Constructs a derivative expansion for linear response that matches multi-pole correlators while preserving hydrostaticity, then applies it to D3/D5 probe brane charge fluctuations to study quasihydrodynamic transport at large density.
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abstract
We use the AdS/CFT correspondence to compute the conductivity of massive N=2 hypermultiplet fields at finite baryon number density in an N=4 SU(N_c) super-Yang-Mills theory plasma in the large N_c, large 't Hooft coupling limit. The finite baryon density provides charge carriers analogous to electrons in a metal. An external electric field then induces a finite current which we determine directly. Our result for the conductivity is good for all values of the mass, external field and density, modulo statements about the yet-incomplete phase diagram. In the appropriate limits it agrees with known results obtained from analyzing small fluctuations around equilibrium. For large mass, where we expect a good quasi-particle description, we compute the drag force on the charge carriers and find that the answer is unchanged from the zero density case. Our method easily generalizes to a wide class of systems of probe branes in various backgrounds.
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Holographic analysis of Romans supergravity solutions with Abelian magnetic flux yields a family of confining 4D duals featuring a flux-driven first-order deconfinement transition and two parametrically light, nearly degenerate scalar bound states near the transition.
Equips bottom-up holographic D-brane models with dynamical boundary gauge fields and shows that quasinormal mode dispersion relations in equilibrium and nonequilibrium states match hydrodynamics with dynamical U(1) symmetry.
D-instantons induce a gapped topological insulator phase in holographic Weyl semimetals via phase diagrams from D7 brane free energy and non-linear conductivity calculations.
Near the insulating-CME phase boundary in the D3/D7 model, the chiral magnetic current shows multi-valued dependence on magnetic field strength, while axial chemical potential and magnetic field cooperatively stabilize the insulating phase.
citing papers explorer
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Linear response beyond hydrodynamic poles
Constructs a derivative expansion for linear response that matches multi-pole correlators while preserving hydrostaticity, then applies it to D3/D5 probe brane charge fluctuations to study quasihydrodynamic transport at large density.
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Bound states and deconfinement from Romans supergravity with magnetic flux
Holographic analysis of Romans supergravity solutions with Abelian magnetic flux yields a family of confining 4D duals featuring a flux-driven first-order deconfinement transition and two parametrically light, nearly degenerate scalar bound states near the transition.
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Holographic D-brane constructions with dynamical gauge fields
Equips bottom-up holographic D-brane models with dynamical boundary gauge fields and shows that quasinormal mode dispersion relations in equilibrium and nonequilibrium states match hydrodynamics with dynamical U(1) symmetry.
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D-instanton Effects on the Holographic Weyl Semimetals
D-instantons induce a gapped topological insulator phase in holographic Weyl semimetals via phase diagrams from D7 brane free energy and non-linear conductivity calculations.
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Nonlinear response of the chiral magnetic effect in the D3/D7 holographic model
Near the insulating-CME phase boundary in the D3/D7 model, the chiral magnetic current shows multi-valued dependence on magnetic field strength, while axial chemical potential and magnetic field cooperatively stabilize the insulating phase.