Strangeness-changing rates and hyperonic bulk viscosity in neutron star mergers

Alford, Mark G.; Haber, Alexander

doi:10.1103/physrevc.103.045810

Strangeness-changing rates and hyperonic bulk viscosity in neutron star mergers

Journal Article · Wed Apr 28 00:00:00 EDT 2021 · Physical Review. C

DOI:https://doi.org/10.1103/physrevc.103.045810· OSTI ID:1830780

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Washington Univ., St. Louis, MO (United States); Washington University in St. Louis
Washington Univ., St. Louis, MO (United States)

In this paper we present a computation of the rates of strangeness-changing processes and the resultant bulk viscosity in matter at the densities and temperatures typical of neutron star mergers. To deal with the high temperature in this environment we go beyond the Fermi surface approximation in our rate calculations and numerically evaluate the full phase space integral. Here, we include processes where quarks move between baryons via meson exchange: these have generally been omitted in previous analyses but provide the dominant contribution to the rates of strangeness-changing processes and the bulk viscosity. The calculation of these rates is an essential step towards any calculation of dissipation mechanisms in hyperonic matter in mergers. As one application, we calculate the dissipation times for density oscillations at the frequencies seen in merger simulations. We find that hyperon bulk viscosity for temperatures in the MeV regime can probably be neglected in this context, but becomes highly relevant for keV-range temperatures.

View Accepted Manuscript (DOE)

Research Organization:: Washington Univ., St. Louis, MO (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: FG02-05ER41375

OSTI ID:: 1830780

Journal Information:: Physical Review. C, Journal Name: Physical Review. C Journal Issue: 4 Vol. 103; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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