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Title:

Quasinormal modes of massive charged flavor branes

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We present an analysis and classiffication of vector and scalar fluctuations in a D3/D7-brane setup at finite temperature and baryon density. The system is dual to an $$ \mathcal{N} = 2 $$ supersymmetric Yang-Mills theory with SU(Nc) gauge group and Nf hyper-multiplets in the fundamental representation in the quenched approximation. We improve s...

We present an analysis and classiffication of vector and scalar fluctuations in a D3/D7-brane setup at finite temperature and baryon density. The system is dual to an $$ \mathcal{N} = 2 $$ supersymmetric Yang-Mills theory with SU(Nc) gauge group and Nf hyper-multiplets in the fundamental representation in the quenched approximation. We improve significantly over previous results on the quasinormal mode spectrum of D7-branes and stress their novel physical interpretation. Amongst our findings is a new purely imaginary scalar mode that becomes tachyonic at sufficiently low temperature and baryon density. We establish the existence of a critical density above which the scalar mode stays in the stable regime for all temperatures. In the vector sector we study the crossover from the hydrodynamic to the quasiparticle regime and find that it moves to shorter wavelengths for lower temperatures. At zero baryon density the quasinormal modes move toward distinct discrete attractor frequencies that depend on the momentum as we increase the temperature. At finite baryon density, however, the trajectories show a turning behavior such that for low temperature the quasinormal mode spectrum approaches the spectrum of the supersymmetric zero temperature normal modes. We interpret this as resolution of the singular quasinormal mode spectrum that appears at the limiting D7-brane embedding at vanishing baryon density. Minimize

Publisher:

Springer-Verlag

Year of Publication:

2010-03-01

Source:

Journal of High Energy Physics, 2010-03-01, Volume 2010, pp 1-56

Journal of High Energy Physics, 2010-03-01, Volume 2010, pp 1-56 Minimize

Language:

En

Subjects:

Gauge-gravity correspondence ; Black Holes in String Theory ; D-branes ; AdSCFT Correspondence

Gauge-gravity correspondence ; Black Holes in String Theory ; D-branes ; AdSCFT Correspondence Minimize

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Title:

Thermodynamics of the N = 2* strongly coupled plasma,” arXiv:hep-th/0701142

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Gauge/string duality is a potentially important framework for addressing the properties of the strongly coupled quark gluon plasma produced at RHIC. However, constructing an actual string theory dual to QCD has so far proven elusive. In this paper, we take a partial step towards exploring the QCD plasma by investigating the thermodynamics of a n...

Gauge/string duality is a potentially important framework for addressing the properties of the strongly coupled quark gluon plasma produced at RHIC. However, constructing an actual string theory dual to QCD has so far proven elusive. In this paper, we take a partial step towards exploring the QCD plasma by investigating the thermodynamics of a non-conformal system, namely the N = 2 ∗ theory, which is obtained as a mass deformation of the conformal N = 4 gauge theory. We find that at temperatures of order the mass scale, the thermodynamics of the mass deformed plasma is surprisingly close to that of the conformal gauge theory plasma. This suggests that many properties of the quark gluon plasma at RHIC may in fact be well described by even relatively simple models such as that of the conformal N = 4 plasma. The purpose of this paper is to explore properties of strongly coupled nonconformal gauge theory plasma within the framework of the gauge theory/string theory correspondence of Maldacena [1,2]. We are primarily motivated by recent attempts (see [3] and Minimize

Contributors:

The Pennsylvania State University CiteSeerX Archives

Year of Publication:

2013-01-31

Source:

http://arxiv.org/pdf/hep-th/0701142v1.pdf

http://arxiv.org/pdf/hep-th/0701142v1.pdf Minimize

Document Type:

text

Language:

en

DDC:

539 Modern physics *(computed)*

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Metadata may be used without restrictions as long as the oai identifier remains attached to it.

Metadata may be used without restrictions as long as the oai identifier remains attached to it. Minimize

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Title:

UWO-TH-07/10 WIS/07/07-JUNE-DPP

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The black hole in the throat – thermodynamics of strongly coupled cascading gauge theories

The black hole in the throat – thermodynamics of strongly coupled cascading gauge theories Minimize

Contributors:

The Pennsylvania State University CiteSeerX Archives

Year of Publication:

2012-12-04

Source:

http://arxiv.org/pdf/0706.1768v1.pdf

http://arxiv.org/pdf/0706.1768v1.pdf Minimize

Document Type:

text

Language:

en

Rights:

Metadata may be used without restrictions as long as the oai identifier remains attached to it.

