Some extensions for the energy conditions inspired by vacuum nonlinear electrodynamics

2020 ◽  
Vol 101 (8) ◽  
Author(s):  
V. A. Sokolov ◽  
B. D. Garmaev ◽  
V. S. Rostovsky
2016 ◽  
Vol 94 (4) ◽  
Author(s):  
V. I. Denisov ◽  
B. N. Shvilkin ◽  
V. A. Sokolov ◽  
M. I. Vasili’ev

2017 ◽  
Vol 72 (6) ◽  
pp. 513-517 ◽  
Author(s):  
M. I. Vasili’ev ◽  
V. I. Denisov ◽  
A. V. Kozar’ ◽  
P. A. Tomasi-Vshivtseva

2019 ◽  
Vol 28 (08) ◽  
pp. 1950098 ◽  
Author(s):  
P. H. R. S. Moraes ◽  
W. de Paula ◽  
R. A. C. Correa

Wormholes (WHs) are a solution for General Relativity field equations which characterize a passage or tunnel that connects two different regions of spacetime and is filled by some sort of exotic matter that does not satisfy the energy conditions. On the other hand, it is known that in extended theories of gravity, the extra degrees of freedom once provided may allow the energy conditions to be obeyed and, consequently, the matter content of the WH to be nonexotic. In this work, we obtain, as a novelty in the literature, solutions for charged WHs in the [Formula: see text]-extended theory of gravity. We show that the presence of charge in these objects may be a possibility to respect some stability conditions for their metric. Also, remarkably, the energy conditions are respected in the present approach. In addition, we argue that our framework can be very useful to study the possibility of evolving [Formula: see text] and [Formula: see text]-dimensional WH spacetime within the context of nonlinear electrodynamics, which open a new window to probe the physical quantities in a WH-type solution.


2017 ◽  
Vol 96 (3) ◽  
Author(s):  
V. I. Denisov ◽  
E. E. Dolgaya ◽  
V. A. Sokolov ◽  
I. P. Denisova

Author(s):  
Sergey Il'ich Kruglov

The logarithmic correction to Bekenshtein-Hawking entropy in the framework of 4D Einstein$-$Gauss$-$Bonnet gravity coupled with nonlinear electrodynamics is obtained. We explore the black hole solution with the spherically symmetric metric. The logarithmic term in the entropy has a structure similar to the entropy correction in the semi-classical Einstein equations which mimics the quantum correction to the area low. The energy emission rate of black holes and energy conditions are studied. Quasinormal modes of black holes are investigated. The gravitational lensing of light around BHs was investigated. We calculated the deflection angle for some model parameters.


2016 ◽  
Vol 25 (06) ◽  
pp. 1650072 ◽  
Author(s):  
Leonardo Balart ◽  
Francisco Peña

We revisit the relationship of inequality between the gravitational field energy and the Komar charge, both quantities evaluated at the event horizon, for static and spherically symmetric regular black hole solutions obtained with nonlinear electrodynamics. We found a way to characterize these regular black hole solutions by the energy conditions that they satisfy. In particular, we show the relation between the direction of the inequality and the energy condition that satisfies the regular black hole solutions.


2017 ◽  
Vol 32 (23n24) ◽  
pp. 1750147 ◽  
Author(s):  
S. I. Kruglov

A new model of nonlinear electrodynamics with two parameters is proposed. We study the phenomenon of vacuum birefringence, the causality and unitarity in this model. There is no singularity of the electric field in the center of pointlike charges and the total electrostatic energy is finite. We obtain corrections to the Coulomb law at [Formula: see text]. The weak, dominant and strong energy conditions are investigated. Magnetized charged black hole is considered and we evaluate the mass, metric function and their asymptotic at [Formula: see text] and [Formula: see text]. The magnetic mass of the black hole is calculated. The thermodynamic properties and thermal stability of regular black holes are discussed. We calculate the Hawking temperature of black holes and show that there are first-order and second-order phase transitions. The parameters of the model when the black hole is stable are found.


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