Non-linear viscous saturation of r-modes

Details Non-linear viscous saturation of r-modes Non-linear viscous saturation of r-modes

2010-12-21

arxiv.org/abs/1012.4834v2

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

3 pages, contribution to the proceedings of the conference "Quark Confinement and the Hadron Spectrum IX", August 30 - Septemb

Scientific paper

Pulsar spin frequencies and their time evolution are an important source of information on compact stars and their internal composition. Oscillations of the star can reduce the rotational energy via the emission of gravitational waves. In particular unstable oscillation modes, like r-modes, are relevant since their amplitude becomes large and can lead to a fast spin-down of young stars if they are saturated by a non-linear saturation mechanism. We present a novel mechanism based on the pronounced large-amplitude enhancement of the bulk viscosity of dense matter. We show that the enhanced damping due to non-linear bulk viscosity can saturate r-modes of neutron stars at amplitudes appropriate for an efficient spin-down.

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