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139
Breaking an Abelian gauge symmetry near a black hole horizon
, 2008
"... I argue that coupling the Abelian Higgs model to gravity plus a negative cosmological constant leads to black holes which spontaneously break the gauge invariance via a charged scalar condensate slightly outside their horizon. This suggests that black holes can superconduct. ..."
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Cited by 274 (8 self)
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I argue that coupling the Abelian Higgs model to gravity plus a negative cosmological constant leads to black holes which spontaneously break the gauge invariance via a charged scalar condensate slightly outside their horizon. This suggests that black holes can superconduct.
Towards strange metallic holography
"... We initiate a holographic model building approach to ‘strange metallic ’ phenomenology. Our model couples a neutral Lifshitz-invariant quantum critical theory, dual to a bulk gravitational background, to a finite density of gapped probe charge carriers, dually described by D-branes. In the physical ..."
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Cited by 117 (18 self)
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We initiate a holographic model building approach to ‘strange metallic ’ phenomenology. Our model couples a neutral Lifshitz-invariant quantum critical theory, dual to a bulk gravitational background, to a finite density of gapped probe charge carriers, dually described by D-branes. 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 non-Fermi 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 charge-charge interactions when z ≥ 2. We outline a program to extend this model building approach to other anomalous observables of
Dielectric branes
- JHEP
, 1999
"... Preprint typeset in JHEP style- PAPER VERSION ..."
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Holographic Thermodynamics at Finite Baryon Density: Some Exact Results
, 2007
"... We use the AdS/CFT correspondence to study the thermodynamics of massive N = 2 supersymmetric hypermultiplets coupled to N = 4 supersymmetric SU(Nc) Yang-Mills theory in the limits of large Nc and large ’t Hooft coupling. In particular, we study the theory at finite baryon number density. At zero te ..."
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Cited by 52 (9 self)
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We use the AdS/CFT correspondence to study the thermodynamics of massive N = 2 supersymmetric hypermultiplets coupled to N = 4 supersymmetric SU(Nc) Yang-Mills theory in the limits of large Nc and large ’t Hooft coupling. In particular, we study the theory at finite baryon number density. At zero temperature, we present an exact expression for the hypermultiplets’ leading-order contribution to the free energy, and in the supergravity description we clarify which D-brane configuration is appropriate for any given value of the chemical potential. We find a second-order phase transition when the chemical potential equals the mass. At finite temperature, we present an exact expression for the hypermultiplets’ leading-order contribution to the free energy at zero mass.
Flavor Superconductivity from Gauge/Gravity Duality
, 2009
"... 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 ..."
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Cited by 47 (12 self)
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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
A Holographic Quantum Critical Point at Finite Magnetic Field and Finite Density
- JHEP
, 2010
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