Instabilities in rotating relativistic stars driven by viscosity - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Astrophysics and Space Science Année : 2007

Instabilities in rotating relativistic stars driven by viscosity

Résumé

We investigate the instability driven by viscosity 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. Finally we discuss the possibility of detecting gravitational waves from viscosity-driven instabilities using ground-based interferometers.

Dates et versions

hal-03743045 , version 1 (02-08-2022)

Identifiants

Citer

Motoyuki Saijo, Éric Gourgoulhon. Instabilities in rotating relativistic stars driven by viscosity. Astrophysics and Space Science, 2007, 308, pp.481-485. ⟨10.1007/s10509-007-9357-3⟩. ⟨hal-03743045⟩
3 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More