Journal ArticleDOI
Nonlinear evolution of the r-modes in neutron stars.
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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
Citations
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Journal ArticleDOI
Influence of direct Urca on the r-mode spin down features of newborn neutron star pulsars
TL;DR: In this article, a study on the time duration, final frequency, and exit temperature of the r-mode instability in newborn neutron stars of normal fluid composition under the assumption that the rmode is the dominating spin-down mechanism is performed.
Journal ArticleDOI
The pre-supernova evolution of rotating massive stars
TL;DR: In this paper, the authors follow the evolution of typical massive stars, their structure and angular momentum distribution, from the zero-age main sequence until iron core collapse, and show that without the action of magnetic fields, the resulting angular momentum is sufficiently large to significantly affect the explosion mechanism and neutron star formation.
Journal ArticleDOI
The Critical Rotation of Strange Stars and Rapidly Rotating Pulsars
TL;DR: In this paper, the authors utilize the bulk viscosity of interacting strange quark matter to reevaluate the damping time scale and find that the r-mode instability window is narrowed due to the medium effect, and hence when a pulsar reaches the instability window it will only slow down by gravitational wave emission to a period of 1.78msec instead of 2.5msec given by early estimate.
Journal ArticleDOI
Long-term evolution and gravitational wave radiation of neutron stars with differential rotation induced by r-modes
TL;DR: In this article, the authors investigated the influence of the second-order r-mode induced differential rotation on the long-term evolutions of isolated NSs and NSs in low-mass X-ray binaries.
Journal ArticleDOI
Differential rotation of the unstable nonlinear r -modes
TL;DR: In this article, it was shown that the gravitational radiation-reaction force that drives the r-mode instability removes this gauge dependence, and the exponentially growing differential rotation of the unstable second-order rmode is unique.