EoS for hot neutron stars

Abstract

We review the equation of state (EoS) models covering a large range of temperatures, baryon number densities and electron fractions presently available on the \textsc{CompOSE} database. These models are intended to be directly usable within numerical simulations of core-collapse supernovae, binary neutron star mergers and proto-neutron star evolution. We discuss their compliance with existing constraints from astrophysical observations and nuclear data. For a selection of purely nucleonic models in reasonable agreement with the above constraints, after discussing the properties of cold matter, we review thermal properties for thermodynamic conditions relevant for core-collapse supernovae and binary neutron star mergers. We find that the latter are strongly influenced by the density dependence of the nucleon effective mass. The selected bunch of models is used to investigate the EoS dependence of hot star properties, where entropy per baryon and electron fraction profiles are inspired from proto-neutron star evolution. The $\Gamma$-law analytical thermal EoS used in many simulations is found not to describe well these thermal properties of the EoS. However, it may offer a fair description of the structure of hot stars whenever thermal effects on the baryonic part are small, as shown here for proto-neutron stars starting from several seconds after bounce.

34 pages, 27 figures; contribution to the EPJ A Topical Issue "CompOSE: a repository for Neutron Star Equations of State and Transport Properties"

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Cited by in corpus (29)

• The Science of the Einstein Telescope
• Theoretical and Experimental Constraints for the Equation of State of Dense and Hot Matter
• Merger and post-merger of binary neutron stars with a quark-hadron crossover equation of state
• Holographic modeling of nuclear matter and neutron stars
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• Equations of state for hot neutron stars -- II. The role of exotic particle degrees of freedom
• Dense and Hot QCD at Strong Coupling
• The physics of Core-Collapse Supernovae: explosion mechanism and explosive nucleosynthesis
• Impact of pions on binary neutron star mergers
• Investigating tidal heating in neutron stars via gravitational Raman scattering
• The Role of Baryon Structure in Neutron Stars
• Hot neutron stars and their equation of state
• Frequencies of $f$- and $p$-oscillation modes in cold and hot compact stars
• Gravitational-wave imprints of non-convex dynamics in binary neutron star mergers
• Hyperonic uncertainties in neutron stars, mergers and supernovae
• The impact of hyperons on neutron star mergers: gravitational waves, mass ejection and black hole formation
• Hyperons during proto-neutron star deleptonization and the emission of dark flavoured particles
• Crust (Unified) Tool for Equation-of-state Reconstruction (CUTER) v2
• Investigating the Impact of Higher-Order Phase Transitions in Binary Neutron-Star Mergers
• Influence of the effective mass on the properties of nuclear matter at finite density and temperature
• Dependence of postmerger properties on the thermal heating efficiency in neutron star mergers
• $f$ and $p$ mode oscillation of proto-neutron stars with systematic variation of the nucleon effective mass
• New {\em ab initio} constrained extended Skyrme equations of state for simulations of neutron stars, supernovae and binary mergers: I. Subsaturation density domain
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• Measuring the Low-Energy Weak Mixing Angle with Supernova Neutrinos
• Equation of state for hot hyperonic neutron star matter
• Realistic Equations of State Informing Neutron Star Post-Merger Gravitational-Wave Frequencies
• Recurring region for neutron-star observables
• The thermal index of neutron-star matter in the virial approximation