Gravastar: An alternative to black hole

Ray, Saibal; Sengupta, Rikpratik; Nimesh, Himanshu

doi:10.1142/s0218271820300049

Cited by 43 publications

(16 citation statements)

References 120 publications

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“…His work is then extended for f (R, T, R µν T µν ) [30] and f (R, G) [31] theories of gravity with spherical spacetimes. Recently, the origin as well as the existence of gravastars have been reviewed by Ray et al [32]. This paper extended the work of [33] and [34] for cylindrically symmetric metric in f (R, T ) theory.…”

Section: Introductionmentioning

confidence: 57%

Formation of Cylindrical Gravastars in Modified Gravity

Yousaf,

Bamba,

Bhatti

2021

Preprint

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In this paper, we analyze a few physical characteristics of gravastar with cylindrical geometry in f (R, T ) theory, where R is the Ricci scalar and T is the trace of energymomentum tensor. The gravastar is generally considered to be a substitute of a black hole with three different regions. In the present work, we examine the formulation of gravastar-like cylindrical structures in f (R, T ) theory. By using Darmois and Israel matching conditions, we formulate a mass function of a thin shell. We calculate the different physical characteristics of gravastar, in particular, entropy within the thin shell, proper length of the intermediate thin shell as well as energy of the shell.

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Section: Introductionmentioning

confidence: 57%

Formation of Cylindrical Gravastars in Modified Gravity

Yousaf,

Bamba,

Bhatti

2021

Preprint

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“…According to Cardoso et al [57,58], the ringdown signal of GW 150914 [56] has been detected by interferometric LIGO detectors are most probably generated by objects without event horizon which might be garvastar, though it yet to be confirmed [59] (in this context a detailed review on gravastar can be found in the ref. [60]).…”

Section: Boundary Conditionmentioning

confidence: 99%

Gravastar under the framework of Braneworld Gravity

Sengupta,

Ghosh,

Ray

et al. 2020

Preprint

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Gravastars have been considered as a serious alternative to black holes in the past couple of decades. Stable models of gravastar have been constructed in many of the alternate gravity models besides standard General Relativity (GR). The Randall-Sundrum (RS) braneworld model has been a popular alternative to GR, specially in the cosmological and astrophysical context. Here we consider a gravastar model in RS brane gravity. The mathematical solutions in different regions have been obtained along with calculation of matching conditions. Various important physical parameters for the shell have been calculated and plotted to see their variation with radial distance. We also calculate and plot the surface redshift to check the stability of the gravastar within the purview of RS brane gravity.

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“…Gravastars have also been explored in other modified gravity theories [78][79][80][81]. A comprehensive review on gravastar may be found in [82].…”

Section: Introductionmentioning

confidence: 99%

Gravastar under the framework of braneworld gravity II: effect of the Kuchowicz metric function

Ray¹,

Ghosh²,

Sengupta³

2022

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In recent years, a class of compact objects called gravastars have drawn immense interest as regular solutions to end state stellar collapse. Since the energy density involved in collapse process is expected to be high, it is a natural choice to study such compact objects in context of modified gravity theories which reduce to General Relativity (GR) in the low energy regime. We have already framed a model of gravastar in such a modified gravity framework involving extra dimensional Randall-Sundrum (RS) single brane gravity [Phys. Rev. D 102, 024037 (2020)] [1]. As a sequel in the present paper we substantially improve our previous model by choosing the Kuchowicz function as one of the metric potentials, which leads to many new interesting results and physical features from our analysis as discussed in this paper. Also, we provide essential additional stability checks on our gravastar model to investigate the possibility of any instability creeping in due to the higher dimensional framework. Our present improved gravastar model is found to clear all the stability checks successfully. Very interestingly, the static spherically symmetric matter distributions are found to accommodate both classes of solutions obeying and violating the modified energy conditions on the RS brane as we find in this work. We can conclude from our analysis that the Kuchowicz metric potential is very effective for describing regular solutions to compact objects at substantially high energies on the 3-brane.

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Gravastar: An alternative to black hole

Cited by 43 publications

References 120 publications

Formation of Cylindrical Gravastars in Modified Gravity

Formation of Cylindrical Gravastars in Modified Gravity

Gravastar under the framework of Braneworld Gravity

Gravastar under the framework of braneworld gravity II: effect of the Kuchowicz metric function

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