2011/03/08 by Christopher Eling, Yaron Oz · 3 citations
Physics and Astronomy · #Apparent horizon #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Entropy (arrow of time) #Gauge theory #High-Energy Particle Collisions Research #Horizon #Null (SQL) #Scalar (mathematics) #Second law of thermodynamics #Volume viscosity #gr-qc #hep-th
paper · pdf · doi:10.1007/jhep06(2011)007
published as JHEP 1106:007,2011 · 23 pages, 1 appendix
arxiv created 2011/03/08 · openalex publication_date 2011/06/01 · arxiv updated 2011/06/09 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
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.