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w-mode instability of ultracompact relativistic stars

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.
1550-7998
043003-[5pp]
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.
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), 043003-[5pp]. (doi:10.1103/PhysRevD.70.043003).

Record type: Article

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

Identifiers

Local EPrints ID: 29456
URI: http://eprints.soton.ac.uk/id/eprint/29456
ISSN: 1550-7998
PURE UUID: 0046a348-062d-48f9-bfe8-fe9e98e78322
ORCID for N. Andersson: ORCID iD orcid.org/0000-0001-8550-3843

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Date deposited: 12 May 2006
Last modified: 28 Jun 2022 01:36

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Contributors

Author: K.D. Kokkotas
Author: J. Ruoff
Author: N. Andersson ORCID iD

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