Vacuum fluctuation effects on hyperonic neutron star matter

TL;DR

This paper investigates how vacuum fluctuation effects influence the properties of hyperonic neutron star matter within the relativistic mean field framework, revealing their impact on the equation of state and star characteristics.

Contribution

It introduces vacuum fluctuation corrections into hyperonic neutron star matter models and compares different meson-hyperon coupling schemes, providing new insights into star mass and radius predictions.

Findings

VF effects soften the EoS and reduce maximum star masses.

Presence of δ field increases star masses and radii.

Maximum hyperonic neutron star masses range from 1.33 to 1.55 solar masses.

Abstract

The vacuum fluctuation (VF) effects on the properties of the hyperonic neutron star matter are investigated in the framework of the relativistic mean field (RMF) theory. The VF corrections result in the density dependence of in-medium baryon and meson masses. We compare our results obtained by adopting three kinds of meson-hyperon couplings. The introduction of both hyperons and VF corrections soften the equation of state (EoS) for the hyperonic neutron star matter and hence reduce hyperonic neutron star masses. The presence of the $\delta$ field enlarges the masses and radii of hyperonic neutron stars. Taking into account the uncertainty of meson-hyperon couplings, the obtained maximum masses of hyperonic neutron stars are in the range of $1.33M_{\odot}\sim1.55M_{\odot}$.