Ultracompact rotating gravastars and the problem of matching with Kerr spacetime

Rutkowski, Mieszko; Rostworowski, Andrzej

doi:10.1103/physrevd.104.084041

Cited by 4 publications

(4 citation statements)

References 30 publications

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“…Various generalizations of the gravastar model have been under scrutiny during the last 20 years [17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33]. Gravitational wave signatures and non-radial oscillations of thin-shell gravastars were studied by [22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

“…Gravitational wave signatures and non-radial oscillations of thin-shell gravastars were studied by [22][23][24][25]. Some models of rotating gravastars have been proposed by a number of authors [26][27][28][29][30][31][32]. In this context, the ergoregion instability of rotating gravastars, which affects compact objects rotating rapidly, was investigated by [26,27].…”

Section: Introductionmentioning

confidence: 99%

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Slowly rotating ultra-compact Schwarzschild star in the gravastar limit

Beltracchi,

Posada

2024

Class. Quantum Grav.

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We reconsider the problem of a slowly rotating homogeneous star, or Schwarzschild star, when its compactness goes beyond the Buchdahl bound and approaches the gravastar limit R → 2M. We compute surface and integral properties of such conﬁguration by integrating the Hartle-Thorne structure equations for slowly rotating relativistic masses, at second order in angular velocity. In the gravastar limit, we show that the metric of a slowly rotating Schwarzschild star agrees with the Kerr metric, thus, within this approximation, it is not possible to tell a gravastar from a Kerr black hole by any observations from the spacetime exterior to the horizon.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Slowly rotating ultra-compact Schwarzschild star in the gravastar limit

Beltracchi,

Posada

2024

Class. Quantum Grav.

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“…Other works on the (un)charged gravastar models with their physical features have been studied in Refs. [12,[75][76][77][78][79][80][81][82][83][84][85][86]. Also, many gravastars have been studied in the framework of modified theories of gravity.…”

Section: Introductionmentioning

confidence: 99%

Stable three-dimensional (un)charged AdS gravastars in gravity’s rainbow

Barzegar

Bordbar

et al. 2023

Eur. Phys. J. C

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In this work, we study the three-dimensional AdS gravitational vacuum stars (gravastars) in the context of gravity’s rainbow theory. Then we extend it by adding the Maxwell electromagnetic field. We compute the physical features of gravastars, such as proper length, energy, entropy, and junction conditions. Our results show that the physical parameters for charged and uncharged states depend significantly on rainbow functions. Besides from charged state, they also depend on the electric field. Finally, we explore the stability of thin shell of three-dimensional (un)charged AdS gravastars in gravity’s rainbow. We show that the structure of thin shell of these gravastars may be stable and is independent of the type of matter.

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“…Other works on the (un)charged gravastar models with their physical features have been studied in Refs. [75][76][77][78][79][80][81][82][83][84][85][86][87]. Also, many gravastars have been studied in the framework of modified theories of gravity.…”

Section: Introductionmentioning

confidence: 99%