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Low-energy modes in anisotropic holographic fluids
https://repo.scoap3.org/record/30764
In this work we will study the low-energy collective behavior of spatially anisotropic dense fluids in four spacetime dimensions. We will embed a massless flavor D7-brane probe in a generic geometry which has a metric possessing anisotropy in the spatial components. We work out generic formulas of the low-energy excitation spectra and two-point functions for charged excitations at finite baryon chemical potential. In addition, we specialize to a certain Lifshitz geometry and discuss in great detail the scaling behavior of several different quantities.Itsios, GeorgiosSat, 02 Feb 2019 07:59:11 GMThttps://repo.scoap3.org/record/30764urn:ISSN:0550-3213Elsevier2019-03Penrose limits of Abelian and non-Abelian T-duals of AdS 5 × S 5 and their field theory duals
https://repo.scoap3.org/record/23164
We consider the backgrounds obtained by Abelian and non-Abelian T-duality applied on AdS 5 × S 5 . We study geodesics, calculate Penrose limits and find the associated plane-wave geometries. We quantise the weakly coupled type-IIA string theory on these backgrounds. We study the BMN sector, finding operators that wrap the original quiver CFT. For the non-Abelian plane wave, we find a ‘flow’ in the frequencies. We report some progress to understand this, in terms of deconstruction of a higher dimensional field theory. We explore a relation with the plane-wave limit of the Janus solution, which we also provide.Itsios, GeorgiosThu, 18 Jan 2018 15:41:52 GMThttps://repo.scoap3.org/record/23164urn:ISSN:1029-8479Springer/SISSA2018-01-16Penrose limits and spin chains in the GJV/CS-SYM duality
https://repo.scoap3.org/record/22915
We examine Penrose limits of the duality proposed by Guarino, Jafferis and Varela between a type IIA massive background of the type of a warped, squashed AdS 4 × S 6 , and a 2+1 dimensional IR fixed point of N = 8 $$ \mathcal{N}=8 $$ super Yang-Mills deformed by Chern-Simons terms to N = 2 $$ \mathcal{N}=2 $$ supersymmetry. One type of Penrose limit for closed strings corresponds to a large charge closed spin chain, and another, for open strings on giant graviton D-branes, corresponds to an open spin chain on sub-determinant operators. For the first limit, we find that like in the ABJM case, there are functions f a ( λ ) that interpolate between the perturbative and nonperturbative (string) regions for the magnon energy. For the second, we are unable to match the gravity result with the expected field theory result, making this model more interesting than ones with more supersymmetry.Araujo, ThiagoFri, 29 Dec 2017 12:03:19 GMThttps://repo.scoap3.org/record/22915urn:ISSN:1029-8479Springer/SISSA2017-12-27The AdS 5 non-Abelian T-dual of Klebanov-Witten as a N = 1 $$ \mathcal{N}=1 $$ linear quiver from M5-branes
https://repo.scoap3.org/record/21463
In this paper we study an AdS 5 solution constructed using non-Abelian T-duality, acting on the Klebanov-Witten background. We show that this is dual to a linear quiver with two tails of gauge groups of increasing rank. The field theory dynamics arises from a D4-NS5-NS5’ brane set-up, generalizing the constructions discussed by Bah and Bobev. These realize N = 1 $$ \mathcal{N}=1 $$ quiver gauge theories built out of N = 1 $$ \mathcal{N}=1 $$ and N = 2 $$ \mathcal{N}=2 $$ vector multiplets flowing to interacting fixed points in the infrared. We compute the central charge using a -maximization, and show its precise agreement with the holographic calculation. Our result exhibits n 3 scaling with the number of five-branes. This suggests an eleven-dimensional interpretation in terms of M5-branes, a generic feature of various AdS backgrounds obtained via non-Abelian T-duality.Itsios, GeorgiosTue, 12 Sep 2017 06:27:25 GMThttps://repo.scoap3.org/record/21463urn:ISSN:1029-8479Springer/SISSA2017-09-11Baryon superfluids in AdS/CFT with flavor
https://repo.scoap3.org/record/18811
Baryonic matter is notoriously difficult to deal with in the large-N limit, as baryons become operators of very large dimension with N fields in the fundamental representation. This issue is also present in gauge/gravity duals as baryons are described by very heavy localized objects. There are however alternative large-N extrapolations of QCD where small baryonic operators exist and can be treated on an equal footing to mesons. We explore the possibility of turning on a finite density of “light” baryons in a theory with a hadronic mass gap using a gauge/gravity construction based on the D3/D7 intersection. We find a novel phase with spontaneous breaking of baryon symmetry at zero temperature.Hoyos, CarlosWed, 01 Feb 2017 15:08:34 GMThttps://repo.scoap3.org/record/18811urn:ISSN:1029-8479Springer/SISSA2017-01-31Mesons from (non) Abelian T-dual backgrounds
https://repo.scoap3.org/record/18509
In this work we study mesonic excitations in a Quantum Field Theory dual to the non Abelian T-dual of AdS 5 × S 5 , using a D 6 brane probe on the Sfetsos-Thompson background. Before and after the duality, we observe interesting differences between the spectra and interpret them. The spectrum of masses and the interactions between mesonic excitations teach valuable lessons about the character of non-Abelian T-duality and its implications for Holography. The case of Abelian T-duality is also studied.Itsios, GeorgiosWed, 04 Jan 2017 14:17:47 GMThttps://repo.scoap3.org/record/18509urn:ISSN:1029-8479Springer/SISSA2017-01-03Collective excitations of massive flavor branes
