Particle collisions in ergoregion of braneworld Kerr black hole

Khan, Saeed Ullah; Shahzadi, Misbah; Ren, Jing

doi:10.1016/j.dark.2019.100331

Cited by 32 publications

(12 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Henceforth, studying a BH's shadow will be a fruitful way for a better understanding of astrophysical BHs, as well as for the comparison of general relativity to those of modern theories [29]. To have information on BHs, the approaches of null geodesics and gravitational lensing are of compelling interest [30,31,32]. Recently, scientists have finally succeeded in obtaining the first-ever image of a supermassive BH, at the centre of the M87 galaxy [33,34,35].…”

Section: Introductionmentioning

confidence: 99%

Shadow cast by a rotating charged black hole in quintessential dark energy

Khan,

Ren

2020

Preprint

Self Cite

View full text Add to dashboard Cite

The existence of quintessential dark energy around a black hole has considerable consequences on its spacetime geometry. Hence, in this article, we explore its effect on horizons and the silhouette generated by a Kerr-Newman black hole in quintessential dark energy. Moreover, to analyse the deflection angle of light, we utilize the Gauss-Bonnet theorem. The obtained result demonstrates that, due to the dragging effect, the black hole spin elongates its shadow in the direction of the rotational axis, while increases the deflection angle. On the other hand, the black hole charge diminishing its shadow, as well as the angle of light's deflection. Besides, both spin and charge significantly increase the distortion effect in the black hole's shadow. The quintessence parameter γ, increases the shadow radius, while decreases the distortion effect at higher values of charge and spin parameters.

show abstract

Section: Introductionmentioning

confidence: 99%

Shadow cast by a rotating charged black hole in quintessential dark energy

Khan,

Ren

2020

Preprint

Self Cite

View full text Add to dashboard Cite

show abstract

“…Tidal charges allow black holes to spin faster than extreme Kerr black hole. Tidal charge increases the efficiency of energy extraction from the black hole via the Penrose process [115]. The size of the event horizon plays also an important role in the quantity of energy which can be extracted from the black hole.…”

Section: Graphical Analysis For Plasma Mediummentioning

confidence: 99%

Weak deflection angle of Kazakov-Solodukhin black hole in plasma medium using Gauss-Bonnet theorem and its greybody bonding

Javed,

Hussain,

Övgün

2022

Preprint

View full text Add to dashboard Cite

In this paper, we study light rays in a Kazakov-Solodukhin black hole. To this end, we use the optical geometry of the Kazakov-Solodukhin black hole within the Gauss-bonnet theorem. We first show the effect of the deformation parameter a on the Gaussian optical curvature, and then we use the modern method popularized by Gibbons and Werner to calculate the weak deflection angle of light. Our calculations of deflection angle show how gravitational lensing is affected by the deformation parameter a. Moreover, we demonstrate the effect of a plasma medium on weak gravitational lensing by the Kazakov-Solodukhin black hole. We discuss that the increasing the deformation parameter a, will increase the weak deflection angle of the black hole. Our analysis also uncloak how one may find a observational evidence for a deformation parameter on the deflection angle. In addition, we studied the rigorous bounds of the Kazakov-Solodukhin black hole for the grey body factor and also studied the graphical behaviour of the bounds by fixing l = 0 and M = 1 and observed that increasing the deformation parameter a will decrease the rigorous bound T b of the black hole.

show abstract

“…The reflection coefficient is obtained by using the asymptotic matching technique, which relies on comparing the solution of the radial equation 8with its asymptotic approximations (10) and (11). Here we evaluate the radial equation both in the low-frequency regime and numerically to determine the reflection coefficients.…”

Section: Wave Equationsmentioning

confidence: 99%

“…Also, some of these black holes possess a bigger ergoregion, what could allow more energy extraction from them than from Kerr black holes. Indeed, it has been recently shown that a negative tidal charge increases the efficiency of energy extraction from the black hole via the Penrose process [11]. Still concerning about rotating black holes, the tidal charge has also important implications to astrophysics, as it may alters the radii size of ISCO [10,12,13] and of the shadow cast by the black hole [6,[14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Tidal-charge effects on the superradiance of rotating black holes

Oliveira

2020

Eur. Phys. J. C

View full text Add to dashboard Cite

The changes a (negative) tidal charge causes at the phenomenon of superradiance which occurs around rotating black holes are investigated. This is made by computing the amplification factors of massless scalar waves being scattered by the black hole. It is shown that the increase of the tidal-charge intensity leads to a considerable enhancement of energy extraction from near-extreme black holes. Such improvement results from the fact that extreme black holes with more negative tidal charges spin faster. Maximum amplification decreases with the increase of the tidal charge intensity if the angular momentum of the black hole per unit mass is fixed. The tidal charge may also change crucially the superradiance phenomenon of massless scalar waves causing maximum amplification to occur for $$m > 1$$ m > 1 differently from the case of Kerr black holes.

show abstract

Particle collisions in ergoregion of braneworld Kerr black hole

Cited by 32 publications

References 32 publications

Shadow cast by a rotating charged black hole in quintessential dark energy

Shadow cast by a rotating charged black hole in quintessential dark energy

Weak deflection angle of Kazakov-Solodukhin black hole in plasma medium using Gauss-Bonnet theorem and its greybody bonding

Tidal-charge effects on the superradiance of rotating black holes

Contact Info

Product

Resources

About