Neutron stars including the effects of chaotic magnetic fields and the anomalous magnetic moments

TL;DR

This study models neutron stars with strong magnetic fields using an extended relativistic mean field approach, revealing that magnetic effects significantly increase maximum mass, while anomalous magnetic moments have a minor impact.

Contribution

It introduces the inclusion of chaotic magnetic fields and anomalous magnetic moments into neutron star modeling within the RMF framework, providing new insights into their effects on star properties.

Findings

Magnetic fields increase neutron star maximum mass by about 6%.

Anomalous magnetic moments slightly increase maximum mass by 0.02 solar masses.

Neutral particles become spin polarized due to AMMs.

Abstract

In this work the relativistic mean field (RMF) FSUGold model extended to include hyperons is employed to study the properties of neutron stars with strong magnetic fields. The chaotic magnetic field approximation is utilized. The effect of the anomalous magnetic moments (AMMs) is also investigated. It is shown that the equation of state (EOS)of neutron star matter is stiffened by the presence of the magnetic field, which increases the maximum mass of neutron star by around 6%. The AMMs only have a small influence on the EOS of neutron star matter, and increase the maximum mass of neutron star by 0.02 M$_{sun}$. Neutral particles are spin polarized due to the presence of the AMMs.