Astronomy and Astrophysics – Astrophysics – High Energy Astrophysical Phenomena
Scientific paper
2009-12-16
Physics Letters B, Volume 683, 2010, pp. 255-258
Astronomy and Astrophysics
Astrophysics
High Energy Astrophysical Phenomena
11pages, 4 figures
Scientific paper
We study non-linear effects of radiative viscosity of $npe$ matter in neutron stars for both direct Urca process and modified Urca process, and find that non-linear effects will decrease the ratio of radiative viscosity to bulk viscosity from 1.5 to 0.5 (for direct Urca process) and 0.375 (for modified Urca process). Which means that for small oscillations of neutron star, the large fraction of oscillation energy is emitted as neutrinos; but for large enough ones, bulk viscous dissipation dominates.
Pi Chun-Mei
Yang Shu-Hua
Zheng Xiao-Ping
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