scholarly journals Electric Penrose process: High-energy acceleration of ionized particles by nonrotating weakly charged black hole

2021 ◽  
Vol 104 (8) ◽  
Author(s):  
Arman Tursunov ◽  
Bakhtinur Juraev ◽  
Zdeněk Stuchlík ◽  
Martin Kološ
Keyword(s):  
Black Hole ◽  
High Energy ◽  
Charged Black Hole ◽  
Penrose Process

scholarly journals DO ACTIVE GALACTIC NUCLEI CONVERT DARK MATTER INTO VISIBLE PARTICLES?

2008 ◽  
Vol 23 (16) ◽  
pp. 1151-1159 ◽  
Author(s):  
A. A. GRIB ◽  
YU. V. PAVLOV
Keyword(s):  
Black Hole ◽  
Dark Matter ◽  
Active Galactic Nuclei ◽  
Galactic Nuclei ◽  
High Energy ◽  
Grand Unification ◽  
Ultra High Energy ◽  
High Energy Cosmic Rays ◽  
Opposite Process ◽  
Penrose Process

The hypothesis that dark matter consists of superheavy particles with the mass close to the Grand Unification scale is investigated. These particles were created from vacuum by the gravitation of the expanding Universe and their decay led to the observable baryon charge. Some part of these particles with the lifetime larger than the time of breaking of the Grand Unification symmetry became metastable and survived up to the modern time as dark matter. However, in active galactic nuclei due to large energies of dark matter particles swallowed by the black hole and the possibility of the Penrose process for rotating black hole the opposite process can occur. Dark matter particles become interacting. Their decay on visible particles at the Grand Unification energies leads to the flow of ultra high energy cosmic rays observed by the Auger group. Numerical estimates of the effect leading to the observable numbers are given.

scholarly journals Impact of Thermal Fluctuations on Logarithmic Corrected Massive Gravity Charged Black Hole

Entropy ◽  
2021 ◽  
Vol 23 (10) ◽  
pp. 1269
Author(s):  
Abdul Jawad ◽  
Shahid Chaudhary ◽  
Kazuharu Bamba
Keyword(s):  
Black Hole ◽  
Free Energy ◽  
Thermal Fluctuations ◽  
High Energy ◽  
Massive Gravity ◽  
Charged Black Hole ◽  
Nonlinearity Parameter ◽  
Thermodynamic Quantities ◽  
Substantial Impact ◽  
The Stability

We investigate the influence of the first-order correction of entropy caused by thermal quantum fluctuations on the thermodynamics of a logarithmic corrected charged black hole in massive gravity. For this black hole, we explore the thermodynamic quantities, such as entropy, Helmholtz free energy, internal energy, enthalpy, Gibbs free energy and specific heat. We discuss the influence of the topology of the event horizon, dimensions and nonlinearity parameter on the local and global stability of the black hole. As a result, it is found that the holographic dual parameter vanishes. This means that the thermal corrections have no significant role to disturb the holographic duality of the logarithmic charged black hole in massive gravity, although the thermal corrections have a substantial impact on the thermodynamic quantities in the high-energy limit and the stability conditions of black holes.

scholarly journals Fifty Years of Energy Extraction from Rotating Black Hole: Revisiting Magnetic Penrose Process

Universe ◽  
2019 ◽  
Vol 5 (5) ◽  
pp. 125 ◽  
Author(s):  
Arman Tursunov ◽  
Naresh Dadhich
Keyword(s):  
Black Hole ◽  
Process Mining ◽  
Thought Experiment ◽  
High Energy ◽  
Radio Bursts ◽  
Ultra High Energy ◽  
Relativistic Jets ◽  
High Energy Cosmic Rays ◽  
Penrose Process ◽  
Viable Mechanism

Magnetic Penrose process (MPP) is not only the most exciting and fascinating process mining the rotational energy of black hole but it is also the favored astrophysically viable mechanism for high energy sources and phenomena. It operates in three regimes of efficiency, namely low, moderate and ultra, depending on the magnetization and charging of spinning black holes in astrophysical setting. In this paper, we revisit MPP with a comprehensive discussion of its physics in different regimes, and compare its operation with other competing mechanisms. We show that MPP could in principle foot the bill for powering engine of such phenomena as ultra-high-energy cosmic rays, relativistic jets, fast radio bursts, quasars, AGNs, etc. Further, it also leads to a number of important observable predictions. All this beautifully bears out the promise of a new vista of energy powerhouse heralded by Roger Penrose half a century ago through this process, and it has today risen in its magnetically empowered version of mid 1980s from a purely thought experiment of academic interest to a realistic powering mechanism for various high-energy astrophysical phenomena.

