Formation of rapidly rotating dynamic black holes

Motoyuki Saijo

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

We investigate the formation of rapidly rotating dynamic black hole through gravitational collapse of rotating relativistic stars by means of 3+1 hydrodynamic simulations in general relativity. We succeed in producing a dynamic black hole of a = 0.98M through the collapse of differentially rotating supermassive stars, and find the following three issues. Firstly, the estimated ratio of the mass between the black hole and the surrounding disk from the equilibrium star is roughly the same as the results from numerical simulation. This suggests that the picture of axisymmetric collapse is adequate, in the absence of nonaxisymmetric instabilities, to illustrate the final state of the collapse. Secondly, quasi-periodic gravitational waves continue to be emitted after the quasinormal mode frequency has decayed. Finally, when the newly formed black hole is almost extreme Kerr, the amplitude of the quasi-periodic oscillation is enhanced during the late stages of the evolution. Geometrical features, shock waves, and instabilities of the fluid are suggested as a cause of this amplification behaviour. This alternative scenario for the collapse of differentially rotating supermassive stars might be observable by LISA.

Original languageEnglish
Title of host publicationProceedings of the 19th Workshop on General Relativity and Gravitation in Japan, JGRG 2009
Pages299-302
Number of pages4
Publication statusPublished - 2009
Externally publishedYes
Event19th Workshop on General Relativity and Gravitation in Japan, JGRG 2009 - Tokyo
Duration: 2009 Nov 302009 Dec 4

Other

Other19th Workshop on General Relativity and Gravitation in Japan, JGRG 2009
CityTokyo
Period09/11/3009/12/4

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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  • Cite this

    Saijo, M. (2009). Formation of rapidly rotating dynamic black holes. In Proceedings of the 19th Workshop on General Relativity and Gravitation in Japan, JGRG 2009 (pp. 299-302)