scholarly journals Quantum probe of time-like naked singularities for electrically and magnetically charged black holes in a model of nonlinear electrodynamics

2020 ◽  
Vol 35 (29) ◽  
pp. 2050242
Author(s):  
M. Mangut ◽  
O. Gurtug
Keyword(s):  
Black Hole ◽  
Quantum Mechanics ◽  
Time Evolution ◽  
Charged Black Hole ◽  
Nonlinear Electrodynamics ◽  
Naked Singularities ◽  
Black Hole Background ◽  
Quantum Wave ◽  
Electrically Charged ◽  
Specific Quantum

The time-like naked singularities of the electrically and magnetically charged black hole solutions obtained in a model of nonlinear electrodynamics proposed by Kruglov is investigated within the framework of quantum mechanics. In view of quantum mechanics, the spacetime is quantum regular provided that the time evolution of the test quantum wave packet uniquely propagates on an underlying background. Rigorous calculations have shown that when the singularity is probed with specific quantum wave/particle modes, the quantum wave operator turns out to be essentially self-adjoint. Thus, the time evolution of the quantum wave/particle is determined uniquely. In the case of electrically charged black hole background, the unique evolution is restricted to [Formula: see text]-wave only. For the two different magnetically charged black hole backgrounds, the time evolution is restricted to different modes for each case.

scholarly journals Electrically charged black hole with scalar hair

2006 ◽  
Vol 74 (6) ◽  
Author(s):  
Cristián Martínez ◽  
Ricardo Troncoso
Keyword(s):  
Black Hole ◽  
Charged Black Hole ◽  
Scalar Hair ◽  
Electrically Charged

Accretion of dark energy onto stringy electrically charged black hole

2015 ◽  
Vol 360 (1) ◽  
Author(s):  
Jin-Ling Geng ◽  
Yu Zhang ◽  
En-Kun Li ◽  
Peng-Fei Duan
Keyword(s):  
Black Hole ◽  
Dark Energy ◽  
Charged Black Hole ◽  
Electrically Charged

scholarly journals Dynamics of Electromagnetic Fields and Structure of Regular Rotating Electrically Charged Black Holes and Solitons in Nonlinear Electrodynamics Minimally Coupled to Gravity

Universe ◽  
2019 ◽  
Vol 5 (10) ◽  
pp. 205 ◽  
Author(s):  
Irina Dymnikova ◽  
Evgeny Galaktionov
Keyword(s):  
Black Holes ◽  
Electromagnetic Fields ◽  
Nonlinear Electrodynamics ◽  
Axially Symmetric ◽  
De Sitter ◽  
Dynamical Equations ◽  
Naked Singularities ◽  
Charged Black Holes ◽  
De Sitter Vacuum ◽  
Electrically Charged

We study the dynamics of electromagnetic fields of regular rotating electrically charged black holes and solitons replacing naked singularities in nonlinear electrodynamics minimally coupled to gravity (NED-GR). They are related by electromagnetic and gravitational interactions and described by the axially symmetric NED-GR solutions asymptotically Kerr-Newman for a distant observer. Geometry is described by the metrics of the Kerr-Schild class specified by T t t = T r r ( p r = − ρ ) in the co-rotating frame. All regular axially symmetric solutions obtained from spherical solutions with the Newman-Janis algorithm belong to this class. The basic generic feature of all regular objects of this class, both electrically charged and electrically neutral, is the existence of two kinds of de Sitter vacuum interiors. We analyze the regular solutions to dynamical equations for electromagnetic fields and show which kind of a regular interior is favored by electromagnetic dynamics for NED-GR objects.

scholarly journals Electrically charged black hole on AdS3 : Scale invariance and the Smarr formula

2018 ◽  
Vol 97 (2) ◽  
Author(s):  
Cristián Erices ◽  
Oscar Fuentealba ◽  
Miguel Riquelme
Keyword(s):  
Black Hole ◽  
Scale Invariance ◽  
Charged Black Hole ◽  
Electrically Charged

scholarly journals HAWKING RADIATION FROM KERR–NEWMAN BLACK HOLE AND TUNNELING MECHANISM

