Journal ArticleDOI
Nonlinear evolution of the r-modes in neutron stars.
TLDR
The evolution of a neutron-star r-mode driven unstable by gravitational radiation is studied here using numerical solutions of the full nonlinear fluid equations to study the nonlinear evolution of the mode.Abstract:
The evolution of a neutron-star $r$-mode driven unstable by gravitational radiation is studied here using numerical solutions of the full nonlinear fluid equations. The dimensionless amplitude of the mode grows to order unity before strong shocks develop which quickly damp the mode. In this simulation the star loses about $40%$ of its initial angular momentum and $50%$ of its rotational kinetic energy before the mode is damped. The nonlinear evolution causes the fluid to develop strong differential rotation which is concentrated near the surface and poles of the star.read more
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Journal ArticleDOI
Differential rotation and r-modes in magnetized neutron stars
TL;DR: In this paper, the authors presented a non-drifting solution of the second order drift associated with r-modes, which does not lead to magnetic field enhancement and suppression of r-mode instability in magnetized neutron stars.
Journal ArticleDOI
Evolution of newborn rapidly rotating magnetars: Effects of R-mode and fall-back accretion
J. S. Wang,Zi-Gao Dai +1 more
TL;DR: In this article, the authors investigated the effects of the r-mode instability on a newborn rapidly-rotating magnetar with fall-back accretion and found that the magnetar's spin and r -mode evolution are influenced by accretion.
Journal ArticleDOI
Supernovae, Gamma-Ray Bursts and Stellar Rotation
S. E. Woosley,Alexander Heger +1 more
TL;DR: In this article, the possibility of slowing young neutron stars in ordinary supernovae by a combination of neutrino-powered winds and the propeller mechanism is discussed, and the fall back of slowly moving ejecta during the first day of the supernova may be critical.
Journal ArticleDOI
Large amplitude behavior of the bulk viscosity of dense matter
TL;DR: In this paper, the authors study the bulk viscosity of dense matter, taking into account non-linear effects which arise in the large amplitude "supra-thermal" region where the deviation of the chemical potentials from chemical equilibrium fulfills T.
Journal ArticleDOI
Non-linear r modes in neutron stars: a hydrodynamical limitation on r-mode amplitudes
TL;DR: In this paper, the particular coupling mechanism responsible for the catastrophic decay of large-amplitude r modes was identified, and the fluid modes involved were identified and the coupling strength of the particular three-mode interaction causing the decay was analyzed.