scholarly journals Planar black holes configurations and shear viscosity in arbitrary dimensions with shift and reflection symmetric scalar-tensor theories

2022 ◽  
Vol 105 (2) ◽  
Author(s):  
Moisés Bravo-Gaete ◽  
M. M. Stetsko
2017 ◽  
Vol 942 ◽  
pp. 012018
Author(s):  
Matteo Tuveri ◽  
Mariano Cadoni ◽  
Edgardo Franzin
Keyword(s):  

2020 ◽  
pp. 2050330
Author(s):  
Mehdi Sadeghi

In this paper, the Einstein AdS black brane solution in the presence of a string cloud in the context of d-dimensional massive gravity is introduced. The ratio of shear viscosity to entropy density for this solution violates the KSS bound by applying the Dirichlet boundary and regularity on the horizon conditions. Our result shows that this value is independent of string cloud in any arbitrary dimensions.


2018 ◽  
Vol 97 (2) ◽  
Author(s):  
Cristián Erices ◽  
Cristián Martínez

Author(s):  
Xian-Hui Ge ◽  
Sang-Jin Sin

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.


1994 ◽  
Vol 09 (38) ◽  
pp. 3509-3516 ◽  
Author(s):  
KIYOSHI SHIRAISHI

The quantum contribution of a scalar field to entropy of a dilatonic black hole is calculated in the brick wall model by the WKB method and analyzed by a high-temperature expansion. If the cutoff distance from the horizon approaches zero, the leading divergent piece of entropy turns out to be proportional to the “area” of the horizon surface (which has (N−1)-dimensional extension in (N+1)-dimensional space-time) and independent of other properties of black holes even in the case of general dilaton coupling. There is also qualitative argument with the known result of subleading divergence for N=3.


2018 ◽  
Vol 97 (10) ◽  
Author(s):  
Hovhannes Demirchian ◽  
Armen Nersessian ◽  
Saeedeh Sadeghian ◽  
M. M. Sheikh-Jabbari

2012 ◽  
Vol 29 (10) ◽  
pp. 100401 ◽  
Author(s):  
A. Belhaj ◽  
M. Chabab ◽  
H. El Moumni ◽  
M. B. Sedra

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