Existence of hyperons in the pulsar PSRJ1614-2230

TL;DR

This paper investigates whether hyperons can exist in the massive pulsar PSRJ1614-2230 by analyzing various nuclear equations of state within relativistic mean-field models, considering constraints from heavy-ion data.

Contribution

It demonstrates that hyperons can be present in the pulsar only with larger meson-hyperon couplings, expanding understanding of dense matter composition in neutron stars.

Findings

Hyperons can exist in PSRJ1614-2230 with larger meson-hyperon couplings.

Hyperon-rich configurations can reach masses comparable to nucleonic matter.

Hyperons constitute about 60% of the matter in maximum mass configurations.

Abstract

The possibility of existence of hyperons in the recently measured $2M_\odot$ pulsar PSRJ1614-2230 is explored using a diverse set of nuclear equations of state calculated within the relativistic mean-field models. Our results indicate that the nuclear equations of state compatible with heavy-ion data allow the hyperons to exist in the PSRJ1614-2230 only for significantly larger values for the meson-hyperon coupling strengths. The maximum mass configurations for these cases contain sizable hyperon fractions ($\sim 60%$) and yet masquared their counterpart composed of only nucleonic matter.