Metadata may be used without restrictions as long as the oai identifier remains attached to it. Minimize

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Title:

IFT-UAM/CSIC-09-12 Flavor Superconductivity from Gauge/Gravity Duality

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Abstract: We give a detailed account and extensions of a holographic flavor superconductivity model which we have proposed recently. The model has an explicit field theory realization as strongly coupled N = 2 Super Yang-Mills theory with fundamental matter at finite temperature and finite isospin chemical potential. Using gauge/gravity duality,...

Abstract: We give a detailed account and extensions of a holographic flavor superconductivity model which we have proposed recently. The model has an explicit field theory realization as strongly coupled N = 2 Super Yang-Mills theory with fundamental matter at finite temperature and finite isospin chemical potential. Using gauge/gravity duality, i. e. a probe of two flavor D7–branes in the AdS black hole background, we show that the system undergoes a second order phase transition with critical exponent 1/2. The new ground state may be interpreted as a ρ meson superfluid. It shows signatures known from superconductivity, such as an infinite dc conductivity and a gap in the frequency-dependent conductivity. We present a stringy picture of the condensation mechanism in terms of a recombination of strings. We give a detailed account of the evaluation of the non-Abelian Dirac-Born-Infeld action involved using two different methods. Finally we also consider the case of massive flavors and discuss the holographic Meissner–Ochsenfeld effect in our Minimize

Contributors:

The Pennsylvania State University CiteSeerX Archives

Year of Publication:

2012-11-21

Source:

http://arxiv.org/pdf/0903.1864v2.pdf

http://arxiv.org/pdf/0903.1864v2.pdf Minimize

Document Type:

text

Language:

en

Subjects:

Gauge-gravity correspondence ; D-branes ; Black Holes. Contents

Gauge-gravity correspondence ; D-branes ; Black Holes. Contents Minimize

DDC:

539 Modern physics *(computed)*

Rights:

Metadata may be used without restrictions as long as the oai identifier remains attached to it.

Metadata may be used without restrictions as long as the oai identifier remains attached to it. Minimize

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Title:

Gauge/gravity duality: a road towards reality

Publisher:

Ludwig-Maximilians-Universität München

Year of Publication:

2012-02-23

Document Type:

Dissertation ; NonPeerReviewed

Subjects:

Fakultät für Physik

Fakultät für Physik Minimize

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http://edoc.ub.uni-muenchen.de/14302/

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Title:

The black hole in the throat - thermodynamics of strongly coupled cascading gauge theories

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We numerically construct black hole solutions corresponding to the deconfined, chirally symmetric phase of strongly coupled cascading gauge theories at various temperatures. We compute the free energy as a function of the temperature, and we show that it becomes positive below some critical temperature, indicating the possibility of a first orde...

We numerically construct black hole solutions corresponding to the deconfined, chirally symmetric phase of strongly coupled cascading gauge theories at various temperatures. We compute the free energy as a function of the temperature, and we show that it becomes positive below some critical temperature, indicating the possibility of a first order phase transition at which the theory deconfines and restores the chiral symmetry. ; Comment: 45 pages, 13 figures, latex. v2: typo fixed Minimize

Year of Publication:

2007-06-12

Document Type:

text

Subjects:

High Energy Physics - Theory

High Energy Physics - Theory Minimize

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Title:

Towards a Holographic Realization of Homes' Law

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Gauge/gravity duality has proved to be a very successful tool for describing strongly coupled systems in particle physics and heavy ion physics. The application of the gauge/gravity duality to quantum matter is a promising candidate to explain questions concerning non-zero temperature dynamics and transport coefficients. To a large extent, the s...

Gauge/gravity duality has proved to be a very successful tool for describing strongly coupled systems in particle physics and heavy ion physics. The application of the gauge/gravity duality to quantum matter is a promising candidate to explain questions concerning non-zero temperature dynamics and transport coefficients. To a large extent, the success of applications of gauge/gravity duality to the quark-gluon plasma is founded on the derivation of a universal result, the famous ratio of shear viscosity and entropy density. As a base for applications to condensed matter physics, it is highly desirable to have a similar universal relation in this context as well. A candidate for such a universal law is given by Homes' law: High Tc superconductors, as well as some conventional superconductors, exhibit a universal scaling relation between the superfluid density at zero temperature and the conductivity at the critical temperature times the critical temperature itself. In this work we describe progress in employing the models of holographic superconductors to realize Homes' law and to find a universal relation governing strongly correlated quantum matter. We calculate diffusive processes, including the backreaction of the gravitational matter fields on the geometry. We consider both holographic s-wave and p-wave superconductors. We show that a particular form of Homes' law holds in the absence of backreaction. Moreover, we suggest further steps to be taken for holographically realizing Homes' law more generally in the presence of backreaction. ; Comment: 32 pages, 9 figures and 1 table Minimize

Year of Publication:

2012-06-22

Document Type:

text

Subjects:

High Energy Physics - Theory ; Condensed Matter - Superconductivity

High Energy Physics - Theory ; Condensed Matter - Superconductivity Minimize

DDC:

539 Modern physics *(computed)*

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Title:

Transport in Anisotropic Superfluids: A Holographic Description

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We study transport phenomena in p-wave superfluids in the context of gauge/gravity duality. Due to the spacetime anisotropy of this system, the tensorial structure of the transport coefficients is non-trivial in contrast to the isotropic case. In particular, there is an additional shear mode which leads to a non-universal value of the shear visc...

