An exact two-parameter analytic solution for a hairy black brane is derived in AdS-Einstein-scalar gravity, with thermodynamics obeying a generalized first law and Euler relation, and the boundary theory recovering nearly conformal fluid behavior in the IR thermal limit.
A Novel Formula for Bulk Viscosity from the Null Horizon Focusing Equation
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abstract
The null horizon focusing equation is equivalent via the fluid/gravity correspondence to the entropy balance law of the fluid. Using this equation we derive a simple novel formula for the bulk viscosity of the fluid. The formula is expressed in terms of the dependence of scalar fields at the horizon on thermodynamic variables such as the entropy and charge densities. We apply the formula to three classes of gauge theory plasmas: non-conformal branes, perturbations of the N=4 supersymmetric Yang-Mills theory and holographic models of QCD, and discuss its range of applicability.
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hep-th 1years
2026 1verdicts
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Exact Planar Black Hole in AdS-Einstein-Scalar Gravity with IR Emergent Nearly Conformal Fluid
An exact two-parameter analytic solution for a hairy black brane is derived in AdS-Einstein-scalar gravity, with thermodynamics obeying a generalized first law and Euler relation, and the boundary theory recovering nearly conformal fluid behavior in the IR thermal limit.