Bulk viscosity in superfluid neutron star cores

P. Haensel; K. P. Levenfish; D. G. Yakovlev

doi:10.1051/0004-6361:20011532

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Volume 381 / No 3 (JanuaryIII 2002)

A&A, 381 3 (2002) 1080-1089

Abstract

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Issue		A&A Volume 381, Number 3, JanuaryIII 2002


Page(s)		1080 - 1089
Section		Astronomical instrumentation
DOI		https://doi.org/10.1051/0004-6361:20011532
Published online		15 January 2002

A&A 381, 1080-1089 (2002)

III. Effects of $\mathsf{\Sigma^-}$ hyperons

P. Haensel¹, K. P. Levenfish² and D. G. Yakovlev²

¹ N. Copernicus Astronomical Center, Bartycka 18, 00-716 Warszawa, Poland
² Ioffe Physical Technical Institute, Politekhnicheskaya 26, 194021 St.-Petersburg, Russia e-mail: ksen,yak@astro.ioffe.rssi.ru

Corresponding author: P. Haensel, haensel@camk.edu.pl

Received: 16 October 2001
Accepted: 29 October 2001

Abstract

The bulk viscosity of neutron star cores containing hyperons is studied taking into account non-equilibrium weak process $\rm n+n \rightleftharpoons p+\Sigma^-$ . The rapid growth of the bulk viscosity within the neutron star core associated with switching on new reactions (modified Urca process, direct Urca process, hyperon reactions) is analyzed. The suppression of the bulk viscosity by superfluidity of baryons is considered and found out to be very important.

Key words: stars: neutron / dense matter

© ESO, 2002

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