Bulk Viscous Damping of Density Oscillations in Neutron Star Mergers

Alford, Mark; Harutyunyan, Arus; Sedrakian, Armen

doi:10.3390/particles3020034

Bulk Viscous Damping of Density Oscillations in Neutron Star Mergers

Journal Article · Fri Jun 19 00:00:00 EDT 2020 · Particles

DOI:https://doi.org/10.3390/particles3020034· OSTI ID:1830773

Alford, Mark ^[1]; Harutyunyan, Arus ^[2]; ^[3]

Washington Univ., St. Louis, MO (United States); Washington University in St. Louis
National Academy of Sciences, Byurakan (Armenia); Yerevan State University (Armenia)
Frankfurt Inst. for Advanced Studies (FIAS), Frankfurt (Germany); Univ. of Wroclaw (Poland)

In this paper, we discuss the damping of density oscillations in dense nuclear matter in the temperature range relevant to neutron star mergers. This damping is due to bulk viscosity arising from the weak interaction “Urca” processes of neutron decay and electron capture. The nuclear matter is modelled in the relativistic density functional approach. The bulk viscosity reaches a resonant maximum close to the neutrino trapping temperature, then drops rapidly as temperature rises into the range where neutrinos are trapped in neutron stars. We investigate the bulk viscous dissipation timescales in a post-merger object and identify regimes where these timescales are as short as the characteristic timescale ~10 ms, and, therefore, might affect the evolution of the post-merger object. Our analysis indicates that bulk viscous damping would be important at not too high temperatures of the order of a few MeV and densities up to a few times saturation density.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: European Cooperation in Science and Technology (COST); German Research Foundation (DFG); USDOE Office of Science (SC), Nuclear Physics (NP); Volkswagen Foundation

Grant/Contract Number:: FG02-05ER41375

OSTI ID:: 1830773

Journal Information:: Particles, Journal Name: Particles Journal Issue: 2 Vol. 3; ISSN 2571-712X

Publisher:: MDPICopyright Statement

Country of Publication:: United States

Language:: English

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