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Bulk viscosity in hyperonic star and r-mode instability

Publication Type : Conference Paper

Publisher : Phys. Rev

Source : Phys. Rev. C 82, 025803 (2010). Impact Factor: 3.199, Quartile: Q1

Url : https://arxiv.org/abs/1002.4253

Campus : Coimbatore

School : School of Engineering

Year : 2010

Abstract : We consider a rotating neutron star with the presence of hyperons in its core, using an equation of state in an effective chiral model within the relativistic mean field approximation. We calculate the hyperonic bulk viscosity coefficient due to nonleptonic weak interactions. By estimating the damping timescales of the dissipative processes, we investigate its role in the suppression of gravitationally driven instabilities in the r-mode. We observe that r-mode instability remains very much significant for hyperon core temperature of around 108K, resulting in a comparatively larger instability window. We find that such instability can reduce the angular velocity of the rapidly rotating star considerably upto ∼0.04ΩK, with ΩK as the Keplerian angular velocity.

Cite this Research Publication : Bulk viscosity in hyperonic star and r-mode instability, T.K. Jha, H. Mishra and V. Sreekanth, Phys. Rev. C 82, 025803 (2010). Impact Factor: 3.199, Quartile: Q1

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