Abstract

Ultra-compact, horizonless objects such as gravastars, boson stars, wormholes and superspinars can mimick most of the properties of black holes. Here we show that these "black hole mimickers" will most likely develop a strong ergoregion instability when rapidly spinning. Instability timescales range between ∼ 10-5s and ∼ weeks depending on the object, its mass and its angular momentum. For a wide range of parameters the instability is truly effective. This provides a strong indication that astrophysical ultra-compact objects with large rotation are black holes.

Meeting Name

Black Holes in General Relativity and String Theory (2008: Aug. 24-30, Veli Lošinj, Croatia)

Department(s)

Physics

Sponsor(s)

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

Comments

This work is supported by Fundação para a Ciência e Tecnologia (FCT) - Portugal through project PTDC/FIS/64175/2006 and by the National Science Foundation through LIGO Research Support grant NSF PHY-0757937.

Keywords and Phrases

Black holes; Large rotation; Most likely; Time-scales; Relativity; Stability; Stars; String theory; Gravitation

International Standard Serial Number (ISSN)

1824-8039

Document Type

Article - Conference proceedings

Document Version

Final Version

File Type

text

Language(s)

English

Rights

© 2008 Sissa Medialab, All rights reserved.

Creative Commons Licensing

Creative Commons License
This work is licensed under a Creative Commons Attribution-Share Alike 4.0 License.

Included in

Physics Commons

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