Rotating Ayón-Beato-García black hole as a particle accelerator

Ghosh, Sushant G.; Sheoran, Pankaj; Amir, M. Jamil

doi:10.1103/physrevd.90.103006

Cited by 44 publications

(32 citation statements)

References 39 publications

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“…This gave an opening to explore ultrahigh energy collisions and astrophysical phenomena, such as gamma ray bursts and active galactic nuclei. Hence, the BSW mechanism received significant attention in the study of the collision of two particles near a rotating black hole [20,27,[31][32][33][34][35][36][37] (see also [38] for a review). In this section, we want to study the properties of E CM as r tends to the event horizon r + H in the case of a rotating Bardeen regular black hole.…”

Section: Near Horizon Collision In the Rotating Bardeen Regular Blackmentioning

confidence: 99%

Horizon structure of rotating Bardeen black hole and particle acceleration

Ghosh

Amir

2015

Eur. Phys. J. C

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We investigate the horizon structure and ergosphere in a rotating Bardeen regular black hole, which has an additional parameter (g) due to the magnetic charge, apart from the mass (M) and the rotation parameter (a). Interestingly, for each value of the parameter g, there exists a critical rotation parameter (a = a E ), which corresponds to an extremal black hole with degenerate horizons, while for a < a E it describes a non-extremal black hole with two horizons, and no black hole for a > a E . We find that the extremal value a E is also influenced by the parameter g, and so is the ergosphere. While the value of a E remarkably decreases when compared with the Kerr black hole, the ergosphere becomes thicker with the increase in g. We also study the collision of two equal mass particles near the horizon of this black hole, and explicitly show the effect of the parameter g. The center-of-mass energy (E CM ) not only depend on the rotation parameter a, but also on the parameter g. It is demonstrated that the E CM could be arbitrarily high in the extremal cases when one of the colliding particles has a critical angular momentum, thereby suggesting that the rotating Bardeen regular black hole can act as a particle accelerator.

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Section: Near Horizon Collision In the Rotating Bardeen Regular Blackmentioning

confidence: 99%

Horizon structure of rotating Bardeen black hole and particle acceleration

Ghosh

Amir

2015

Eur. Phys. J. C

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“…This prompted a generalization of these regular solutions to the axially symmetric case or to the Kerr-like solution [25][26][27][28][29], via the Newman-Janis algorithm [30] and by other, similar techniques [31][32][33]. It is also demonstrated that these rotating regular solutions can act as particle accelerator [34,35]. The algorithm also allowed one to generate a noncommutative inspired rotating black hole with a regular de Sitter toroidal region [36].…”

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A nonsingular rotating black hole

2015

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The spacetime singularities in classical general relativity are inevitable, as predicated by the celebrated singularity theorems. However, it is a general belief that singularities do not exist in Nature and that they are the limitations of the general relativity. In the absence of a welldefined quantum gravity, models of regular black holes have been studied. We employ a probability distribution inspired mass function m(r ) to replace the Kerr black hole mass M to represent a nonsingular rotating black hole that is identified asymptotically (r k, k > 0 constant) exactly as the KerrNewman black hole, and as the Kerr black hole when k = 0. The radiating counterpart renders a nonsingular generalization of Carmeli's spacetime as well as Vaidya's spacetime, in the appropriate limits. The exponential correction factor changing the geometry of the classical black hole to remove the curvature singularity can also be motivated by quantum arguments. The regular rotating spacetime can also be understood as a black hole of general relativity coupled to nonlinear electrodynamics.The celebrated theorems of Penrose and Hawking [1] state that under some circumstances singularities are inevitable in general relativity. For the Kerr solution these singularities have the shape of a ring, this case is timelike. The Kerr metric [2] is undoubtedly the most remarkable exact solution in the Einstein theory of general relativity, which represents the prototypical black hole that can arise from gravitational collapse, which contains an event horizon [3]. Thanks to the no-hair theorem, the vacuum region outside a stationary black hole has a Kerr geometry. It is believed that spacetime singularities do not exist in Nature; they are a creation of general relativity. It turns out that we need to ask to what extent a singularity in general relativity could be adequately explained by some other theory, say, quantum gravity. However, we are yet afar from a specific theory of quantum gravity. So a suitable course of action is to understand the inside of a black hole and resolve its singularity by carrying out research of a

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“…Further, these regular black holes are very important as astrophysical black holes, like Cygnus X-1, although suppose to be like the Kerr black hole [32,33], but the actual nature of astrophysical black hole still need to be tested [32,33], and they may deviate from the Kerr black hole. More recently, the BSW mechanism when applied to an extremal regular black holes [34,35], also lead to divergence of the E CM . The main purpose of this paper is to study the collision of two particles with equal rest masses in the background of the rotating Hayward's regular black hole and to see what effect the deviation parameter g makes on the E CM .…”

Section: Jhep07(2015)015mentioning

confidence: 99%

Rotating Hayward’s regular black hole as particle accelerator

Amir

Ghosh

2015

J. High Energ. Phys.

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Recently, Bañados, Silk and West (BSW) demonstrated that the extremal Kerr black hole can act as a particle accelerator with arbitrarily high center-of-mass energy (E CM ) when the collision takes place near the horizon. The rotating Hayward's regular black hole, apart from Mass (M ) and angular momentum (a), has a new parameter g (g > 0 is a constant) that provides a deviation from the Kerr black hole. We demonstrate that for each g, with M = 1, there exist critical a E and r E H , which corresponds to a regular extremal black hole with degenerate horizons, and a E decreases whereas r E H increases with increase in g. While a < a E describe a regular non-extremal black hole with outer and inner horizons. We apply the BSW process to the rotating Hayward's regular black hole, for different g, and demonstrate numerically that the E CM diverges in the vicinity of the horizon for the extremal cases thereby suggesting that a rotating regular black hole can also act as a particle accelerator and thus in turn provide a suitable framework for Plank-scale physics. For a non-extremal case, there always exist a finite upper bound for the E CM , which increases with the deviation parameter g.

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Rotating Ayón-Beato-García black hole as a particle accelerator

Cited by 44 publications

References 39 publications

Horizon structure of rotating Bardeen black hole and particle acceleration

Horizon structure of rotating Bardeen black hole and particle acceleration

A nonsingular rotating black hole

Rotating Hayward’s regular black hole as particle accelerator

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