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arXiv:astro-ph/0004183 (astro-ph)
[Submitted on 13 Apr 2000]

Title:Bulk viscosity in superfluid neutron star cores. I. Direct Urca processes in npeμmatter

Authors:P. Haensel (1), K.P. Levenfish (2), D.G. Yakovlev (2) ((1) N. Copernicus Astronomical Center, Warsaw, Poland (2) Ioffe Physical Technical Institute, St. Petersburg, Russia)
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Abstract: The bulk viscosity of the neutron star matter due to the direct Urca processes involving nucleons, electrons and muons is studied taking into account possible superfluidity of nucleons in the neutron star cores. The cases of singlet-state pairing or triplet-state pairing (without and with nodes of the superfluid gap at the Fermi surface) of nucleons are considered. It is shown that the superfluidity may strongly reduce the bulk viscosity. The practical expressions for the superfluid reduction factors are obtained. For illustration, the bulk viscosity is calculated for two models of dense matter composed of neutrons, protons,electrons and muons. The presence of muons affects the bulk viscosity due to the direct Urca reactions involving electrons and produces additional comparable contribution due to the direct Urca reactions involving muons. The results can be useful for studying damping of vibrations of neutron stars with superfluid cores.
Comments: 14 pages, 7 figures, latex, uses this http URL, to be published in Astronomy and Astrophysics
Subjects: Astrophysics (astro-ph)
Cite as: arXiv:astro-ph/0004183
  (or arXiv:astro-ph/0004183v1 for this version)
  https://doi.org/10.48550/arXiv.astro-ph/0004183
Journal reference: Astron.Astrophys.357:1157-1169,2000

Submission history

From: Pawel Haensel [view email]
[v1] Thu, 13 Apr 2000 10:55:19 UTC (324 KB)
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