Viscosity bound violation in higher derivative gravity

被引：488

作者：

Brigante, Mauro ^{[1
]}

Liu, Hong ^{[1
]}

Myers, Robert C. ^{[2
,3
]}

Shenker, Stephen ^{[4
]}

Sho Yaida ^{[4
]}

机构：

[1] MIT, Ctr Theoret Phys, Cambridge, MA 02139 USA

[2] Perimeter Inst Theoret Phys, Waterloo, ON N2L 2Y5, Canada

[3] Univ Waterloo, Dept Phys & Astron, Waterloo, ON N2L 3G1, Canada

[4] Stanford Univ, Dept Phys, Stanford, CA 94305 USA

来源：

PHYSICAL REVIEW D | 2008年 / 77卷 / 12期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1103/PhysRevD.77.126006

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Motivated by the vast string landscape, we consider the shear viscosity to entropy density ratio in conformal field theories dual to Einstein gravity with curvature square corrections. After field redefinitions these theories reduce to Gauss-Bonnet gravity, which has special properties that allow us to compute the shear viscosity nonperturbatively in the Gauss-Bonnet coupling. By tuning of the coupling, the value of the shear viscosity to entropy density ratio can be adjusted to any positive value from infinity down to zero, thus violating the conjectured viscosity bound. At linear order in the coupling, we also check consistency of four different methods to calculate the shear viscosity, and we find that all of them agree. We search for possible pathologies associated with this class of theories violating the viscosity bound.

引用

页数：17

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