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• W4295690862 abstract "We discuss the bulk viscosity of hot and dense $npemu$ matter arising from weak-interaction direct Urca processes. We consider two regimes of interest: (a) the neutrino-transparent regime with $Tleq T_{rm tr}$ ($T_{rm tr}simeq 5div 10$ MeV is the neutrino-trapping temperature); and (b) the neutrino-trapped regime with $Tgeq T_{rm tr}$. Nuclear matter is modeled in relativistic density functional approach with density-dependent parametrization DDME2. The maximum of the bulk viscosity is achieved at temperatures $T simeq 5div 6$ MeV in the neutrino-transparent regime, then it drops rapidly at higher temperatures where neutrino-trapping occurs. As an astrophysical application, we estimate the damping timescales of density oscillations by the bulk viscosity in neutron star mergers and find that, e.g., at the oscillation frequency $f=10$ kHz, the damping will be very efficient at temperatures $4leq Tleq 7$ MeV where the bulk viscosity might affect the evolution of the post-merger object." @default.
• W4295690862 created "2022-09-14" @default.
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• W4295690862 date "2022-09-06" @default.
• W4295690862 modified "2023-10-15" @default.
• W4295690862 title "Bulk Viscosity of Relativistic npeμ Matter in Neutron-Star Mergers" @default.
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• W4295690862 doi "https://doi.org/10.3390/particles5030029" @default.
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