Damping of density oscillations in neutrino-transparent nuclear matter - INSPIRE

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Damping of density oscillations in neutrino-transparent nuclear matter

Jul 8, 2019

13 pages

Published in:

Phys.Rev.C 100 (2019) 3, 035803

Published: Sep 28, 2019

e-Print:

1907.03795 [nucl-th]

DOI:

10.1103/PhysRevC.100.035803

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Abstract: (APS)

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previous low-temperature calculations become important, up to 10 MeV, where the assumption of neutrino transparency is no longer valid.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. 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.

Note:

13 pages v2: Matches journal version

Nuclear Astrophysics
density: oscillation
saturation: density
frequency: high
dissipation
nuclear matter
neutron star
equation of state
weak interaction
transparency

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