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w-mode instability of ultracompact relativistic stars

Kokkotas, K.D., Ruoff, J. and Andersson, N. (2004) w-mode instability of ultracompact relativistic stars. Physical Review D, 70, (4), 043003-[5pp]. (doi:10.1103/PhysRevD.70.043003)
http://eprints.soton.ac.uk/29456/

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Official URL: http://dx.doi.org/10.1103/Phys....70.043003

Abstract

In this article we show that the mainly spacetime w modes may become unstable in a rotating ultracompact (R<3M) relativistic star. We provide results for the axial modes of a rotating star in the slow rotation approximation, and demonstrate that an instability may become active in stars with an ergosphere. This suggests a close association with the so-called "ergosphere instability" discussed by other authors. The unstable modes are found to grow on a time scale of seconds to minutes. We discuss briefly whether the instability is likely to have any astrophysical relevance.

Item Type:Article
ISSN:1550-7998
Subjects:Q Science > QB Astronomy
Q Science > QA Mathematics
Q Science > QC Physics
School or Centre:School of Mathematics > Applied Mathematics
ID Code:29456
Deposited By:SOMM, Import
Deposited On:12 May 2006

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