Results 1  10
of
345
Holographic duality with a view toward manybody physics
, 2009
"... These are notes based on a series of lectures given at the KITP workshop Quantum Criticality and the AdS/CFT Correspondence in July, 2009. The goal of the lectures was to introduce condensed matter physicists to the AdS/CFT correspondence. Discussion of string theory and of supersymmetry is avoided ..."
Abstract

Cited by 150 (2 self)
 Add to MetaCart
(Show Context)
These are notes based on a series of lectures given at the KITP workshop Quantum Criticality and the AdS/CFT Correspondence in July, 2009. The goal of the lectures was to introduce condensed matter physicists to the AdS/CFT correspondence. Discussion of string theory and of supersymmetry is avoided to the extent possible.
Holographic Entanglement Entropy: An Overview
, 2009
"... In this article, we review recent progresses on the holographic understandings of the entanglement entropy in the AdS/CFT correspondence. After reviewing the general idea of holographic entanglement entropy, we will explain its applications to confinement/deconfinement phase transitions, black hole ..."
Abstract

Cited by 120 (12 self)
 Add to MetaCart
In this article, we review recent progresses on the holographic understandings of the entanglement entropy in the AdS/CFT correspondence. After reviewing the general idea of holographic entanglement entropy, we will explain its applications to confinement/deconfinement phase transitions, black hole entropy and covariant formulation of holography.
Towards strange metallic holography
"... We initiate a holographic model building approach to ‘strange metallic ’ phenomenology. Our model couples a neutral Lifshitzinvariant quantum critical theory, dual to a bulk gravitational background, to a finite density of gapped probe charge carriers, dually described by Dbranes. In the physical ..."
Abstract

Cited by 117 (18 self)
 Add to MetaCart
(Show Context)
We initiate a holographic model building approach to ‘strange metallic ’ phenomenology. Our model couples a neutral Lifshitzinvariant quantum critical theory, dual to a bulk gravitational background, to a finite density of gapped probe charge carriers, dually described by Dbranes. In the physical regime of temperature much lower than the charge density and gap, we exhibit anomalous scalings of the temperature and frequency dependent conductivity. Choosing the dynamical critical exponent z appropriately we can match the nonFermi liquid scalings, such as linear resistivity, observed in strange metal regimes. As part of our investigation we outline three distinct string theory realizations of Lifshitz geometries: from F theory, from polarised branes, and from a gravitating charged Fermi gas. We also identify general features of renormalisation group flow in Lifshitz theories, such as the appearance of relevant chargecharge interactions when z ≥ 2. We outline a program to extend this model building approach to other anomalous observables of
Introduction to Holographic Superconductors
, 2010
"... Abstract These lectures give an introduction to the theory of holographic superconductors. These are superconductors that have a dual gravitational description using gauge/gravity duality. After introducing a suitable gravitational theory, we ..."
Abstract

Cited by 91 (3 self)
 Add to MetaCart
(Show Context)
Abstract These lectures give an introduction to the theory of holographic superconductors. These are superconductors that have a dual gravitational description using gauge/gravity duality. After introducing a suitable gravitational theory, we
Electron stars for holographic metallic criticality
 Phys.Rev. D83 (2011) 046003, arXiv:1008.2828 [hepth
"... We refer to the ground state of a gravitating, charged ideal fluid of fermions held at a finite chemical potential as an ‘electron star’. In a holographic setting, electron stars are candidate gravity duals for strongly interacting finite fermion density systems. We show how electron stars develop a ..."
Abstract

