A New Open-Source Nuclear Equation of State Framework based on the Liquid-Drop Model with Skyrme Interaction

Abstract

The equation of state (EOS) of dense matter is an essential ingredient for numerical simulations of core-collapse supernovae and neutron star mergers. The properties of matter near and above nuclear saturation density are uncertain, which translates into uncertainties in astrophysical simulations and their multi-messenger signatures. Therefore, a wide range of EOSs spanning the allowed range of nuclear interactions are necessary for determining the sensitivity of these astrophysical phenomena and their signatures to variations in input microphysics. We present a new set of finite temperature EOSs based on experimentally allowed Skyrme forces. We employ a liquid drop model of nuclei to capture the non-uniform phase of nuclear matter at sub-saturation density, which is blended into a nuclear statistical equilibrium EOS at lower densities. We also provide a new, open-source code for calculating EOSs for arbitrary Skyrme parametrizations. We then study the effects of different Skyrme parametrizations on thermodynamical properties of dense astrophysical matter, the neutron star mass-radius relationship, and the core collapse of 15 and 40 solar mass stars.

30 pages, 16 figures. Submitted to PRC. Source code and EOS tables available at https://stellarcollapse.org/SROEOS Comments welcome. We have fixed an error with chemical potential normalization in our code. Results in the simulation section have been updated

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Cited by in corpus (14)

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• Equations of state for hot neutron stars -- II. The role of exotic particle degrees of freedom
• Cooling timescale for protoneutron stars and properties of nuclear matter: Effective mass and symmetry energy at high densities
• The physics of Core-Collapse Supernovae: explosion mechanism and explosive nucleosynthesis
• Full distribution of clusters with universal couplings and in-medium effects
• Bosonic dark matter dynamics in hybrid neutron stars
• Hot neutron stars and their equation of state
• Time Dependent Radiation Hydrodynamics on a Moving Mesh
• Geometric and thermodynamic characterization of binary neutron star accretion discs
• Unveiling the Nature of Gravitational-Wave Emission in Core-collapse Supernovae with Perturbative Analysis
• Nuclear pasta in hot and dense matter and its influence on the equation of state for astrophysical simulations
• Equation of state and neutrino transfer in supernovae and neutron stars
• Analysis of critical parameters for nonrelativistic models in symmetric nuclear matter