scholarly journals UNIFIED APPROACH TO STUDY QUANTUM PROPERTIES OF PRIMORDIAL BLACK HOLES, WORMHOLES AND OF QUANTUM COSMOLOGY

1999 ◽  
Vol 14 (20) ◽  
pp. 1309-1316 ◽  
Author(s):  
S. NOJIRI ◽  
O. OBREGON ◽  
S. D. ODINTSOV
Keyword(s):  
Black Holes ◽  
Quantum Cosmology ◽  
Quantum Corrections ◽  
Primordial Black Holes ◽  
Unified Approach ◽  
S Wave ◽  
Singularity Problem ◽  
Wave Approximation ◽  
Quantum Properties ◽  
Large N

We review the anomaly induced effective action for dilaton coupled spinors and scalars in large-N and s-wave approximation. It may be applied to study the following fundamental problems: construction of quantum corrected black holes (BHs), inducing of primordial wormholes in the early Universe (this effect is confirmed) and the solution of initial singularity problem. The recently discovered anti-evaporation of multiple horizon BHs is discussed. The existence of such primordial BHs may be interpreted as SUSY manifestation. Quantum corrections to BHs thermodynamics may also be discussed within such scheme.

scholarly journals THERMODYNAMICS OF SCHWARZSCHILD–(ANTI-)DE SITTER BLACK HOLES WITH ACCOUNT OF QUANTUM CORRECTIONS

2000 ◽  
Vol 15 (07) ◽  
pp. 989-1010 ◽  
Author(s):  
SHIN'ICHI NOJIRI ◽  
SERGEI D. ODINTSOV
Keyword(s):  
Black Holes ◽  
Effective Action ◽  
Quantum Correction ◽  
Quantum Corrections ◽  
De Sitter ◽  
S Wave ◽  
Wave Approximation ◽  
Quantum Matter ◽  
Large N ◽  
Gravitational Background

We discuss the quantum corrections to thermodynamics (and geometry) of S(A)dS BH's using large N one-loop anomaly induced effective action for dilaton coupled matter (scalars and spinors). It is found that the temperature, mass and entropy with account of quantum effects for multiply horizon SdS BH and SAdS BH which also gives the corresponding expressions for their limits: Schwarzschild and de Sitter spaces. In the last case one can talk about quantum correction to the entropy of an expanding universe. The anomaly induced action under discussion corresponds to 4d formulation (s-wave approximation, 4d quantum matter is a minimal one) as well as 2d formulation (complete effective action, 2d quantum matter is a dilaton coupled one). Hence, most of the results are given for the same gravitational background with interpretation as 4d quantum corrected BH or 2d quantum corrected dilatonic BH. Quantum aspects of thermodynamics of 4d 't Hooft BH model are also considered.

scholarly journals Evolution of Primordial Black Holes in Loop Quantum Cosmology

2014 ◽  
Vol 35 (1) ◽  
pp. 97-106 ◽  
Author(s):  
D. Dwivedee ◽  
B. Nayak ◽  
M. Jamil ◽  
L. P. Singh ◽  
R. Myrzakulov
Keyword(s):  
Black Holes ◽  
Quantum Cosmology ◽  
Loop Quantum Cosmology ◽  
Primordial Black Holes

GRAVITATIONAL INSTANTONS: RECENT DEVELOPMENTS

2002 ◽  
Vol 17 (15n17) ◽  
pp. 1123-1133 ◽  
Author(s):  
S. MUKHERJEE ◽  
B. C. PAUL
Keyword(s):  
Black Holes ◽  
Quantum Cosmology ◽  
Quadratic Term ◽  
Inflationary Universe ◽  
Primordial Black Holes ◽  
Gravitational Instantons ◽  
Higher Derivative ◽  
Recent Developments ◽  
Universe Problem ◽  
Hilbert Action

Recent developments in the semiclassical quantum cosmology have been reviewed. Two processes have been considered in detail: (i) creation of an inflationary universe with a pair of Primordial Black Holes and (ii) the quantum creation of an open inflationary universe. While the first makes use of standard non-singular instanton, the second process has been described by a singular Hawking-Turok (HT) instanton. To examine the efficacy of the techniques and also to check the robustness of the results, the processes have been studied in higher derivative theories, including αR2 and βR3 terms to the Hilbert action. It has been shown that with α > 0, the quadratic term suppresses the production of primordial black holes. For the open universe problem in the higher derivative theory, the parameters needed for the occurrence of the HT instanton are found to be highly constrained. Moreover, the legitimacy of HT instantons remains to be established, although considerable activities in this field have been reported.

scholarly journals CAN QUANTUM-CORRECTED BTZ BLACK HOLE ANTI-EVAPORATE?

1998 ◽  
Vol 13 (33) ◽  
pp. 2695-2704 ◽  
Author(s):  
SHIN'ICHI NOJIRI ◽  
SERGEI D. ODINTSOV
Keyword(s):  
Black Hole ◽  
Effective Action ◽  
Quantum Evolution ◽  
S Wave ◽  
Btz Black Hole ◽  
Higher Modes ◽  
Wave Approximation ◽  
Large N ◽  
The One ◽  
Kaluza Klein

Kaluza–Klein reduction of 3-D gravity with minimal scalars leads to 2-D dilaton-Maxwell gravity with dilaton coupled scalars. Evaluating the one-loop effective action for dilaton coupled scalars in large-N and s-wave approximation, we apply it to study quantum evolution of BTZ black hole. It is shown that quantum-corrected BTZ BH may evaporate or else anti-evaporate which is similar to 4-D Nariai BH as is observed by Bousso and Hawking. Instable higher modes in the spectrum also indicate the possibility of proliferation of BTZ BH.

Cosmology, primordial black holes, and supermassive particles

1985 ◽  
Vol 145 (3) ◽  
pp. 369 ◽  
Author(s):  
A.G. Polnarev ◽  
M.Yu. Khlopov
Keyword(s):  
Black Holes ◽  
Primordial Black Holes

scholarly journals Bootstrapped Newtonian Cosmology and the Cosmological Constant Problem

Symmetry ◽  
2021 ◽  
Vol 13 (2) ◽  
pp. 358
Author(s):  
Roberto Casadio ◽  
Andrea Giusti
Keyword(s):  
Black Holes ◽  
Cosmological Constant ◽  
Quantum Cosmology ◽  
Quantum Physics ◽  
Gravitational Interaction ◽  
Newtonian Gravity ◽  
Cosmological Constant Problem ◽  
Newtonian Cosmology ◽  
Natural Solution ◽  
The Impact

Bootstrapped Newtonian gravity was developed with the purpose of estimating the impact of quantum physics in the nonlinear regime of the gravitational interaction, akin to corpuscular models of black holes and inflation. In this work, we set the ground for extending the bootstrapped Newtonian picture to cosmological spaces. We further discuss how such models of quantum cosmology can lead to a natural solution to the cosmological constant problem.

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