Bulk viscosity in neutron stars from hyperons

E. N. E. van Dalen and A. E. L. Dieperink

Phys. Rev. C 69, 025802 – Published 27 February 2004

Abstract

The contribution from hyperons to the bulk viscosity of neutron star matter is calculated. Compared to previous works we use for the weak interaction the one-pion exchange model rather than a current-current interaction, and include the neutral current $n n \leftrightarrow n Λ$ process. Also the sensitivity to details of the equation of state is examined. Compared to previous works we find that the contribution from hyperons to the bulk viscosity is about two orders of magnitude smaller.

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Received 9 September 2003

DOI:https://doi.org/10.1103/PhysRevC.69.025802

Authors & Affiliations

E. N. E. van Dalen^* and A. E. L. Dieperink^†

Theory Group, Kernfysisch Versneller Instituut, University of Groningen, Zernikelaan 25, NL-9747 AA Groningen, The Netherlands

^*Present address: Institut für Theoretische Physik, Universität Tübingen, Auf der Morgenstelle 14, D-72076 Tübingen, Germany. Electronic addresses: vandalen@kvi.nl; eric.van-dalen@uni-tuebingen.de.
^†Electronic address: dieperink@kvi.nl

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Issue

Vol. 69, Iss. 2 — February 2004

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Physical Review C

covering nuclear physics