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  How to tell a gravastar from a black hole

Chirenti, C., & Rezzolla, L. (2007). How to tell a gravastar from a black hole. Classical and Quantum Gravity, 24(16), 4191-4206. doi:10.1088/0264-9381/24/16/013.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-47F3-6 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-47F4-4
Genre: Journal Article

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cqg7_16_013.pdf (Publisher version), 319KB
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 Creators:
Chirenti, Cecilia, Author
Rezzolla, Luciano1, Author              
Affiliations:
1Astrophysical Relativity, AEI-Golm, MPI for Gravitational Physics, Max Planck Society, ou_24013              

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 Abstract: Gravastars have been recently proposed as potential alternatives to explain the astrophysical phenomenology traditionally associated to black holes, raising the question of whether the two objects can be distinguished at all. Leaving aside the debate about the processes that would lead to the formation of a gravastar and the astronomical evidence in their support, we here address two basic questions: Is a gravastar stable against generic perturbations? If stable, can an observer distinguish it from a black hole of the same mass? To answer these questions we construct a general class of gravastars and determine the conditions they must satisfy in order to exist as equilibrium solutions of the Einstein equations. For such models we perform a systematic stability analysis against axial-perturbations, computing the real and imaginary parts of the eigenfrequencies. Overall, we find that gravastars are stable to axial perturbations, but also that their quasi-normal modes differ from those of a black hole of the same mass and thus can be used to discern, beyond dispute, a gravastar from a black hole.

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 Dates: 2007-08-21
 Publication Status: Published in print
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 Identifiers: eDoc: 318094
DOI: 10.1088/0264-9381/24/16/013
Other: arXiv:0706.1513
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Title: Classical and Quantum Gravity
Source Genre: Journal
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Pages: - Volume / Issue: 24 (16) Sequence Number: - Start / End Page: 4191 - 4206 Identifier: -