期刊
PHYSICAL REVIEW LETTERS
卷 101, 期 13, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.101.131601
关键词
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资金
- Department of Energy [DE-FG02-91ER40671]
- NSF [PHY-0652782]
- Office of Naval Research
- FCT [SFRH/BD/30374/2006]
We consider classes of translationally invariant black hole solutions whose equations of state closely resemble that of QCD at zero chemical potential. We use these backgrounds to compute the ratio zeta / s of bulk viscosity to entropy density. For a class of black holes that exhibits a first-order transition, we observe a sharp rise in zeta / s near T-c. For constructions that exhibit a smooth crossover, like QCD does, the rise in zeta / s is more modest. We conjecture that divergences in zeta / s for black hole horizons are related to extrema of the entropy density as a function of temperature.
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