Neutral Particle Motion around a Schwarzschild Black Hole in Modified Gravity

Sharif, M.; Shahzadi, Misbah

doi:10.1134/s1063776118090182

Cited by 26 publications

(12 citation statements)

References 23 publications

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“…From this point of view, one can simply use the metric with lapse function given in (2). Now one can obtain the different results with respect to ones presented in Ref [72].…”

Section: Geodesic Motionmentioning

confidence: 93%

Magnetized particle motion around magnetized Schwarzschild-MOG black hole

et al. 2020

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In this paper, we have presented the studies of the motion of magnetized particles and energetic processes around Schwarzschild black holes in modified gravity (MOG). The study of circular stable orbits shows that orbits of magnetized particles can not be stable for the values of magnetic coupling parameter $$\beta \ge 1$$β≥1. It was also shown that the range of stable circular orbits increases with the increase of both MOG and magnetic coupling parameters, while the effects of magnetic interaction stronger than the gravity. It was obtained that the increase of the MOG parameter causes the increase of center-of-mass energy collision of magnetized particles. Moreover, we have analyzed how to mimic the magnetic interaction with the spin of Kerr and Schwarzschild-MOG black holes. We have obtained that the magnetic coupling parameter can mimic the spin parameter $$a \le 0.15$$a≤0.15 ($$a \le 0.28$$a≤0.28) giving the same radius of innermost contour(co)-rotating orbits at the values of the parameter $$\beta \in (-1,1)$$β∈(-1,1) and the MOG parameter in the range $$\alpha \in (-0.17,0.28)$$α∈(-0.17,0.28) while the MOG parameter $$\alpha \in (-0.7, 0.9)$$α∈(-0.7,0.9) mimics spin parameter of the black hole with the range $$|a| \in (0,1)$$|a|∈(0,1).

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“…From this point of view, one can simply use the metric with lapse function given in (2). Now one can obtain the different results with respect to ones presented in Ref [72].…”

Section: Geodesic Motionmentioning

confidence: 93%

Magnetized particle motion around magnetized Schwarzschild-MOG black hole

et al. 2020

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“…Besides the Boyer-Lindquist coordinates, other representations of spacetime locations exist (see, for example, refs. [14,15]).…”

Section: Metric Near Spinning Black Holementioning

confidence: 99%

Black Hole Spin and Stellar Flyby Periastron Shift

Tito¹,

Павлов

2021

Universe

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For a scenario of a close flyby of a compact star near a spinning black hole, we provide analytical and numerical estimates for the shift of trajectory periastron due to relativistic (beyond post-Newtonian) effects. More specifically, we derived a generalized expression (not limited to quasi-circular or elliptical orbits) directly linking the periastron shift and the spin of the black hole. The expression permits the estimation of black hole spin based on astronomical tracking of locations of stars traveling along highly eccentric (parabolic and hyperbolic) trajectories in close vicinity of a black hole. We also demonstrate how stars traveling on hyperbolic or parabolic trajectories may be (temporarily) captured onto quasi-circular orbits around black holes, and we quantitatively examine conditions for such scenarios.

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“…If both Eqs. (32) and (33) hold true simultaneously, the spinning particle will move in a circular orbit around the rotating braneworld BH. Now, in order to find the location of the ISCO, the point where the maximum and minimum of the V ef f (+) meets, we need to introduce one more condition (i.e., Eq.…”

Section: Inner Most Stable Circular Orbit (Isco) and The Superlumimentioning

confidence: 99%

“…(34)) in addition to the conditions described by Eqs. (32) and (33). The explicit form of these three equations as shown in Appendix is used to find the behavior of the ISCO parameters as a function of the particle spin S. It is worth mentioning here that for the case of spinning particle, the four-velocity and the four-momentum are not parallel and hence the four velocity can be timelike (U 2 < 0) or spacelike (U 2 > 0), where U 2 ≡ U µ U µ .…”

Section: Inner Most Stable Circular Orbit (Isco) and The Superlumimentioning

confidence: 99%

Bounds on spinning particles in their innermost stable circular orbits around rotating braneworld black hole

2020

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We study the innermost stable circular orbit (ISCO) of a spinning test particle moving in the vicinity of an axially symmetric rotating braneworld black hole (BH). We start with the description of the event horizon, static limit surface and ergosphere region of such BH and bring out the effect of tidal charge parameter on ergosphere. It is found that the ISCO of rotating braneworld BH is very sensitive to braneworld BH deformation parameter C (also known as tidal charge parameter) in addition to its rotation parameter. We further discovered that the orbital radius of the spinning test particles changes non-monotonously with the braneworld BH deformation parameter. It is found that for rotating braneworld BH the allowed range of the particle spin grows as the tidal charge parameter C decreases, in contrast with the Kerr-Newman BH. We also found the similar behavior of the particle's spin for the braneworld Reissner-Nordström (C < 0) BH in contrast with its general relativity counterpart (i.e., Reissner-Nordström) having (C > 0).

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Neutral Particle Motion around a Schwarzschild Black Hole in Modified Gravity

Cited by 26 publications

References 23 publications

Magnetized particle motion around magnetized Schwarzschild-MOG black hole

Magnetized particle motion around magnetized Schwarzschild-MOG black hole

Black Hole Spin and Stellar Flyby Periastron Shift

Bounds on spinning particles in their innermost stable circular orbits around rotating braneworld black hole

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