scholarly journals The fate of black holes in an accelerating universe

2004 ◽  
Vol 589 (3-4) ◽  
pp. 78-82 ◽  
Author(s):  
Pedro F. González-Dı́az ◽  
Carmen L. Sigüenza
Keyword(s):  
Black Holes ◽  
Accelerating Universe

scholarly journals From Rindler fluid to dark fluid on the holographic cutoff surface

2021 ◽  
Author(s):  
Rong-Gen Cai ◽  
Gansukh Tumurtushaa ◽  
Yun-Long Zhang
Keyword(s):  
Black Holes ◽  
Accelerating Universe ◽  
De Sitter ◽  
Frw Universe ◽  
Flat Spacetime ◽  
Dark Fluid ◽  
Effective Description

As an approximation to the near horizon regime of black holes, the Rindler fluid was proposed on an accelerating cutoff surface in the flat spacetime. The concept of the Rindler fluid was then generalized into a flat bulk with the cutoff surface of the induced de Sitter and FRW universe, such that an effective description of dark fluid in the accelerating universe can be investigated.

scholarly journals Generalized entropies and corresponding holographic dark energy models

2020 ◽  
Vol 80 (8) ◽  
Author(s):  
H. Moradpour ◽  
A. H. Ziaie ◽  
M. Kord Zangeneh
Keyword(s):  
Black Holes ◽  
Dark Energy ◽  
Holographic Dark Energy ◽  
Apparent Horizon ◽  
Tsallis Entropy ◽  
Accelerating Universe ◽  
Frw Universe ◽  
Energy Models ◽  
Generalized Entropies ◽  
The Universe

Abstract Using Tsallis statistics and its relation with Boltzmann entropy, the Tsallis entropy content of black holes is achieved, a result in full agreement with a recent study (Mejrhit and Ennadifi in Phys Lett B 794:24, 2019). In addition, employing Kaniadakis statistics and its relation with that of Tsallis, the Kaniadakis entropy of black holes is obtained. The Sharma-Mittal and Rényi entropy contents of black holes are also addressed by employing their relations with Tsallis entropy. Thereinafter, relying on the holographic dark energy hypothesis and the obtained entropies, two new holographic dark energy models are introduced and their implications on the dynamics of a flat FRW universe are studied when there is also a pressureless fluid in background. In our setup, the apparent horizon is considered as the IR cutoff, and there is not any mutual interaction between the cosmic fluids. The results indicate that the obtained cosmological models have (i) notable powers to describe the cosmic evolution from the matter-dominated era to the current accelerating universe, and (ii) suitable predictions for the universe age.

Conformally Schwarzschild black holes in an accelerating universe

2014 ◽  
Vol 23 (05) ◽  
pp. 1450048 ◽  
Author(s):  
N. Riazi ◽  
H. Moradpour ◽  
A. Sheykhi
Keyword(s):  
Black Holes ◽  
Physical Properties ◽  
Einstein Gravity ◽  
Time Dependent ◽  
Accelerating Universe ◽  
Spherically Symmetric ◽  
Cosmological Horizon ◽  
Horizon Radius ◽  
Cosmic Expansion ◽  
Spherically Symmetric Solutions

We investigate the physical properties of conformally Schwarzschild black holes (BHs) in a background of accelerating universe. We discuss the effect of the cosmic expansion on the principal quantities of the BH such as mass, temperature, entropy and horizon radius. In particular, we investigate the quasi-static thermodynamics of the BH by considering the fact that the cosmic expansion is very slow on local time scales. We show that, by imposing a condition on Ricci scalar, one can describe time-dependent, spherically symmetric solutions of Einstein gravity in an accelerating universe background in a unified way. A generalization of cosmological horizon, its temperature and other properties of conformally Schwarzschild BHs in a background of accelerating universe is addressed.

Black holes have ring of truth

Nature ◽  
2002 ◽  
Author(s):  
Philip Ball
Keyword(s):  
Black Holes
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