Emergence of Microphysical Bulk Viscosity in Binary Neutron Star Postmerger Dynamics
Emergence of Microphysical Bulk Viscosity in Binary Neutron Star Postmerger Dynamics
Abstract In nuclear matter in isolated neutron stars, the flavor content (e.g., proton fraction) is subject to weak interactions, establishing flavor ( β -)equilibrium. However, there can be deviations from this equilibrium during the merger of two neutron stars. We study the resulting out-of-equilibrium dynamics during the collision by incorporating …