Viscosity in Strongly Interacting Quantum Field Theories from Black Hole Physics
Abstract
The ratio of shear viscosity to volume density of entropy can be used to characterize how close a given fluid is to being perfect. Using string theory methods, we show that this ratio is equal to a universal value of ℏ/4πk_{B} for a large class of strongly interacting quantum field theories whose dual description involves black holes in anti de Sitter space. We provide evidence that this value may serve as a lower bound for a wide class of systems, thus suggesting that black hole horizons are dual to the most ideal fluids.
 Publication:

Physical Review Letters
 Pub Date:
 March 2005
 DOI:
 10.1103/PhysRevLett.94.111601
 arXiv:
 arXiv:hepth/0405231
 Bibcode:
 2005PhRvL..94k1601K
 Keywords:

 11.10.Wx;
 04.70.Dy;
 11.25.Tq;
 47.75.+f;
 Finitetemperature field theory;
 Quantum aspects of black holes evaporation thermodynamics;
 Gauge/string duality;
 Relativistic fluid dynamics;
 High Energy Physics  Theory;
 General Relativity and Quantum Cosmology;
 High Energy Physics  Phenomenology
 EPrint:
 9 pages, title changed, appendix moved into the main text