Constraining nuclear matter parameters and neutron star observables using PREX-2 and NICER data

Abstract

We try to constraints some of the nuclear matter parameters such as symmetry energy (J) and its slope (L) from the recent inferred data of the PREX-2. Other nuclear matter parameters are adopted from [Phys. Rev. C 85 035201 (2012), Phys. Rev. C 90 055203 ( 2014)] papers and the linear correlation among them are checked by using the Pearson's formula. We find the correlation between J − L, Kτ − J and Kτ − L with coefficients 0.85, 0.81 and 0.76 respectively. The neutron star properties such as mass and radius are calculated with 50 unified equation of states. The results are consistent with recently observed pulsars and NICER data except few exceptions. From the radii constraints, we find that the new NICER data allows a narrow radius range contrary to a large range of PREX-2 and the old NICER data leaving us an inconclusive determination of the neutron star radius.

Probing neutron-star matter in the lab: connecting binary mergers to heavy-ion collisions

“…A meaningful comparison between the regimes probed in BNS mergers and HICs requires a realistic, consistent model for the EOS that is valid across a very large portion of the QCD phase diagram. Such a description should be consistent with constraints from cold compact stars (e.g., [34][35][36][37][38][39][40][41]), properties of symmetric nuclear matter around nuclear saturation density n sat [42][43][44][45][46][47][48][49][50][51][52][53][54][55], as well as large temperature QCD constraints at vanishing and finite density. In the latter case, a consistent description for chiralsymmetry restoration and quark deconfinement must be included to reproduce data from lattice QCD [56][57][58], perturbative QCD [59,60], and high-energy collider experiments [61].…”