Existence of hyperons in the pulsar PSRJ1614-2230

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.

Comments: 24 page including 8 figures, Nuclear Phys. A (in press)