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  Ergoregion instability in rotating gravastars

Chirenti, C. B. M. H., & Rezzolla, L. (2008). Ergoregion instability in rotating gravastars. Physical Review D, 78(8): 084011. doi:10.1103/PhysRevD.78.084011.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-136E-D Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-1370-5
Genre: Journal Article

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PRD78-084011.pdf (Publisher version), 380KB
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Chirenti, Cecilia B. M. H.1, Author
Rezzolla, Luciano1, 2, 3, Author
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1Astrophysical Relativity, AEI-Golm, MPI for Gravitational Physics, Max Planck Society, Golm, DE, ou_24013              
2External Organizations, Department of Physics, Louisiana State University, Baton Rouge, Louisiana 70803, USA , ou_persistent22              
3External Organizations, INFN, Department of Physics, University of Trieste, Trieste, Italy, ou_persistent22              

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 Abstract: 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/M2~1, 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 ultracompact astrophysical objects rotating with J/M2<~1 are to be considered necessarily black holes.

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 Dates: 2008-10-08
 Publication Status: Published online
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Title: Physical Review D
Source Genre: Journal
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Pages: - Volume / Issue: 78 (8) Sequence Number: 084011 Start / End Page: - Identifier: ISSN: 1089-4918