論文

査読有り
2003年7月

Computing gravitational waves from slightly nonspherical stellar collapse to a black hole: Odd-parity perturbation

PHYSICAL REVIEW D
  • T Harada
  • ,
  • H Iguchi
  • ,
  • M Shibata

68
2
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1103/PhysRevD.68.024002
出版者・発行元
AMER PHYSICAL SOC

Nonspherical stellar collapse to a black hole is one of the most promising gravitational wave sources for gravitational wave detectors. We numerically study gravitational waves from a slightly nonspherical stellar collapse to a black hole in linearized Einstein theory. We adopt a spherically collapsing star as the zeroth-order solution and gravitational waves are computed using perturbation theory on the spherical background. In this paper we focus on the perturbation of odd-parity modes. Using the polytropic equations of state with polytropic indices n(p)=1 and 3, we qualitatively study gravitational waves emitted during the collapse of neutron stars and supermassive stars to black holes from a marginally stable equilibrium configuration. Since the matter perturbation profiles can be chosen arbitrarily, we provide a few types for them. For n(p)=1, the gravitational waveforms are mainly characterized by a black hole quasinormal mode ringing, irrespective of perturbation profiles given initially. However, for n(p)=3, the waveforms depend strongly on the initial perturbation profiles. In other words, the gravitational waveforms strongly depend on the stellar configuration and, in turn, on the ad hoe choice of the functional form of the perturbation in the case of supermassive stars.


リンク情報
DOI
https://doi.org/10.1103/PhysRevD.68.024002
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000185229300035&DestApp=WOS_CPL
ID情報
  • DOI : 10.1103/PhysRevD.68.024002
  • ISSN : 2470-0010
  • eISSN : 2470-0029
  • Web of Science ID : WOS:000185229300035

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