Neutrino Trapping and Out-of-Equilibrium Effects in Binary Neutron-Star Merger Remnants

Journal Article · 20 May 2024 · Physical Review Letters

DOI: https://doi.org/10.1103/physrevlett.132.211001 · OSTI ID:2356796

Espino, Pedro Luis ^[1]; Hammond, Peter ^[2]; Radice, David  ^[2]; Bernuzzi, Sebastiano  ^[3]; Gamba, Rossella ^[3]; Zappa, Francesco ^[3]; Micchi, Luís Longo  ^[3]; Perego, Albino ^[4]

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1. Pennsylvania State University, University Park, PA (United States); University of California, Berkeley, CA (United States); The Pennsylvania State University
2. Pennsylvania State University, University Park, PA (United States)
3. Friedrich-Schiller-Universität Jena (Germany)
4. Università di Trento (Italy); INFN-TIFPA, Trento (Italy)

We study out-of-thermodynamic-equilibrium effects in neutron-star mergers with 3D general-relativistic neutrino-radiation large-eddy simulations. During mergers, the cores of the neutron stars remain cold (T ~ a few MeV) and out of thermodynamic equilibrium with trapped neutrinos originating from the hot collisional interface between the stars. However, within ~2 to 3 ms matter and neutrinos reach equilibrium everywhere in the remnant massive neutron star. Furthermore, our results show that dissipative effects, such as bulk viscosity, if present, are only active for a short window of time after the merger.

• Research Organization: Pennsylvania State University, University Park, PA (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Nuclear Physics (NP); National Science Foundation (NSF); Deutsche Forschungsgemeinschaft (DFG); EU Horizon
• Grant/Contract Number: SC0021177; SC0024388; AC02-05CH11231
• OSTI ID: 2356796
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 21 Vol. 132; ISSN 0031-9007
• Publisher: American Physical Society (APS)Copyright Statement
• Country of Publication: United States
• Language: English