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

Year: 2024

Type: article

Abstract: 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. Our results show that dissipative effects, such as bulk viscosity, if present, are only active for a short window of time after the merger.

Source: Physical Review Letters

DOI: 10.1103/physrevlett.132.211001

Authors: Pedro Luis Espino, Peter Hammond, David Radice, Sebastiano Bernuzzi, Rossella Gamba, Francesco Zappa, Luís Felipe Longo Micchi, Albino Perego

Institutions: Pennsylvania State University, University of California, Berkeley, Friedrich Schiller University Jena, University of Trento, Istituto Nazionale di Fisica Nucleare, Trento Institute for Fundamental Physics And Applications

Language: English

Topic: Pulsars and Gravitational Waves Research

Subfield: Astronomy and Astrophysics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

Funders: National Science Foundation, U.S. Department of Energy, National Energy Research Scientific Computing Center, Deutsche Forschungsgemeinschaft, Gauss Centre for Supercomputing, Office of Science, Horizon 2020 Framework Programme, Nuclear Physics, H2020 European Research Council

OpenAlex ID: W4398142905