scholarly journals Proposed lower bound for the shear viscosity to entropy density ratio in some dense liquids

2009 ◽  
Vol 373 (10) ◽  
pp. 992-998 ◽  
Author(s):  
G.G.N. Angilella ◽  
N.H. March ◽  
F.M.D. Pellegrino ◽  
R. Pucci
Keyword(s):  
Lower Bound ◽  
Shear Viscosity ◽  
Density Ratio ◽  
Entropy Density

scholarly journals Shear viscosity to entropy density ratio of Hagedorn states

2020 ◽  
Vol 102 (3) ◽  
Author(s):  
Jan Rais ◽  
Kai Gallmeister ◽  
Carsten Greiner
Keyword(s):  
Shear Viscosity ◽  
Density Ratio ◽  
Entropy Density

scholarly journals Causality of black holes in 4-dimensional Einstein–Gauss–Bonnet–Maxwell theory

2020 ◽  
Vol 80 (8) ◽  
Author(s):  
Xian-Hui Ge ◽  
Sang-Jin Sin
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Shear Viscosity ◽  
Upper Bound ◽  
Causal Structure ◽  
Density Ratio ◽  
Entropy Density ◽  
Coupling Constant ◽  
Maxwell Theory ◽  
Black Hole Solutions

Abstract We study charged black hole solutions in 4-dimensional (4D) Einstein–Gauss–Bonnet–Maxwell theory to the linearized perturbation level. We first compute the shear viscosity to entropy density ratio. We then demonstrate how bulk causal structure analysis imposes an upper bound on the Gauss–Bonnet coupling constant in the AdS space. Causality constrains the value of Gauss–Bonnet coupling constant $$\alpha _{GB}$$αGB to be bounded by $$\alpha _{GB}\le 0$$αGB≤0 as $$D\rightarrow 4$$D→4.

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