Born–Infeld phantom gravastars

Bilić, Neven; Tupper, Gary B.; Viollier, Raoul D.

doi:10.1088/1475-7516/2006/02/013

Cited by 128 publications

(101 citation statements)

References 68 publications

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“…A particular class of wormholes consists of those constructed by cutting and pasting two manifolds to obtain a new one with a joining shell at the throat [2]. In recent years shells around vacuum (bubbles), around black holes and stars, and supporting traversable wormholes, have received considerable attention [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25]; spherically symmetric shells have been studied in detail in four and also in more spacetime dimensions [26][27][28][29][30][31]. We have recently analyzed four-dimensional spherical shells for Einstein gravity coupled to Born-Infeld electrodynamics in relation with thin-shell wormholes [32,33] and shells around vacuum or around black holes [34].…”

Section: Introductionmentioning

confidence: 99%

General formalism for the stability of thin-shell wormholes in $$2+1$$ 2 + 1 dimensions

2014

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In this article we theoretically construct circular thin-shell wormholes in a 2 + 1-dimensional spacetime. The construction is symmetric with respect to the throat. We present a general formalism for the study of the mechanical stability under perturbations preserving the circular symmetry of the configurations, adopting a linearized equation of state for the exotic matter at the throat. We apply the formalism to several examples.

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Section: Introductionmentioning

confidence: 99%

General formalism for the stability of thin-shell wormholes in $$2+1$$ 2 + 1 dimensions

2014

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“…Several possibilities for the interior solution have been considered in refs. [5], [6] and [7], among others. More recently, a solution for electrically charged gravastar configurations was proposed in ref.…”

Section: Introductionmentioning

confidence: 99%

Ergoregion instability in rotating gravastars

2008

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The ergoregion instability is known to affect very compact objects that rotate very rapidly and do not possess a horizon. We present here a detailed analysis on the relevance of the ergoregion instability for the viability of gravastars. Expanding on some recent results, we show that not all rotating gravastars are unstable. Rather, stable models can be constructed also with J/M 2 ∼ 1, where J and M are the angular momentum and mass of the gravastar, respectively. The genesis of gravastars is still highly speculative and fundamentally unclear if not dubious. Yet, their existence cannot be ruled out by invoking the ergoregion instability. For the same reason, not all ultra-compact astrophysical objects rotating with J/M 2 1 are to be considered necessarily black holes.

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“…Since this proposal, different versions of the original gravastar model have appeared with all variety of ingredients. For example, it has been shown how a gravastar structure can form from a Born-Infeld scalar field such as that predicted by low energy string theory [7] or supported from non-linear electrodynamics [8]. In the multi-layer structure of the M-M model with de Sitter core and asymptotical Schwarzschild outside region, additional features have been added.…”

Section: Introductionmentioning

confidence: 99%