Braneworld Black Holes in Cosmology and Astrophysics

Majumdar, A. S.; Mukherjee, N.

doi:10.1142/s0218271805006948

Cited by 138 publications

(128 citation statements)

References 60 publications

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“…It needs to be emphasized that although several spherically symmetric and static brane black hole solutions with contributions from the bulk gravity have been found, none of these are obtained as exact solutions of the full fivedimensional bulk field equations [15]. The propagation of gravity into the bulk does not permit the treatment of the brane gravitational field equations as a closed system.…”

Section: Conclusion and Discussionmentioning

confidence: 99%

Energy absorption problem of a brane-world black hole

2007

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Section: Conclusion and Discussionmentioning

confidence: 99%

Energy absorption problem of a brane-world black hole

2007

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“…The difficulty in analysis of gravitational field equations and gravitational collapse on the branes is arising from the fact that the propagation of gravity into the bulk does not provide an opportunity to have brane equations for gravitational field in closed form [3].…”

Section: Maxwell Equations In a Spacetime Of Spherical Star In Thmentioning

confidence: 99%

“…In a coordinate system (ct, r, θ, φ), the space-time metric for a spherical relativistic star in the braneworld is [3]- [6] …”

Section: Maxwell Equations In a Spacetime Of Spherical Star In Thmentioning

confidence: 99%

“…Recently obtained solutions for relativistic stars on branes [3]- [7] have created an interest in the study of the influence and implications of the bulk tension on the various astrophysical processes, for example to the gravitational lensing [8,9,10] and to the motion of test particles [11]. To the best of our knowledge the effect of brane tension on magnetic field configuration in compact stars has not yet been studied.…”

Section: Introductionmentioning

confidence: 99%

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Magnetic fields of spherical compact stars in a braneworld

Ahmedov

Fattoyev

2008

Phys. Rev. D

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We study the dipolar magnetic field configuration in dependence on brane tension and present solutions of Maxwell equations in the internal and external background spacetime of a magnetized spherical star in a Randall-Sundrum II type braneworld. The star is modelled as sphere consisting of perfect highly magnetized fluid with infinite conductivity and frozen-in dipolar magnetic field. With respect to solutions for magnetic fields found in the Schwarzschild spacetime brane tension introduces enhancing corrections both to the interior and the exterior magnetic field. These corrections could be relevant for the magnetic fields of magnetized compact objects as pulsars and magnetars and may provide the observational evidence for the brane tension through the modification of formula for magneto-dipolar emission which gives amplification of electromagnetic energy loss up to few orders depending on the value of the brane tension.

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“…Certain aspects of the causal structure of on-brane and bulk black hole solutions have been studied by analyzing their time-like geodesics [119,120] though, again, comparatively little work has been done in this area. For a review of the black hole properties and of lensing effects in brane world models see [91]. Further work on lensing in brane worlds is presented in [121][122][123][124][125] and current observational constraints on the model parameters from classical, solar-system, tests are contained in [126,127].…”

Section: Introductionmentioning

confidence: 99%

Null fluid collapse in brane world models

Harkó

Lake

2014

Phys. Rev. D

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The brane world description of our universe entails a large extra dimension and a fundamental scale of gravity that may be lower than the Planck scale by several orders of magnitude. An interesting consequence of this scenario occurs in the nature of spherically-symmetric vacuum solutions to the brane gravitational field equations, which often have properties quite distinct from the standard black hole solutions of general relativity. In this paper, the spherically-symmetric collapse on the brane world of four types of null fluid, governed by the barotropic, polytropic, strange quark "bag" model and Hagedorn equations of state, is investigated. In each case, we solve the approximate gravitational field equations, obtained in the high density limit, determine the equation which governs the formation of apparent horizons and investigate the conditions for the formation of naked singularities. Though, naively, one would expect the increased effective energy density on the brane to favor the formation of black holes over naked singularities, we find that, for the types of fluid considered, this is not the case. However, the black hole solutions differ substantially from their general-relativistic counterparts and brane world corrections often play a role analogous to charge in general relativity. As an astrophysical application of this work, the possibility that energy emission from a Hagedorn fluid collapsing to form a naked singularity may be a source of GRBs in the brane world is also considered.

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Braneworld Black Holes in Cosmology and Astrophysics

Cited by 138 publications

References 60 publications

Energy absorption problem of a brane-world black hole

Energy absorption problem of a brane-world black hole

Magnetic fields of spherical compact stars in a braneworld

Null fluid collapse in brane world models

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