期刊
PHYSICAL REVIEW D
卷 80, 期 2, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.80.025002
关键词
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资金
- U.S. Department of Energy [DE-FG02-95ER40899]
- Science and Technology Facilities Council [ST/F002998/1] Funding Source: researchfish
- STFC [ST/F002998/1] Funding Source: UKRI
We examine the effects of higher derivative corrections on eta/s, the ratio of shear viscosity to entropy density, in the case of a finite R-charge chemical potential. In particular, we work in the framework of five-dimensional N=2 gauged supergravity, and include terms up to four derivatives, representing the supersymmetric completion of the Chern-Simons term A boolean AND Tr(R boolean AND R). The addition of the four-derivative terms yields a correction which is a 1/N effect, and in general gives rise to a violation of the eta/s bound. Furthermore, we find that, once the bound is violated, turning on the chemical potential only leads to an even larger violation of the bound.
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