Viscous Dissipation and Heat Conduction in Binary Neutron-Star Mergers

Alford, Mark G.; Bovard, Luke; Hanauske, Matthias; Rezzolla, Luciano; Schwenzer, Kai

doi:10.1103/physrevlett.120.041101

Viscous Dissipation and Heat Conduction in Binary Neutron-Star Mergers

Journal Article · Tue Jan 23 00:00:00 EST 2018 · Physical Review Letters

DOI:https://doi.org/10.1103/physrevlett.120.041101· OSTI ID:1541273

Alford, Mark G. ^[1]; Bovard, Luke ^[2]; Hanauske, Matthias ^[3]; Rezzolla, Luciano ^[3]; Schwenzer, Kai ^[4]

Washington Univ., St. Louis, MO (United States). Physics Dept.; DOE/OSTI
Inst. für Theoretische Physik, Frankfurt (Germany)
Inst. für Theoretische Physik, Frankfurt (Germany); Frankfurt Inst. for Advanced Studies (Germany)
Eberhard Karls Univ. of Tübingen (Germany). Theoretical Astrophysics (IAAT); Istanbul Univ. (Turkey). Dept. of Astronomy and Space Sciences

Inferring the properties of dense matter is one of the most exciting prospects from the measurement of gravitational waves from neutron star mergers. However, it requires reliable numerical simulations that incorporate viscous dissipation and energy transport as these can play a significant role in the survival time of the post-merger object. We calculate time scales for typical forms of dissipation and find that thermal transport and shear viscosity will not be important unless neutrino trapping occurs, which requires temperatures above 10 MeV and gradients over length scales of 0.1 km or less. On the other hand, if direct-Urca processes remain suppressed, leaving modified-Urca processes to establish flavor equilibrium, then bulk viscous dissipation could provide significant damping to density oscillations right after merger. When comparing with data from state-of-the-art merger simulations, we find that the bulk viscosity takes values close to its resonant maximum in a typical merger, motivating a more careful assessment of the role of bulk viscous dissipation in the gravitational-wave signal from merging neutron stars.

View Accepted Manuscript (DOE)

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

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

Grant/Contract Number:: FG02-05ER41375

OSTI ID:: 1541273

Alternate ID(s):: OSTI ID: 1417772

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 4 Vol. 120; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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