https://repo.scoap3.org/record/15951
We study the intersections of two sets of D-branes of different dimensionalities. This configuration is dual to a supersymmetric gauge theory with flavor hypermultiplets in the fundamental representation of the gauge group which live on the defect of the unflavored theory determined by the directions common to the two types of branes. One set of branes is dual to the color degrees of freedom, while the other set adds flavor to the system. We work in the quenched approximation, i.e. , where the flavor branes are considered as probes, and focus specifically on the case in which the quarks are massive. We study the thermodynamics and the speeds of first and zero sound at zero temperature and non-vanishing chemical potential. We show that the system undergoes a quantum phase transition when the chemical potential approaches its minimal value and we obtain the corresponding non-relativistic critical exponents that characterize its critical behavior. In the case of (2+1) -dimensional intersections, we further study alternative quantization and the zero sound of the resulting anyonic fluid. We finally extend these results to non-zero temperature and magnetic field and compute the diffusion constant in the hydrodynamic regime. The numerical results we find match the predictions by the Einstein relation.Itsios, GeorgiosThu, 09 Jun 2016 13:48:13 GMThttps://repo.scoap3.org/record/15951urn:ISSN:0550-3213Elsevier2017-03-15Cold holographic matter in the Higgs branch
https://repo.scoap3.org/record/10542
We study collective excitations of cold (2+1) -dimensional fundamental matter living on a defect of the four-dimensional N=4 super Yang–Mills theory in the Higgs branch. This system is realized holographically as a D3–D5 brane intersection, in which the D5-brane is treated as a probe with a non-zero gauge flux across the internal part of its worldvolume. We study the holographic zero sound mode in the collisionless regime at low temperature and find a simple analytic result for its dispersion relation. We also find the diffusion constant of the system in the hydrodynamic regime at higher temperature. In both cases we study the dependence on the flux parameter which determines the amount of Higgs symmetry breaking. We also discuss the anyonization of this construction.Itsios, GeorgiosTue, 02 Jun 2015 15:13:08 GMThttps://repo.scoap3.org/record/10542urn:ISSN:0370-2693Elsevier2016-05-28Compactifications of the Klebanov-Witten CFT and new AdS 3 backgrounds
https://repo.scoap3.org/record/10292
In this paper we find various new backgrounds in Type IIB, IIA and M-theory with an AdS 3 -factor. The solutions are smooth and preserve small amounts of SUSY. These new backgrounds are found by application of non-Abelian T-duality (sometimes combined with T-duality) on the supergravity solution dual to the Klebanov-Witten CFT compactified to two dimensions. The field theory aspects encoded by these backgrounds are studied. We give a detailed account of conserved charges, central charges, entanglement entropy and Wilson loops. Further, we present a possible field theory interpretation for our backgrounds.Bea, YagoWed, 13 May 2015 21:57:35 GMThttps://repo.scoap3.org/record/10292urn:ISSN:1029-8479Springer/SISSA2015-05-12The classical Yang–Baxter equation and the associated Yangian symmetry of gauged WZW-type theories
https://repo.scoap3.org/record/4275
We construct the Lax-pair, the classical monodromy matrix and the corresponding solution of the Yang–Baxter equation, for a two-parameter deformation of the Principal chiral model for a simple group. This deformation includes as a one-parameter subset, a class of integrable gauged WZW-type theories interpolating between the WZW model and the non-Abelian T-dual of the principal chiral model. We derive in full detail the Yangian algebra using two independent methods: by computing the algebra of the non-local charges and alternatively through an expansion of the Maillet brackets for the monodromy matrix. As a byproduct, we also provide a detailed general proof of the Serre relations for the Yangian symmetry.Itsios, GeorgiosTue, 07 Oct 2014 16:36:27 GMThttps://repo.scoap3.org/record/4275urn:ISSN:0550-3213Elsevier2014-12The all-loop non-Abelian Thirring model and its RG flow
https://repo.scoap3.org/record/2310
We analyze the renormalization group flow in a recently constructed class of integrable σ -models which interpolate between WZW current algebra models and the non-Abelian T-duals of PCM for a simple group G . They are characterized by the integer level k of the current algebra, a deformation parameter λ and they exhibit a remarkable invariance involving the inversion of λ . We compute the β -function for λ to leading order in 1k . Based on agreement with previous results for the exact β -function of the non-Abelian bosonized Thirring model and matching global symmetries, we state that our integrable models are the resummed version (capturing all counterterms in perturbation theory) of the non-Abelian bosonized Thirring model for a simple group G . Finally, we present an analogous treatment in a simple example of a closely related class of models interpolating between gauged WZW coset CFTs and the non-Abelian T-duals of PCM for the coset G/H .Itsios, GeorgiosMon, 05 May 2014 16:44:15 GMThttps://repo.scoap3.org/record/2310urn:ISSN:0370-2693Elsevier2016-05-06