scholarly journals Regular charged black hole construction in dimensions

2012 ◽  
Vol 376 (8-9) ◽  
pp. 893-898 ◽  
Author(s):  
S. Habib Mazharimousavi ◽  
M. Halilsoy ◽  
T. Tahamtan
Keyword(s):  
Black Hole ◽  
Charged Black Hole

scholarly journals New non-extremal and BPS hairy black holes in gauged $$ \mathcal{N} $$ = 2 and $$ \mathcal{N} $$ = 8 supergravity

2021 ◽  
Vol 2021 (4) ◽  
Author(s):  
Andres Anabalon ◽  
Dumitru Astefanesei ◽  
Antonio Gallerati ◽  
Mario Trigiante
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Boundary Conditions ◽  
Charged Black Hole ◽  
Dual Theory ◽  
Real Numbers ◽  
Hairy Black Holes ◽  
Interpolation Parameter ◽  
Black Hole Solutions ◽  
Extremal Black Holes

Abstract In this article we study a family of four-dimensional, $$ \mathcal{N} $$ N = 2 supergravity theories that interpolates between all the single dilaton truncations of the SO(8) gauged $$ \mathcal{N} $$ N = 8 supergravity. In this infinitely many theories characterized by two real numbers — the interpolation parameter and the dyonic “angle” of the gauging — we construct non-extremal electrically or magnetically charged black hole solutions and their supersymmetric limits. All the supersymmetric black holes have non-singular horizons with spherical, hyperbolic or planar topology. Some of these supersymmetric and non-extremal black holes are new examples in the $$ \mathcal{N} $$ N = 8 theory that do not belong to the STU model. We compute the asymptotic charges, thermodynamics and boundary conditions of these black holes and show that all of them, except one, introduce a triple trace deformation in the dual theory.

OBSERVATIONAL CONSTRAINTS ON STRONG GRAVITY

2011 ◽  
Vol 20 (14) ◽  
pp. 2755-2760
Author(s):  
CHRIS DONE
Keyword(s):  
Black Hole ◽  
Event Horizon ◽  
Strong Field ◽  
Field Tests ◽  
High Energy ◽  
Observational Constraints ◽  
Tests Of General Relativity ◽  
Strong Gravity ◽  
Accretion Flows ◽  
Spacetime Curvature

Accretion onto a black hole transforms the darkest objects in the universe to the brightest. The high energy radiation emitted from the accretion flow before it disappears forever below the event horizon lights up the regions of strong spacetime curvature close to the black hole, enabling strong field tests of General Relativity. I review the observational constraints on strong gravity from such accretion flows, and show how the data strongly support the existence of such fundamental General Relativistic features of a last stable orbit and the event horizon. However, these successes also imply that gravity does not differ significantly from Einstein's predictions above the event horizon, so any new theory of quantum gravity will be very difficult to test.

scholarly journals Quantum fluxes at the inner horizon of a near-extremal spherical charged black hole

2021 ◽  
Vol 104 (2) ◽  
Author(s):  
Noa Zilberman ◽  
Amos Ori
Keyword(s):  
Black Hole ◽  
Charged Black Hole ◽  
Inner Horizon

scholarly journals Energetics of a rotating charged black hole in 5-dimensional supergravity

2010 ◽  
Vol 81 (2) ◽  
Author(s):  
Kartik Prabhu ◽  
Naresh Dadhich
Keyword(s):  
Black Hole ◽  
Charged Black Hole

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

scholarly journals Particle Acceleration Driven by Null Electromagnetic Fields Near a Kerr Black Hole

Universe ◽  
2020 ◽  
Vol 7 (1) ◽  
pp. 1
Author(s):  
Yasufumi Kojima ◽  
Yuto Kimura
Keyword(s):  
Black Hole ◽  
Particle Acceleration ◽  
Free Field ◽  
Kerr Black Hole ◽  
High Energy ◽  
Maximum Energy ◽  
Dimensionless Number ◽  
Massive Black Hole ◽  
Relativistic Regime ◽  
Force Free Field

Short timescale variability is often associated with a black hole system. The consequence of an electromagnetic outflow suddenly generated near a Kerr black hole is considered assuming that it is described by a solution of a force-free field with a null electric current. We compute charged particle acceleration induced by the burst field. We show that the particle is instantaneously accelerated to the relativistic regime by the field with a very large amplitude, which is characterized by a dimensionless number κ. Our numerical calculation demonstrates how the trajectory of the particle changes with κ. We also show that the maximum energy increases with κ2/3. The typical maximum energy attained by a proton for an event near a super massive black hole is Emax∼100 TeV, which is enough observed high-energy flares.

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