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Title: Damping of density oscillations in neutrino-transparent nuclear matter

Abstract

We calculate the bulk-viscous dissipation time for adiabatic density oscillations in nuclear matter at densities of one to seven times the nuclear saturation density and at temperatures ranging from 1 MeV, where corrections to previous low-temperature calculations become important, up to 10 MeV, where the assumption of neutrino transparency is no longer valid. Under these conditions, which are expected to occur in neutron star mergers, damping of density oscillations arises from β equilibration via weak interactions. Here, we find that for 1-kHz oscillations the shortest dissipation times are in the 5- to 20-ms range, depending on the equation of state, which means that bulk viscous damping could affect the dynamics of a neutron star merger. For higher frequencies, the dissipation time can be even shorter.

Authors:
ORCiD logo [1]; ORCiD logo [1]
  1. Washington Univ., St. Louis, MO (United States)
Publication Date:
Research Org.:
Washington Univ., St. Louis, MO (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
OSTI Identifier:
1566844
Grant/Contract Number:  
FG02-05ER41375
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review C
Additional Journal Information:
Journal Volume: 100; Journal Issue: 3; Related Information: https://journals.aps.org/prc/supplemental/10.1103/PhysRevC.100.035803; Journal ID: ISSN 2469-9985
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; neutron star; bulk viscosity; density oscillation; energy dissipation; urca process

Citation Formats

Alford, Mark G., and Harris, Steven P. Damping of density oscillations in neutrino-transparent nuclear matter. United States: N. p., 2019. Web. doi:10.1103/PhysRevC.100.035803.
Alford, Mark G., & Harris, Steven P. Damping of density oscillations in neutrino-transparent nuclear matter. United States. doi:10.1103/PhysRevC.100.035803.
Alford, Mark G., and Harris, Steven P. Fri . "Damping of density oscillations in neutrino-transparent nuclear matter". United States. doi:10.1103/PhysRevC.100.035803.
@article{osti_1566844,
title = {Damping of density oscillations in neutrino-transparent nuclear matter},
author = {Alford, Mark G. and Harris, Steven P.},
abstractNote = {We calculate the bulk-viscous dissipation time for adiabatic density oscillations in nuclear matter at densities of one to seven times the nuclear saturation density and at temperatures ranging from 1 MeV, where corrections to previous low-temperature calculations become important, up to 10 MeV, where the assumption of neutrino transparency is no longer valid. Under these conditions, which are expected to occur in neutron star mergers, damping of density oscillations arises from β equilibration via weak interactions. Here, we find that for 1-kHz oscillations the shortest dissipation times are in the 5- to 20-ms range, depending on the equation of state, which means that bulk viscous damping could affect the dynamics of a neutron star merger. For higher frequencies, the dissipation time can be even shorter.},
doi = {10.1103/PhysRevC.100.035803},
journal = {Physical Review C},
number = 3,
volume = 100,
place = {United States},
year = {2019},
month = {9}
}

Journal Article:
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