Solution of the Hyperon Puzzle within a Relativistic Mean-Field Model

TL;DR

This paper models the dense matter inside neutron stars using a relativistic mean-field approach, incorporating hyperons and meson mass scaling to produce a stiff equation of state consistent with astrophysical and experimental data.

Contribution

It introduces a novel relativistic mean-field model with universal hadron mass scaling and differential coupling constants to address the hyperon puzzle in neutron stars.

Findings

Equation of state remains stiff with meson mass reduction.

Model matches astrophysical constraints.

Hyperons are included without softening the EoS excessively.

Abstract

The equation of state of cold baryonic matter is studied within a relativistic mean-field model with hadron masses and coupling constants depending on the scalar field. All hadron masses undergo a universal scaling, whereas the coupling constants are scaled differently. The appearance of hyperons in dense neutron star interiors is accounted for, however the equation of state remains sufficiently stiff if a reduction of the $\phi$ meson mass is included. Our equation of state matches well the constraints known from analyses of the astrophysical data and the particle production in heavy-ion collisions.