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Gravitational waves from instabilities in relativistic stars

REVIEW ARTICLE

Nils Andersson

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TOPICAL REVIEW

This paper provides an overview of stellar instabilities as sources of gravitational waves. The aim is to put recent work on secular and dynamical instabilities in compact stars in context, and to summarize the current thinking about the detectability of gravitational waves from various scenarios. As a new generation of kilometre length interferometric detectors is now coming online this is a highly topical theme. The review is motivated by two key questions for future gravitational-wave astronomy: are the gravitational waves from various instabilities detectable? If so, what can these gravitational-wave signals teach us about neutron star physics? Even though we may not have clear answers to these questions, recent studies of the dynamical bar-mode instability and the secular r-mode instability have provided new insights into many of the difficult issues involved in modelling unstable stars as gravitational-wave sources.


PACS

04.40.Dg Relativistic stars: structure, stability, and oscillations

04.30.Db Wave generation and sources

97.10.Sj Pulsations, oscillations, and stellar seismology

97.60.Jd Neutron stars

MSC

85A05 Galactic and stellar dynamics

83C35 Gravitational waves

Subjects

Gravitation and cosmology

Astrophysics and astroparticles

Dates

Issue 7 (7 April 2003)

Received 7 May 2002, in final form 5 February 2003

Published 12 March 2003



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