scholarly journals Upper bound for diameter of cosmological black holes and nonexistence of black strings

2017 ◽  
Vol 58 (10) ◽  
pp. 102501
Author(s):  
Daisuke Ida
Keyword(s):  
Black Holes ◽  
Upper Bound ◽  
Cosmological Black Holes ◽  
Black Strings

scholarly journals Rotating charged black strings and three-dimensional black holes

1996 ◽  
Vol 54 (6) ◽  
pp. 3840-3853 ◽  
Author(s):  
José P. S. Lemos ◽  
Vilson T. Zanchin
Keyword(s):  
Black Holes ◽  
Three Dimensional ◽  
Black Strings

scholarly journals Extremal Cosmological Black Holes in Horndeski Gravity and the Anti-Evaporation Regime

Universe ◽  
2020 ◽  
Vol 6 (11) ◽  
pp. 210
Author(s):  
Ismael Ayuso ◽  
Diego Sáez-Chillón Gómez
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Cosmological Constant ◽  
Linear Order ◽  
Scalar Tensor Theory ◽  
De Sitter ◽  
Tensor Theory ◽  
Effective Cosmological Constant ◽  
Cosmological Black Holes ◽  
Extremal Black Holes

Extremal cosmological black holes are analysed in the framework of the most general second order scalar-tensor theory, the so-called Horndeski gravity. Such extremal black holes are a particular case of Schwarzschild-De Sitter black holes that arises when the black hole horizon and the cosmological one coincide. Such metric is induced by a particular value of the effective cosmological constant and is known as Nariai spacetime. The existence of this type of solutions is studied when considering the Horndeski Lagrangian and its stability is analysed, where the so-called anti-evaporation regime is studied. Contrary to other frameworks, the radius of the horizon remains stable for some cases of the Horndeski Lagrangian when considering perturbations at linear order.

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.

Evaporation of Cosmological Black Holes

COSMO-97 ◽  
1998 ◽  
Author(s):  
RAPHAEL BOUSSO ◽  
STEPHEN W. HAWKING
Keyword(s):  
Black Holes ◽  
Cosmological Black Holes

scholarly journals Cosmological Black Holes

2002 ◽  
Vol 34 (12) ◽  
pp. 2089-2099 ◽  
Author(s):  
Cosimo Stornaiolo
Keyword(s):  
Black Holes ◽  
Cosmological Black Holes
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