"Ergoregion Instability of Ultracompact Astrophysical Objects" by Vitor Cardoso, Paolo Pani et al.
 

Abstract

Most of the properties of black holes can be mimicked by horizonless compact objects such as gravastars and boson stars. We show that these ultracompact objects develop a strong ergoregion instability when rapidly spinning. Instability time scales can be of the order of 0.1 seconds to 1 week for objects with mass M=1-106M⊙ and angular momentum J > 0.4M2. This provides a strong indication that ultracompact objects with large rotation are black holes. Explosive events due to ergoregion instability have a well-defined gravitational-wave signature. These events could be detected by next-generation gravitational-wave detectors such as Advanced LIGO or LISA.

Department(s)

Physics

Sponsor(s)

National Science Foundation (U.S.)
FCT (Fundação para a Ciência e Tecnologia)

Comments

This work was partially funded by Fundação para a Ciência e Tecnologia (FCT)- Portugal through Projects No. PTDC/FIS/64175/2006 and No. POCI/FP/81915/2007. M. C. gratefully acknowledges the support of the National Science Foundation through LIGO Research Support Grant No. NSF PHY-0757937.

International Standard Serial Number (ISSN)

1550-7998

Document Type

Article - Journal

Document Version

Final Version

File Type

text

Language(s)

English

Rights

© 2008 American Physical Society (APS), All rights reserved.

Publication Date

01 Jun 2008

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