scholarly journals Method to compute the stress-energy tensor for a quantized scalar field when a black hole forms from the collapse of a null shell

2020 ◽  
Vol 102 (12) ◽  
Author(s):  
Paul R. Anderson ◽  
Shohreh Gholizadeh Siahmazgi ◽  
Raymond D. Clark ◽  
Alessandro Fabbri
Keyword(s):  
Black Hole ◽  
Scalar Field ◽  
Energy Tensor ◽  
Stress Energy Tensor ◽  
Stress Energy

scholarly journals Stability of the Regular Hayward Thin-Shell Wormholes

2016 ◽  
Vol 2016 ◽  
pp. 1-13 ◽  
Author(s):  
M. Sharif ◽  
Saadia Mumtaz
Keyword(s):  
Black Hole ◽  
Thin Shell ◽  
Energy Conditions ◽  
Stability Conditions ◽  
Energy Tensor ◽  
Stress Energy Tensor ◽  
Cosmic Expansion ◽  
Stress Energy ◽  
Thin Shell Wormholes ◽  
The Stability

The aim of this paper is to construct regular Hayward thin-shell wormholes and analyze their stability. We adopt Israel formalism to calculate surface stresses of the shell and check the null and weak energy conditions for the constructed wormholes. It is found that the stress-energy tensor components violate the null and weak energy conditions leading to the presence of exotic matter at the throat. We analyze the attractive and repulsive characteristics of wormholes corresponding toar>0andar<0, respectively. We also explore stability conditions for the existence of traversable thin-shell wormholes with arbitrarily small amount of fluid describing cosmic expansion. We find that the space-time has nonphysical regions which give rise to event horizon for0<a0<2.8and the wormhole becomes nontraversable producing a black hole. The nonphysical region in the wormhole configuration decreases gradually and vanishes for the Hayward parameterl=0.9. It is concluded that the Hayward and Van der Waals quintessence parameters increase the stability of thin-shell wormholes.

scholarly journals Matter Accretion Versus Semiclassical Bounce in Schwarzschild Interior

Universe ◽  
2020 ◽  
Vol 6 (10) ◽  
pp. 178
Author(s):  
Kirill Bronnikov ◽  
Sergey Bolokhov ◽  
Milena Skvortsova
Keyword(s):  
Black Hole ◽  
Vacuum Polarization ◽  
Particle Production ◽  
Energy Tensor ◽  
Stress Energy Tensor ◽  
Schwarzschild Black Hole ◽  
White Hole ◽  
Stress Energy ◽  
Black Hole Interior ◽  
Nontrivial Topology

We discuss the properties of the previously constructed model of a Schwarzschild black hole interior where the singularity is replaced by a regular bounce, ultimately leading to a white hole. We assume that the black hole is young enough so that the Hawking radiation may be neglected. The model is semiclassical in nature and uses as a source of gravity the effective stress-energy tensor (SET) corresponding to vacuum polarization of quantum fields, and the minimum spherical radius is a few orders of magnitude larger than the Planck length, so that the effects of quantum gravity should still be negligible. We estimate the other quantum contributions to the effective SET, caused by a nontrivial topology of spatial sections and particle production from vacuum due to a nonstationary gravitational field and show that these contributions are negligibly small as compared to the SET due to vacuum polarization. The same is shown for such classical phenomena as accretion of different kinds of matter to the black hole and its further motion to the would-be singularity. Thus, in a clear sense, our model of a semiclassical bounce instead of a Schwarzschild singularity is stable under both quantum and classical perturbations.

scholarly journals Renormalized Stress-Energy Tensor of an Evaporating Spinning Black Hole

2017 ◽  
Vol 118 (14) ◽  
Author(s):  
Adam Levi ◽  
Ehud Eilon ◽  
Amos Ori ◽  
Maarten van de Meent
Keyword(s):  
Black Hole ◽  
Energy Tensor ◽  
Stress Energy Tensor ◽  
Stress Energy

scholarly journals Quantum gravitational corrections to the stress-energy tensor around the rotating BTZ black hole

2008 ◽  
Vol 2008 (09) ◽  
pp. 095-095 ◽  
Author(s):  
Dawood A Kothawala ◽  
S Shankaranarayanan ◽  
L Sriramkumar
Keyword(s):  
Black Hole ◽  
Energy Tensor ◽  
Stress Energy Tensor ◽  
Btz Black Hole ◽  
Stress Energy
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