scholarly journals Innermost stable circular orbit of charged particles in Reissner-Nordström, Kerr-Newman, and Kerr-Sen spacetimes

2021 ◽  
Vol 103 (2) ◽  
Author(s):  
Kris Schroven ◽  
Saskia Grunau
Keyword(s):  
Circular Orbit ◽  
Charged Particles ◽  
Stable Circular Orbit ◽  
Innermost Stable Circular Orbit

scholarly journals Epicyclic oscillations of charged particles in stationary solutions immersed in a magnetic field with application to the Kerr–Newman black hole

2019 ◽  
Vol 28 (01) ◽  
pp. 1950013 ◽  
Author(s):  
Mustapha Azreg-Aïnou
Keyword(s):  
Magnetic Field ◽  
Black Hole ◽  
Circular Orbit ◽  
Uniform Magnetic Field ◽  
Charged Particles ◽  
Stationary Solutions ◽  
Stable Circular Orbit ◽  
Newman Black Hole ◽  
Innermost Stable Circular Orbit ◽  
Physical Consequences

We consider a stationary metric immersed in a uniform magnetic field and determine the general expressions for the epicyclic frequencies of charged particles. Applications to the Kerr–Newman black hole are reached of physical consequences and reveal some new effects among which are the existence of radially and vertically stable circular orbits in the region enclosed by the event horizon and the so-called “innermost” stable circular orbit (ISCO) in the plane of symmetry.

scholarly journals Gravitational self-force and the effective-one-body formalism between the innermost stable circular orbit and the light ring

2012 ◽  
Vol 86 (10) ◽  
Author(s):  
Sarp Akcay ◽  
Leor Barack ◽  
Thibault Damour ◽  
Norichika Sago
Keyword(s):  
Circular Orbit ◽  
Stable Circular Orbit ◽  
Innermost Stable Circular Orbit ◽  
Self Force ◽  
Light Ring

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.

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 Innermost stable circular orbit of a spinning particle in Kerr spacetime

1998 ◽  
Vol 58 (2) ◽  
Author(s):  
Shingo Suzuki ◽  
Kei-ichi Maeda
Keyword(s):  
Circular Orbit ◽  
Spinning Particle ◽  
Kerr Spacetime ◽  
Stable Circular Orbit ◽  
Innermost Stable Circular Orbit

scholarly journals Leaving the innermost stable circular orbit: the inner edge of a black-hole accretion disk at various luminosities

2010 ◽  
Vol 521 ◽  
pp. A15 ◽  
Author(s):  
M. A. Abramowicz ◽  
M. Jaroszyński ◽  
S. Kato ◽  
J.-P. Lasota ◽  
A. Różańska ◽  
...  
Keyword(s):  
Black Hole ◽  
Accretion Disk ◽  
Circular Orbit ◽  
Black Hole Accretion ◽  
Stable Circular Orbit ◽  
Innermost Stable Circular Orbit ◽  
Black Hole Accretion Disk ◽  
Hole Accretion

scholarly journals Performance of astrometric detection of a hotspot orbiting on the innermost stable circular orbit of the Galactic Centre black hole

2011 ◽  
Vol 412 (4) ◽  
pp. 2653-2664 ◽  
Author(s):  
F. H. Vincent ◽  
T. Paumard ◽  
G. Perrin ◽  
L. Mugnier ◽  
F. Eisenhauer ◽  
...  
Keyword(s):  
Black Hole ◽  
Circular Orbit ◽  
Galactic Centre ◽  
Stable Circular Orbit ◽  
Innermost Stable Circular Orbit

scholarly journals Circular orbits in the Taub–NUT and massless Taub–NUT spacetime

2017 ◽  
Vol 14 (07) ◽  
pp. 1750101
Author(s):  
Parthapratim Pradhan
Keyword(s):  
Black Hole ◽  
Circular Orbit ◽  
Center Of Mass ◽  
Null Geodesic ◽  
Spherically Symmetric ◽  
Potential Well ◽  
Killing Horizon ◽  
Stable Circular Orbit ◽  
Innermost Stable Circular Orbit

In this work, we study the equatorial causal geodesics of the Taub–NUT (TN) spacetime in comparison with massless TN spacetime. We emphasized both on the null circular geodesics and time-like circular geodesics. From the effective potential diagram of null and time-like geodesics, we differentiate the geodesics structure between TN spacetime and massless TN spacetime. It has been shown that there is a key role of the NUT parameter to changes the shape of pattern of the potential well in the NUT spacetime in comparison with massless NUT spacetime. We compared the innermost stable circular orbit (ISCO), marginally bound circular orbit (MBCO) and circular photon orbit (CPO) of the said spacetime with graphically in comparison with massless cases. Moreover, we compute the radius of ISCO, MBCO and CPO for extreme TN black hole (BH). Interestingly, we show that these three radii coincides with the Killing horizon, i.e. the null geodesic generators of the horizon. Finally in Appendix A, we compute the center-of-mass (CM) energy for TN BH and massless TN BH. We show that in both cases, the CM energy is finite. For extreme NUT BH, we found that the diverging nature of CM energy. First, we have observed that a non-asymptotic flat, spherically symmetric and stationary extreme BH showing such feature.

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