Hyperonic neutron stars: reconciliation between nuclear properties and NICER and LIGO/VIRGO results

TL;DR

This paper introduces an extended Quantum Hadrodynamics-based equation of state that accurately models nuclear matter and neutron star properties, including hyperons, mass, radius, and tidal deformability, aligning with NICER and LIGO/VIRGO observations.

Contribution

It presents a new microscopic EoS within QHD that reproduces nuclear matter properties and supports massive hyperonic neutron stars consistent with recent astrophysical data.

Findings

Supports neutron stars with masses ≥ 2.00 solar masses

Reproduces observed neutron star radii and tidal parameters

Accommodates hyperons without compromising maximum mass

Abstract

Using a extended version of the Quantum Hadrodynamics (QHD), I propose a new microscopic equation of state (EoS) able to correctly reproduce the main properties of symmetric nuclear matter at the saturation density, as well produce massive neutron stars and satisfactory results for the radius and the tidal parameter $\Lambda$. I show that even when hyperons are present, this EoS is able to reproduce at least 2.00 solar masses neutron star. The constraints about the radius of a $2.00M_\odot$ and the minimum mass that enable direct Urca effect are also checked.