scholarly journals Innermost stable circular orbit near dirty black holes in magnetic field and ultra-high-energy particle collisions

2015 ◽  
Vol 75 (9) ◽  
Author(s):  
O. B. Zaslavskii
Keyword(s):  
Magnetic Field ◽  
Black Holes ◽  
Circular Orbit ◽  
High Energy ◽  
High Energy Particle ◽  
Ultra High Energy ◽  
Particle Collisions ◽  
Energy Particle ◽  
Stable Circular Orbit ◽  
Innermost Stable Circular Orbit

scholarly journals Kinematics of ultra-high energy particle collisions near black holes in the magnetic field

2015 ◽  
Vol 30 (06) ◽  
pp. 1550027 ◽  
Author(s):  
O. B. Zaslavskii
Keyword(s):  
Magnetic Field ◽  
Black Holes ◽  
Center Of Mass ◽  
High Energy ◽  
High Energy Particle ◽  
Ultra High Energy ◽  
Particle Collisions ◽  
Mass Frame ◽  
Bsw Effect ◽  
The Magnetic Field

There are different versions of collisions of two particles near black holes with unbound energy E cm in the center of mass frame. The so-called BSW effect arises when a slow fine-tuned "critical" particle hits a rapid "usual" one. We discuss a scenario of collision in the strong magnetic field for which explanation turns out to be different. Both particles are rapid but the nonzero angle between their velocities (which are both close to c, the speed of light) results in a relative velocity close to c and, hence, big E cm .

Magnetic field and radius of the innermost stable circular orbit near super-massive black holes in active galactic nuclei

2015 ◽  
Vol 336 (10) ◽  
pp. 1013-1016 ◽  
Author(s):  
M. Yu. Piotrovich ◽  
Yu. N. Gnedin ◽  
N. A. Silant'ev ◽  
T. M. Natsvlishvili ◽  
S. D. Buliga
Keyword(s):  
Magnetic Field ◽  
Black Holes ◽  
Active Galactic Nuclei ◽  
Circular Orbit ◽  
Galactic Nuclei ◽  
Massive Black Holes ◽  
Stable Circular Orbit ◽  
Innermost Stable Circular Orbit

scholarly journals Lyapunov exponent, ISCO and Kolmogorov–Senai entropy for Kerr–Kiselev black hole

2021 ◽  
Vol 81 (1) ◽  
Author(s):  
Monimala Mondal ◽  
Farook Rahaman ◽  
Ksh. Newton Singh
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Lyapunov Exponent ◽  
Circular Orbit ◽  
Real Root ◽  
Angular Frequency ◽  
Geodesic Motion ◽  
Radial Equation ◽  
Stable Circular Orbit ◽  
Innermost Stable Circular Orbit

AbstractGeodesic motion has significant characteristics of space-time. We calculate the principle Lyapunov exponent (LE), which is the inverse of the instability timescale associated with this geodesics and Kolmogorov–Senai (KS) entropy for our rotating Kerr–Kiselev (KK) black hole. We have investigate the existence of stable/unstable equatorial circular orbits via LE and KS entropy for time-like and null circular geodesics. We have shown that both LE and KS entropy can be written in terms of the radial equation of innermost stable circular orbit (ISCO) for time-like circular orbit. Also, we computed the equation marginally bound circular orbit, which gives the radius (smallest real root) of marginally bound circular orbit (MBCO). We found that the null circular geodesics has larger angular frequency than time-like circular geodesics ($$Q_o > Q_{\sigma }$$ Q o > Q σ ). Thus, null-circular geodesics provides the fastest way to circulate KK black holes. Further, it is also to be noted that null circular geodesics has shortest orbital period $$(T_{photon}< T_{ISCO})$$ ( T photon < T ISCO ) among the all possible circular geodesics. Even null circular geodesics traverses fastest than any stable time-like circular geodesics other than the ISCO.

scholarly journals Ultrahigh-Energy multi-messengers at the Pierre Auger Observatory

2019 ◽  
Vol 209 ◽  
pp. 01053
Author(s):  
Francisco Pedreira
Keyword(s):  
Gravitational Waves ◽  
High Energy ◽  
Pierre Auger Observatory ◽  
High Energy Particle ◽  
Ultra High Energy ◽  
Ultrahigh Energy ◽  
Particle Detector ◽  
Energy Particle ◽  
Binary Mergers ◽  
The Universe

The study of correlations between observations of different messengers from extreme sources of the Universe has emerged as an outstanding way to make progress in astrophysics. The Pierre Auger Observatory is capable of significant contributions as an ultra-high energy particle detector, particularly through its capability to search for inclined showers produced by neutrinos. We describe the neutrino searches made with the Observatory with particular emphasis on the recent results following the detections of gravitational waves from binary mergers with Advanced LIGO and VIRGO, leading to competitive limits.

scholarly journals Rotation as an origin of high energy particle collisions

2016 ◽  
Vol 31 (04) ◽  
pp. 1650029 ◽  
Author(s):  
O. B. Zaslavskii
Keyword(s):  
Center Of Mass ◽  
High Energy ◽  
High Energy Particle ◽  
Particle Collisions ◽  
Energy Particle ◽  
Relativistic Stars ◽  
Mass Frame ◽  
Model Independent

We consider collision of two particles in rotating spacetimes without horizons. If the metric coefficient responsible for rotation of spacetime is big enough, the energy of collisions in the center of mass frame can be as large as one likes. This can happen in the ergoregion only. The results are model-independent and apply both to relativistic stars and wormholes.

scholarly journals New Scenarios of High-Energy Particle Collisions Near Wormholes

Universe ◽  
2020 ◽  
Vol 6 (12) ◽  
pp. 227
Author(s):  
Oleg B. Zaslavskii
Keyword(s):  
Center Of Mass ◽  
High Energy ◽  
Large Energy ◽  
High Energy Particle ◽  
Particle Collisions ◽  
Energy Particle ◽  
Wormhole Throat ◽  
Penrose Process ◽  
High Energy Collisions

We suggest two new scenarios of high-energy particle collisions in the background of a wormhole. In scenario 1, the novelty consists of the fact that the effect does not require two particles coming from different mouths. Instead, all such scenarios of high energy collisions develop, when an experimenter sends particles towards a wormhole from the same side of the throat. For static wormholes, this approach leads to indefinitely large energy in the center of mass. For rotating wormholes, it makes possible the super-Penrose process (unbounded energies measured at infinity). In scenario 2, one of colliding particles oscillates near the wormhole throat from the very beginning. In this sense, scenario 2 is intermediate between the standard one and scenario 1 since the particle under discussion does not come from infinity at all.

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