w-mode instability of ultracompact relativistic stars
w-mode instability of ultracompact relativistic stars
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.
043003-[5pp]
Kokkotas, K.D.
7bdb71db-179a-4f68-9f5d-bd45dfea7dfc
Ruoff, J.
fc640d05-5630-4243-955a-fe40a8632651
Andersson, N.
2dd6d1ee-cefd-478a-b1ac-e6feedafe304
17 August 2004
Kokkotas, K.D.
7bdb71db-179a-4f68-9f5d-bd45dfea7dfc
Ruoff, J.
fc640d05-5630-4243-955a-fe40a8632651
Andersson, N.
2dd6d1ee-cefd-478a-b1ac-e6feedafe304
Kokkotas, K.D., Ruoff, J. and Andersson, N.
(2004)
w-mode instability of ultracompact relativistic stars.
Physical Review D, 70 (4), .
(doi:10.1103/PhysRevD.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.
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Published date: 17 August 2004
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Local EPrints ID: 29456
URI: http://eprints.soton.ac.uk/id/eprint/29456
ISSN: 1550-7998
PURE UUID: 0046a348-062d-48f9-bfe8-fe9e98e78322
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Date deposited: 12 May 2006
Last modified: 16 Mar 2024 03:02
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Author:
K.D. Kokkotas
Author:
J. Ruoff
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