Large-mass neutron stars with hyperonization

TL;DR

This paper investigates how in-medium hyperon interactions influence the properties of large-mass neutron stars using a density-dependent relativistic mean-field model, highlighting constraints from recent pulsar measurements.

Contribution

It introduces a density-dependent relativistic mean-field model to study hyperon effects in neutron stars, emphasizing the impact of recent mass measurements on hyperon interaction constraints.

Findings

Hyperonic constituents are possible in large-mass neutron stars.

Recent pulsar mass measurements constrain hyperon interactions.

Nuclear symmetry energy affects hyperonization in neutron stars.

Abstract

Within a density-dependent relativistic mean-field model using in-medium meson-hadron coupling constants and meson masses, we explore effects of in-medium hyperon interactions on properties of neutron stars. It is found that the hyperonic constituents in large-mass neutron stars can not be simply ruled out, while the recently measured mass of the millisecond pulsar J1614-2230 can constrain significantly the in-medium hyperon interactions. Moreover, effects of nuclear symmetry energy on hyperonization in neutron stars are also discussed.