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Does a cloud of strings affect shear viscosity bound? (English) Zbl 1478.83174

Summary: The Einstein AdS black brane with a cloud of strings background in context of massive gravity is introduced. There is a momentum dissipation on the boundary because of graviton mass on the bulk. The ratio of shear viscosity to entropy density is calculated for this solution. This value violates the KSS bound if we apply the Dirichlet boundary and regularity on the horizon conditions. Our result shows that this value is independent of the cloud of strings.

MSC:

83C57 Black holes
83E30 String and superstring theories in gravitational theory
83C65 Methods of noncommutative geometry in general relativity
76E20 Stability and instability of geophysical and astrophysical flows
76E05 Parallel shear flows in hydrodynamic stability
35D40 Viscosity solutions to PDEs
58J32 Boundary value problems on manifolds

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