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Event: 'Ergoregion Instability Rules Out BH Mimickers, By Paolo Pani (Cagliari And CENTRA)'

Seminars
CENTRA Seminars
Date: Thursday, October 09, 2008 At 02:30 PM
Duration: 1 Hour
Contact Info:
Vitor Cardoso
Email: This e-mail address is being protected from spambots. You need JavaScript enabled to view it
URL:

Most of the properties of black holes can be mimicked by horizonless compact objects such as
gravastars, boson stars, wormholes and superspinars. These "black hole mimickers"
develop a strong ergoregion instability when rapidly spinning. Instability timescales can be of the
order of 0.1 seconds to 1 week for objects with mass M = 1-10^6 M_{sun} and angular momentum
J > 0.4M^2 . This provides a strong indication that very compact objects with large rotation are
black holes.


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