Secular bar mode instabilities in rotating relativistic stars

Motoyuki Saijo, Eric Gourgoulhon

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

We investigate the viscosity driven instability in rotating relativistic stars by means of an iterative approach. We focus on polytropic rotating equilibrium stars and impose an m = 2 perturbation in the lapse. We vary both the stiffness of the equation of state and the compactness of the star to study these factors on the critical value T/W for the instability. For a rigidly rotating star, the criterion T/W, where T is the rotational kinetic energy and W the gravitational binding energy, mainly depends on the compactness of the star and takes values around 0.13 ~ 0.16, which slightly differ from that of Newtonian incompressible stars (~ 0.14). For differentially rotating stars, the critical value of T/W is found to span the range 0.17 - 0.25. The value is significantly larger than in the rigidly rotating case with the same compactness of the star.

Original languageEnglish
Title of host publicationProceedings of the 16th Workshop on General Relativity and Gravitation in Japan, JGRG 2006
Pages86-89
Number of pages4
Publication statusPublished - 2006
Externally publishedYes
Event16th Workshop on General Relativity and Gravitation in Japan, JGRG 2006 - Niigata
Duration: 2006 Nov 272006 Dec 1

Other

Other16th Workshop on General Relativity and Gravitation in Japan, JGRG 2006
CityNiigata
Period06/11/2706/12/1

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ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Saijo, M., & Gourgoulhon, E. (2006). Secular bar mode instabilities in rotating relativistic stars. In Proceedings of the 16th Workshop on General Relativity and Gravitation in Japan, JGRG 2006 (pp. 86-89)