scholarly journals Impact of the energy-loss spatial profile and shear-viscosity to entropy-density ratio for the Mach cone versus head-shock signals produced by a fast-moving parton in a quark-gluon plasma

2015 ◽  
Vol 92 (2) ◽  
Author(s):  
Alejandro Ayala ◽  
Jorge David Castaño-Yepes ◽  
Isabel Dominguez ◽  
Maria Elena Tejeda-Yeomans
Keyword(s):  
Energy Loss ◽  
Shear Viscosity ◽  
Quark Gluon Plasma ◽  
Fast Moving ◽  
Density Ratio ◽  
Gluon Plasma ◽  
Entropy Density ◽  
Spatial Profile ◽  
Cone Versus

scholarly journals Backreaction effects due to matter coupled higher derivative gravity

2015 ◽  
Vol 30 (16) ◽  
pp. 1550065 ◽  
Author(s):  
Lata Kh Joshi ◽  
P. Ramadevi
Keyword(s):  
Shear Viscosity ◽  
Quark Gluon Plasma ◽  
Transport Coefficients ◽  
Gluon Plasma ◽  
Entropy Density ◽  
Flow Measurements ◽  
Strongly Coupled ◽  
Higher Derivative ◽  
Scalar Matter ◽  
Dimensional Spacetime

AdS-hydrodynamics has proven to be a useful tool for obtaining transport coefficients observed in the collective flow of strongly coupled fluids like quark gluon plasma (QGP). Particularly, the ratio of shear viscosity to entropy density η/s obtained from elliptic flow measurements can be matched with the computation done in the dual gravity theory. The experimentally observed temperature dependence of η/s requires the study of scalar matter coupled AdS gravity including higher derivative curvature corrections. We obtain the backreaction to the metric for such a matter coupled AdS gravity in D-dimensional spacetime due to the higher derivative curvature corrections. Then, we present the backreaction corrections to shear viscosity η and entropy density s.

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.

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
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