We study transport phenomena in p-wave superfluids in the context of gauge/gravity duality. Due to the spacetime anisotropy of this system, the tensorial structure of the transport coefficients is non-trivial in contrast to the isotropic case. In particular, there is an additional shear mode which leads to a non-universal value of the shear viscosity even in an Einstein gravity setup. In this paper, we present a complete study of the helicity two and helicity one fluctuation modes. In addition to the non-universal shear viscosity, we also investigate the thermoelectric effect, i.e. the mixing of electric and heat current. Moreover, we also find an additional effect due to the anisotropy, the so-called flexoelectric effect. ; Comment: 38 pages, 11 figures; v2: typos corrected. arXiv admin note: substantial text overlap with arXiv:1011.5912 Minimize

Year of Publication:

2011-09-30

Document Type:

text

Subjects:

High Energy Physics - Theory ; High Energy Physics - Phenomenology ; Physics - Fluid Dynamics

High Energy Physics - Theory ; High Energy Physics - Phenomenology ; Physics - Fluid Dynamics Minimize

DDC:

532 Fluid mechanics; liquid mechanics *(computed)*

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Title:

Non-universal shear viscosity from Einstein gravity

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A very famous result of gauge/gravity duality is the universality of the ratio of shear viscosity to entropy density in every field theory holographically dual to classical, two-derivative (Einstein) gravity. We present a way to obtain deviation form this universality by breaking the rotational symmetry spontaneously. In anisotropic fluids addit...

A very famous result of gauge/gravity duality is the universality of the ratio of shear viscosity to entropy density in every field theory holographically dual to classical, two-derivative (Einstein) gravity. We present a way to obtain deviation form this universality by breaking the rotational symmetry spontaneously. In anisotropic fluids additional shear modes exist and their corresponding shear viscosities may be non-universal. We confirm this by explicitly calculating the shear viscosities in a transversely isotropic background, a p-wave superfluid, and study its critical behavior. This is a first decisive step towards further applications of gauge/gravity duality to physical systems. ; Comment: 11 pages, 2 figures. v2: small corrections Minimize

Year of Publication:

2010-11-26

Document Type:

text

Subjects:

High Energy Physics - Theory ; High Energy Physics - Phenomenology ; Physics - Fluid Dynamics

High Energy Physics - Theory ; High Energy Physics - Phenomenology ; Physics - Fluid Dynamics Minimize

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Title:

Holographic Superfluidity in Imbalanced Mixtures

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We construct superfluid black hole solutions with two chemical potentials. By analogy with QCD, the two chemical potentials correspond to the baryon and isospin symmetries, respectively. We consider two systems: the back-reacted U(2) Einstein-Yang-Mills theory in 4+1 dimensions and the 9+1-dimensional D3/D7 brane setup with two coincident D7-bra...

We construct superfluid black hole solutions with two chemical potentials. By analogy with QCD, the two chemical potentials correspond to the baryon and isospin symmetries, respectively. We consider two systems: the back-reacted U(2) Einstein-Yang-Mills theory in 4+1 dimensions and the 9+1-dimensional D3/D7 brane setup with two coincident D7-brane probes. In the D7-brane model, the identification of baryon and isospin chemical potential is explicit since the dual field theory is explicitly known. Studying the phase diagram, we find in both systems a quantum phase transition at a critical ratio of the two chemical potentials. However the quantum phase transition is different in the two systems: In the D3/D7 brane setup we always find a second order phase transition, while in the Einstein-Yang-Mills theory, depending on the strength of the back-reaction, we obtain a continuous or first order transition. We expect the continuous quantum phase transition to be BKT-like. We comment on the origin of this differing behavior in these apparently very similar models and compare to phenomenological systems. ; Comment: 33 pages, 10 pdf files in 6 figures, v2: Discussion of D3/D7 setup at zero temperature revised Minimize

Year of Publication:

2011-03-21

Document Type:

text

Subjects:

High Energy Physics - Theory ; High Energy Physics - Phenomenology

High Energy Physics - Theory ; High Energy Physics - Phenomenology Minimize

DDC:

539 Modern physics *(computed)*

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