Cited by 56 (7 self)
 Add to MetaCart
(Show Context)
We refer to the ground state of a gravitating, charged ideal fluid of fermions held at a finite chemical potential as an ‘electron star’. In a holographic setting, electron stars are candidate gravity duals for strongly interacting finite fermion density systems. We show how electron stars develop an emergent Lifshitz scaling at low energies. This IR scaling region is a consequence of the two way interaction between emergent quantum critical bosonic modes and the finite density of fermions. By integrating from the IR region to an asymptotically AdS4 spacetime, we compute basic properties of the electron stars, including their electrical conductivity. We emphasize the challenge of connecting UV and IR physics in strongly interacting finite density systems. ar
Wilsonian Approach to Fluid/Gravity Duality
 JHEP 1103 (2011) 141 [arXiv:1006.1902 [hepth
"... ar ..."
(Show Context)
Spectral weight in holographic scaling geometries
, 2012
"... We compute the low energy spectral density of transverse currents in theories with holographic duals that exhibit an emergent scaling symmetry characterized by dynamical critical exponent z and hyperscaling violation exponent θ. For any finite z and θ, the low energy spectral density is exponential ..."
Abstract

Cited by 39 (6 self)
 Add to MetaCart
We compute the low energy spectral density of transverse currents in theories with holographic duals that exhibit an emergent scaling symmetry characterized by dynamical critical exponent z and hyperscaling violation exponent θ. For any finite z and θ, the low energy spectral density is exponentially small at nonzero momentum. This indicates that any nonzero momentum low energy excitations of putative hidden Fermi surfaces are not visible in the classical bulk limit. We furthermore show that if the limit z → ∞ is taken with the ratio η = −θ/z> 0 held fixed, then the resulting theory is locally quantum critical with an entropy density that vanishes at low temperatures as s ∼ T η. In these cases the low energy spectral weight at nonzero momentum is not exponentially suppressed, possibly indicating a more fermionic nature of these theories.
Gauge gravity duality for dwave superconductors . . .
, 2010
"... We write down an action for a charged, massive spin two field in a fixed Einstein background. Despite some technical problems, we argue that in an effective field theory framework and in the context of the AdS/CFT correspondence, this action can be used to study the properties of a superfluid phase ..."
Abstract

Cited by 32 (2 self)
 Add to MetaCart
We write down an action for a charged, massive spin two field in a fixed Einstein background. Despite some technical problems, we argue that in an effective field theory framework and in the context of the AdS/CFT correspondence, this action can be used to study the properties of a superfluid phase transition with a dwave order parameter in a dual strongly interacting field theory. We investigate the phase diagram and the charge conductivity of the superfluid phase. We also explain how possible couplings between the spin two field and bulk fermions affect the fermion spectral function.
A boundary stress tensor for higherderivative gravity
 in AdS and Lifshitz backgrounds, JHEP 1004 (2010) 093, 1001.3598
"... ar ..."
Transport Coefficients at Zero Temperature from Extremal Black Holes
, 910
"... Using the AdS/CFT correspondence we study transport coefficients of a stronglycoupled (2 + 1)dimensional boundary field theory at zero temperature and finite charge density. The boundary field theory under consideration is dual to the extremal ReissnerNordström AdS4 black hole in the bulk. We show ..."
Abstract

Cited by 28 (2 self)
 Add to MetaCart
(Show Context)
Using the AdS/CFT correspondence we study transport coefficients of a stronglycoupled (2 + 1)dimensional boundary field theory at zero temperature and finite charge density. The boundary field theory under consideration is dual to the extremal ReissnerNordström AdS4 black hole in the bulk. We show that, like the cases of scalar and spinor operators studied in [1], the correlators of charge (vector) current and energymomentum (tensor) operators exhibit scaling behavior at low frequency. The existence of such low frequency behavior is related to the fact that the nearhorizon geometry of the extremal black hole background has an AdS2 factor. We carefully calculate the shear viscosity (at zero temperature) and show that the ratio of the shear viscosity to the entropy density takes the value of 1/4π. Because of the AdS2 factor, we argue that this result stays the same for all ddimensional boundary field theories dual to the extremal ReissnerNordström AdSd+1 black holes. Also, we compute the charge conductivity at zero temperature and show that, unlike the finite temperature case, it vanishes. This result, also attributed to the near horizon AdS2 factor, is argued to hold true regardless of the dimension of the zerotemperature boundary field theory. Finally, using the extremal dyonic AdS4 black hole as the background, we extract the conductivity