vacuum solutions Authors: Isao Kishimoto, Toru Masuda, Tomohiko Takahashi Categories: hep-th Comments: 20 pages \\ We consider a modified KBc algebra in bosonic open string field theory expanded around identity-based scalar solutions. By use of the algebra, classical solutions on the background are constructed and observables for them, including energy densities and gauge invariant overlaps, are calculable. These results are applied to evaluate observables analytically for both of the identity-based trivial pure gauge solution and the identity-based tachyon vacuum solution. \\ ( http://arxiv.org/abs/1408.6318 , 17kb) ------------------------------------------------------------------------------ \\ arXiv:1408.6319 Date: Wed, 27 Aug 2014 06:02:20 GMT (211kb) Title: Comments on Takahashi-Tanimoto's scalar solution Authors: Nobuyuki Ishibashi Categories: hep-th Comments: 24 pages, 4 figures Report-no: UTHEP-663 \\ We study the identity-based solution of Witten's cubic bosonic open string field theory constructed by Takahashi and Tanimoto, which is claimed to describe the tachyon vacuum. We argue that the observables of the solution coincide with those of the tachyon vacuum using the method proposed by Kishimoto and Takahashi. We also discuss how to treat the kinetic term of the string field theory expanded around it. \\ ( http://arxiv.org/abs/1408.6319 , 211kb) ------------------------------------------------------------------------------ \\ arXiv:1408.6361 Date: Wed, 27 Aug 2014 09:28:45 GMT (1024kb,D) Title: Chiral Magnetic Effect in the Anisotropic Quark-Gluon Plasma Authors: Mohammad Ali-Akbari, Seyed Farid Taghavi Categories: hep-th Comments: 17 pages, 5 figures \\ An anisotropic thermal plasma phase of a strongly coupled gauge theory can be holographically modelled by an anisotropic AdS black hole. The temperature and anisotropy parameter of the AdS black hole background of interest [1] is specified by the location of the horizon and the value of the Dilaton field at the horizon. Interestingly, for the first time, we obtain two functions for the values of the horizon and Dilaton field in terms of the temperature and anisotropy parameter. Then by introducing a number of spinning probe D7-branes in the anisotropic background, we compute the value of the chiral magnetic effect (CME). We observe that in the isotropic and anisotropic plasma the value of the CME is equal for the massless quarks. However, at fixed temperature, raising the anisotropy in the system will increase the value of the CME for the massive quarks. \\ ( http://arxiv.org/abs/1408.6361 , 1024kb) ------------------------------------------------------------------------------ \\ arXiv:1408.6380 Date: Wed, 27 Aug 2014 10:51:07 GMT (176kb,D) Title: Higher-curvature corrections to holographic entanglement entropy in geometries with hyperscaling violation Authors: Pablo Bueno and Pedro F. Ramirez Categories: hep-th Comments: 31+1 pages, 3 figures \\ We study the effects of including higher-curvature corrections to the Einstein gravity bulk action on the holographic entanglement entropy (HEE) expression for geometries with hyperscaling violation (hvLf). For $\theta< 0$ we show that one single new divergence arises for general curvature-squared gravities, which allows us to conjecture the general expression of HEE for any higher-order gravity action. For $0<\theta