scholarly journals N-Black hole stationary and axially symmetric solutions of the einstein/maxwell equations

1996 ◽  
Vol 21 (9-10) ◽  
pp. 1389-1430 ◽  
Author(s):  
Gilbert Weinstein
Keyword(s):  
Black Hole ◽  
Maxwell Equations ◽  
Axially Symmetric

scholarly journals The Einstein–Dirac–Maxwell equations: Black hole solutions

2001 ◽  
Vol 8 (4) ◽  
pp. 623-634 ◽  
Author(s):  
F. Finster ◽  
J. A. Smoller ◽  
S. T. Yau
Keyword(s):  
Black Hole ◽  
Maxwell Equations ◽  
Black Hole Solutions

scholarly journals High-energy collision of particles in the magnetic field far from black holes

2014 ◽  
Vol 29 (29) ◽  
pp. 1450151
Author(s):  
O. B. Zaslavskii
Keyword(s):  
Magnetic Field ◽  
Black Hole ◽  
Center Of Mass ◽  
High Energy ◽  
Axially Symmetric ◽  
High Energy Collision ◽  
Mass Frame ◽  
Symmetric Black Hole ◽  
Rotating Star ◽  
The Magnetic Field

We consider collision of two particles in the axially symmetric black hole metric in the magnetic field. If the value of the angular momentum |L| of one particles grows unbound (but its Killing energy remains fixed) one can achieve unbound energy in the center-of-mass frame E c.m. In the absence of the magnetic field, collision of this kind is known to happen in the ergoregion. However, if the magnetic field strength B is also large, with the ratio |L|/B being finite, large E c.m. can be achieved even far from a black hole, in the almost flat region. Such an effect also occurs in the metric of a rotating star.

scholarly journals INSTABILITY OF THE BLACK HOLE HORIZON WITH RESPECT TO ELECTROMAGNETIC EXCITATIONS

2009 ◽  
Vol 18 (14) ◽  
pp. 2351-2356 ◽  
Author(s):  
ALEXANDER BURINSKII
Keyword(s):  
Black Hole ◽  
Exact Solutions ◽  
Maxwell Equations ◽  
Information Loss ◽  
Black Hole Horizon ◽  
Back Reaction ◽  
Vacuum Fluctuations

Analyzing exact solutions to the Einstein–Maxwell equations in the Kerr–Schild formalism, we show that the black hole horizon is unstable with respect to electromagnetic excitations. Contrary to perturbative smooth harmonic solutions, the exact solutions for electromagnetic excitations on the Kerr background are accompanied by singular beams which have very strong back-reaction to the metric and break the horizon, forming the holes which allow radiation to escape from the interior of the black hole. As a result, even the weak vacuum fluctuations break the horizon topologically, covering it by a set of fluctuating microholes. We conclude with a series of nontrivial consequences, one of which is that there is no information loss inside of the black hole.

scholarly journals Reissner–Nordstrom metric in unimodular theory of gravity

2017 ◽  
Vol 26 (08) ◽  
pp. 1750082 ◽  
Author(s):  
Pankaj Chaturvedi ◽  
Naveen K. Singh ◽  
Dharm Veer Singh
Keyword(s):  
Black Hole ◽  
Maxwell Equations ◽  
Black Hole Solution ◽  
Magnetic Charge ◽  
Einstein Field Equation ◽  
Einstein Gravity ◽  
Thermodynamical Properties ◽  
Electromagnetic Field Strength ◽  
Strength Tensor ◽  
Gravitational Background

We study the modified Reissner–Nordstrom (RN) metric in the unimodular gravity. So far the spherical symmetric Einstein field equation in unimodular gravity has been studied in the absence of any source. We consider static electric and magnetic charge as source. We solve for Maxwell equations in unimodular gravitational background. We show that in unimodular gravity, the electromagnetic field strength tensor is modified. We also show that the solution in unimodular gravity differs from the usual RN metric in Einstein gravity with some corrections. We further study the thermodynamical properties of the RN black hole solution in this theory.

scholarly journals Particles collision near Kerr–Sen Dilaton-Axion black hole

2019 ◽  
Vol 35 (07) ◽  
pp. 2050033 ◽  
Author(s):  
Ujjal Debnath
Keyword(s):  
Black Hole ◽  
Effective Potential ◽  
Circular Orbit ◽  
Center Of Mass ◽  
Particle Accelerator ◽  
Cauchy Horizon ◽  
Mass Energy ◽  
Axially Symmetric ◽  
Neutral Particles ◽  
Center Of Mass Energy

Here, we consider axially symmetric, stationary, rotating and charged Kerr–Sen Dilaton-Axion black hole as particle accelerator. We find the effective potential and discuss the circular orbit of a particle. We investigate the center of mass energy of two colliding neutral particles with different rest masses falling from rest at infinity to near the non-extremal horizons (event horizon and Cauchy horizon) and extremal horizon of the Kerr–Sen Dilaton-Axion black hole. Analogous to the Compton process, we discuss the collision of a particle and a massless photon. Finally, we find the center of mass energy due to the collision of two photons in the background of Kerr–Sen Dilaton-Axion black hole.

scholarly journals Two mass conjectures on axially symmetric black hole-disk systems

2019 ◽  
Vol 99 (2) ◽  
Author(s):  
Wojciech Kulczycki ◽  
Patryk Mach ◽  
Edward Malec
Keyword(s):  
Black Hole ◽  
Axially Symmetric ◽  
Symmetric Black Hole

ACCELERATION OF PARTICLES AS A UNIVERSAL PROPERTY OF ERGOSPHERE

2013 ◽  
Vol 28 (11) ◽  
pp. 1350037 ◽  
Author(s):  
O. B. ZASLAVSKII
Keyword(s):  
Black Hole ◽  
Angular Momentum ◽  
Recent Observation ◽  
Center Of Mass ◽  
Kerr Black Hole ◽  
Acceleration Of Particles ◽  
Axially Symmetric ◽  
Fixed Energy ◽  
Mass Frame

We show that recent observation made by Grib and Pavlov, [A. A. Grib and Yu. V. Pavlov, Europhys. Lett.101, 20004 (2013)] for the Kerr black hole is valid in the general case of rotating axially symmetric metric. Namely, collision of two particles in the ergosphere leads to indefinite growth of the energy in the center-of-mass frame, provided the angular momentum of one of the two particles is negative and increases without limit for a fixed energy at infinity. General approach enabled us to elucidate why the role of the ergosphere is crucial in this process.

Sign in / Sign up

Export Citation Format

Share Document