scholarly journals Spinning dilaton black hole in 2 + 1 dimensions as a particle accelerator

2017 ◽  
Vol 32 (13) ◽  
pp. 1750074 ◽  
Author(s):  
Sharmanthie Fernando
Keyword(s):  
Black Hole ◽  
String Theory ◽  
Center Of Mass ◽  
Low Energy ◽  
Particle Accelerator ◽  
Particle Collision ◽  
Dilaton Black Hole

In this paper, we have studied particle collision around a spinning dilaton black hole in 2 + 1 dimensions. This black hole is a solution to the low-energy string theory in 2 + 1 dimensions. Time-like geodesics are presented in detail and the center-of-mass (CM) energy of two-particle collision at the horizon of a spinning black hole is considered. We noticed that there is a possibility of the two masses to create infinite CM energy.

scholarly journals Charged dilaton black hole in 2 + 1 dimensions as a particle accelerator

2017 ◽  
Vol 32 (16) ◽  
pp. 1750088 ◽  
Author(s):  
Sharmanthie Fernando
Keyword(s):  
Black Hole ◽  
Center Of Mass ◽  
Charged Particles ◽  
Low Energy ◽  
Particle Accelerator ◽  
Mass Energy ◽  
Particle Collisions ◽  
Critical Charge ◽  
Center Of Mass Energy ◽  
Dilaton Black Hole

In this paper, we have studied particle collisions around a charged dilaton black hole in 2 + 1 dimensions. This black hole is a solution to the low energy string action in 2 + 1 dimensions. Time-like geodesics for charged particles are studied in detail. The center-of-mass energy for two charged particles colliding closer to the horizon is calculated and shown to be infinite if one of the particles has the critical charge.

scholarly journals Black hole with a scalar field as a particle accelerator

2017 ◽  
Vol 26 (10) ◽  
pp. 1750108 ◽  
Author(s):  
O. B. Zaslavskii
Keyword(s):  
Black Hole ◽  
Scalar Field ◽  
Center Of Mass ◽  
High Energy ◽  
Particle Accelerator ◽  
Particle Collision ◽  
Axially Symmetric ◽  
Speed Of Light ◽  
Test Particles ◽  
Energy Formula

We consider stationary axially symmetric black holes with the background scalar field and test particles that can interact with this field directly. Then, particle collision near a black hole can lead to the unbounded energy [Formula: see text] in the center of mass frame (contrary to some recent claims in literature). This happens always if one of the particles is neutral whereas another one has nonzero scalar charge. Kinematically, two cases occur here. (i) A neutral particle approaches the horizon with the speed of light while the velocity of the charged one remains separated from it (this is direct analogue of the situation with collision of geodesic particles.). (ii) Both particles approach the horizon with the speed almost equal to that of light but with different rates. As a result, in both cases the relative velocity also approaches the speed of light, so that [Formula: see text] becomes unbounded. We consider also a case when the metric coefficient [Formula: see text] near a black hole. Then, overlap between the geometric factor and the presence of the scalar field opens additional scenarios in which unbounded energy [Formula: see text] is possible as well. We give a full list of possible scenarios of high-energy collisions for the situations considered.

Acoustic black hole in 2 + 1 dimensions as a particle accelerator

2019 ◽  
Vol 35 (08) ◽  
pp. 2050042
Author(s):  
Sharmanthie Fernando
Keyword(s):  
Black Hole ◽  
Fluid Flow ◽  
Center Of Mass ◽  
Particle Accelerator ◽  
Fine Tuning ◽  
Particle Collision ◽  
Mass Energy ◽  
Center Of Mass Energy ◽  
Infinite Center

In this paper, we have studied particle collision around a rotating acoustic black hole in 2 + 1 dimensions. This black hole is analog to a fluid flow in a draining bath tub with a sink. Center of mass energy for two-particle collision at the horizon of the rotating acoustic black hole is considered. There is a possibility of the two-mass collision to create infinite center of mass energy for certain fine tuning of the parameters of the 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 Collision of particles near a three-dimensional rotating Hořava AdS black hole

