Letter to the editor. Gravitational waves from ultracompact stars: the optical geometry view of trapped modes


Abramowicz, M.A., Andersson, N., Bruni, M., Ghosh, P. and Sonego, S. (1997) Letter to the editor. Gravitational waves from ultracompact stars: the optical geometry view of trapped modes. Classical and Quantum Gravity, 14, (12), L189-L194.

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Description/Abstract

Ultracompact stars - if they exist - have a unique signature: a discrete spectrum of slowly damped gravitational-wave quasinormal modes. It is known that this feature is due to a potential well present for stars with R<3M. In this letter we show that the appearance of this well is essentially due to the non-Newtonian behaviour of the centrifugal potential: here we explain this behaviour adopting the optical geometry point of view. This insight leads us to an approximation, valid for highly compact stars, by which the real part of the spectrum is easily computed with good accuracy.

Item Type: Article
ISSNs: 0264-9381 (print)
Related URLs:
Subjects: Q Science > QB Astronomy
Q Science > QA Mathematics
Divisions: University Structure - Pre August 2011 > School of Mathematics > Applied Mathematics
ePrint ID: 29166
Date Deposited: 07 Feb 2007
Last Modified: 27 Mar 2014 18:17
URI: http://eprints.soton.ac.uk/id/eprint/29166

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