Symmetry energy of super-dense neutron-rich matter from integrating barotropic pressures in neutron stars and heavy-ion reactions

Abstract

Within the minimum model of neutron stars (NS) consisting of neutrons, protons and electrons, a new approach is proposed for inferring the symmetry energy of super-dense neutron-rich nucleonic matter above twice the saturation density ${\rho }_0$ of nuclear matter directly from integrating iteratively barotropic pressures in both neutron stars and heavy-ion reactions. Simultaneously, the proton fraction of NSs at $\beta$ equilibrium is extracted as a function of baryon density from the same procedure. An application of this approach using the NS pressure from GW170817 and the pressure in cold symmetric nuclear matter (SNM) extracted earlier by analyzing nuclear collective flow data in relativistic heavy-ion collisions provides a useful constraining band for the symmetry energy above $2{\rho }_0$.

More discussions and references added. Phys. Lett. B in press

References in corpus (12)

• Results of the ASY-EOS experiment at GSI: The symmetry energy at suprasaturation density
• Symmetry energy from elliptic flow in 197Au + 197Au
• Towards Understanding Astrophysical Effects of Nuclear Symmetry Energy
• Bayesian Inference of High-density Nuclear Symmetry Energy from Radii of Canonical Neutron Stars
• Critical Density and Impact of $\Delta (1232)$ Resonance Formation in Neutron Stars
• Implications from GW170817 for $\Delta$-isobar admixed hypernuclear compact stars
• Implications of the mass $M=2.17_{-0.10}^{+0.11}$M${}_{\odot }$ of PSR~J0740+6620 on the Equation of State of Super-Dense Neutron-Rich Nuclear Matter
• Transport approaches for the Description of Intermediate-Energy Heavy-Ion Collisions
• $\Delta$ (1232) effects in density-dependent relativistic Hartree-Fock theory and neutron stars
• Equation of state of dense matter in the multimessenger era
• Symmetry energy constraints from GW170817 and laboratory experiments
• Cooling timescale for protoneutron stars and properties of nuclear matter: Effective mass and symmetry energy at high densities

Cited by in corpus (3)

• Progress in Constraining Nuclear Symmetry Energy Using Neutron Star Observables Since GW170817
• Probing neutron-star matter in the lab: similarities and differences between binary mergers and heavy-ion collisions
• Constraints on Nuclear Saturation Properties from Terrestrial Experiments and Astrophysical Observations of Neutron Stars