Irreversible heating during collapse of the supernova core

Details Irreversible heating during collapse of the supernova core Irreversible heating during collapse of the supernova core

Feb 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981nupha.352..492s&link_type=abstract

Nuclear Physics A, Volume 352, Issue 3, p. 492-504.

Physics

Nuclear Physics

1

Scientific paper

We have investigated the entropy generation in the core of a supernova collapse in the period after neutrino trapping. The effects of time lag in attaining beta equilibrium have been treated carefully, through solution of the appropriate Boltzmann equation for the neutrino distribution. The actual dissipation ranges from being negligible to being of marginal importance, depending on the assumptions made as to the electron capture rate in nuclei. This is in qualitative agreement with the estimates of Bethe et al. At the low temperatures anticipated in the initial infall the microscopic dissipation rate is not described by a bulk viscosity parameter. However, at somewhat higher temperatures, as may be encountered later in the development of the young neutron stars, the dissipation should be of this form. Results for bulk viscosity are given for a medium consisting of trapped neutrinos, nuclei and electrons.

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