2021 ◽  
Vol 81 (3) ◽  
Author(s):  
Ramón Bécar ◽  
P. A. González ◽  
Yerko Vásquez
Keyword(s):  
Black Hole ◽  
Angular Momentum ◽  
Lorentz Invariance ◽  
Center Of Mass ◽  
Three Dimensional ◽  
Particle Accelerator ◽  
Btz Black Hole ◽  
Center Of Mass Energy ◽  
Horava Gravity ◽  
Critical Angular Momentum

AbstractWe consider a three-dimensional rotating AdS black hole, which is a solution of Hořava gravity in the low-energy limit that corresponds to a Lorentz-violating version of the BTZ black hole, and we analyze the effect of the breaking of Lorentz invariance on the possibility that the black hole can act as a particle accelerator by analyzing the energy in the center-of-mass (CM) frame of two colliding particles in the vicinity of its horizons. We find that the critical angular momentum of particles increases when the Hořava parameter $$\xi $$ ξ increases and when the aether parameter b increases. Also, the particles can collide on the inner horizon with arbitrarily high CM energy if one of the particles has a critical angular momentum, possible for the BSW process. Here it is essential that, while for the extremal BTZ black hole the particles with critical angular momentum only can exist on the degenerate horizon, for the Lorentz-violating version of the BTZ black hole the particle with critical angular momentum can exist in a region away from the degenerate horizon. It is worth mentioning that the results exposed in this manuscript can be applied for the covariant version of Hořava gravity, where the covariant definition of the center-of-mass energy is well defined.

scholarly journals Dilaton black hole entropy from entropy function formalism

2019 ◽  
Vol 79 (9) ◽  
Author(s):  
Komeil Babaei Velni ◽  
Ali Jalali ◽  
Bahareh Khoshdelan
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
String Theory ◽  
Black Hole Entropy ◽  
Entropy Function ◽  
Extremum Point ◽  
Function Formalism ◽  
Dilaton Black Hole

Abstract It has been shown that the entropy function formalism is an efficient way to calculate the entropy of black holes in string theory. We check this formalism for the extremal charged dilaton black hole. We find the general four-derivative correction on the black hole entropy from the value of the entropy function at its extremum point.

scholarly journals Particle Collision Near 1 + 1-Dimensional Horava-Lifshitz Black Hole and Naked Singularity

2017 ◽  
Vol 2017 ◽  
pp. 1-7 ◽  
Author(s):  
M. Halilsoy ◽  
A. Ovgun
Keyword(s):  
Black Hole ◽  
Center Of Mass ◽  
Massive Particle ◽  
Naked Singularity ◽  
Power Counting ◽  
Particle Collision ◽  
Naked Singularities ◽  
Angular Momenta ◽  
Lifshitz Black Hole ◽  
Explosive Process

The unbounded center-of-mass (CM) energy of oppositely moving colliding particles near horizon emerges also in 1+1-dimensional Horava-Lifshitz gravity. This theory has imprints of renormalizable quantum gravity characteristics in accordance with the method of simple power counting. Surprisingly the result obtained is not valid for a 1-dimensional Compton-like process between an outgoing photon and an infalling massless/massive particle. It is possible to achieve unbounded CM energy due to collision between infalling photons and particles. The source of outgoing particles may be attributed to an explosive process just outside the horizon for a black hole and the naturally repulsive character for the case of a naked singularity. It is found that absence of angular momenta in 1+1-dimension does not yield unbounded energy for collisions in the vicinity of naked singularities.

ENERGY-MOMENTUM COMPLEXES FOR A STRINGY BLACK HOLE GEOMETRY IN A LOW-ENERGY EFFECTIVE STRING THEORY

2009 ◽  
Vol 24 (08n09) ◽  
pp. 1606-1609 ◽  
Author(s):  
I. RADINSCHI ◽  
TH. GRAMMENOS
Keyword(s):  
Black Hole ◽  
String Theory ◽  
Momentum Distribution ◽  
Low Energy ◽  
Scalar Charge ◽  
Momentum Distributions ◽  
Hole Geometry ◽  
Energy And Momentum ◽  
Effective String Theory

The energy and momentum distributions for a four-dimensional, magnetically charged, stringy black hole geometry, in a low-energy effective string theory, are calculated. To this purpose, the energy-momentum complexes of Einstein, Landau-Lifshitz, Weinberg and Møller are applied. It is found that, in all four prescriptions, the momentum distribution vanishes, while the energies obtained differ, but all are functions of the mass, the scalar charge, and the boost parameter.

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