2010 ◽  
Vol 25 (21) ◽  
pp. 4123-4140 ◽  
Author(s):  
KOICHIRO UMETSU
Keyword(s):  
Black Hole ◽  
Dimensional Reduction ◽  
Hawking Radiation ◽  
Charged Black Hole ◽  
Spherically Symmetric ◽  
Two Dimensional ◽  
Tunneling Mechanism ◽  
Black Hole Background ◽  
Newman Black Hole ◽  
Spherically Symmetric Metric

We present the derivation of Hawking radiation by using the tunneling mechanism in a rotating and charged black hole background. We show that the four-dimensional Kerr–Newman metric, which has a spherically nonsymmetric geometry, becomes an effectively two-dimensional spherically symmetric metric by using the technique of the dimensional reduction near the horizon. We can thus readily apply the tunneling mechanism to the nonspherical Kerr and Kerr–Newman metric.

scholarly journals Exponential nonlinear electrodynamics and backreaction effects on holographic superconductor in the Lifshitz black hole background

2017 ◽  
Vol 27 (01) ◽  
pp. 1750175 ◽  
Author(s):  
Z. Sherkatghanad ◽  
B. Mirza ◽  
F. Lalehgani Dezaki
Keyword(s):  
Black Hole ◽  
Critical Temperature ◽  
Critical Magnetic Field ◽  
Nonlinear Electrodynamics ◽  
Holographic Superconductor ◽  
Dynamical Exponent ◽  
Black Hole Background ◽  
Sturm Liouville ◽  
Lifshitz Black Hole ◽  
Exponential Nonlinear Electrodynamics

We analytically describe the properties of the s-wave holographic superconductor with the exponential nonlinear electrodynamics in the Lifshitz black hole background in four-dimensions. Employing an assumption the scalar and gauge fields backreact on the background geometry, we calculate the critical temperature as well as the condensation operator. Based on Sturm–Liouville method, we show that the critical temperature decreases with increasing exponential nonlinear electrodynamics and Lifshitz dynamical exponent, [Formula: see text], indicating that condensation becomes difficult. Also we find that the effects of backreaction has a more important role on the critical temperature and condensation operator in small values of Lifshitz dynamical exponent, while [Formula: see text] is around one. In addition, the properties of the upper critical magnetic field in Lifshitz black hole background using Sturm–Liouville approach is investigated to describe the phase diagram of the corresponding holographic superconductor in the probe limit. We observe that the critical magnetic field decreases with increasing Lifshitz dynamical exponent, [Formula: see text], and it goes to zero at critical temperature, independent of the Lifshitz dynamical exponent, [Formula: see text].

scholarly journals Volume complexity for Janus AdS3 geometries

2021 ◽  
Vol 2021 (8) ◽  
Author(s):  
Roberto Auzzi ◽  
Stefano Baiguera ◽  
Sara Bonansea ◽  
Giuseppe Nardelli ◽  
Kristian Toccacelo
Keyword(s):  
Black Hole ◽  
Time Evolution ◽  
Finite Temperature ◽  
Time Dependent ◽  
Equilibrium System ◽  
Btz Black Hole ◽  
Temperature Dependent ◽  
Logarithmic Divergence ◽  
Black Hole Background

Abstract We investigate the complexity=volume proposal in the case of Janus AdS3 geometries, both at zero and finite temperature. The leading contribution coming from the Janus interface is a logarithmic divergence, whose coefficient is a function of the dilaton excursion. In the presence of the defect, complexity is no longer topological and becomes temperature-dependent. We also study the time evolution of the extremal volume for the time-dependent Janus BTZ black hole. This background is not dual to an interface but to a pair of entangled CFTs with different values of the couplings. At late times, when the equilibrium is restored, the couplings of the CFTs do not influence the complexity rate. On the contrary, the complexity rate for the out-of-equilibrium system is always smaller compared to the pure BTZ black hole background.

scholarly journals Formation and evaporation of an electrically charged black hole in conformal gravity

2018 ◽  
Vol 78 (2) ◽  
Author(s):  
Cosimo Bambi ◽  
Leonardo Modesto ◽  
Shiladitya Porey ◽  
Lesław Rachwał
Keyword(s):  
Black Hole ◽  
Charged Black Hole ◽  
Conformal Gravity ◽  
Electrically Charged
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