Hyperon Stars in Strong Magnetic Fields

TL;DR

This paper studies how extremely strong magnetic fields influence the structure and composition of hyperon stars using a hadronic model and solving TOV equations, revealing significant effects on their mass-radius relation.

Contribution

It introduces a parametric magnetic field model and analyzes its impact on hyperon star properties within a hadronic framework, including Landau quantization effects.

Findings

Strong magnetic fields increase the maximum mass of hyperon stars.

Magnetic fields alter the particle population and composition of the stars.

The mass-radius relation is significantly affected by magnetic field strength.

Abstract

We investigate the effects of strong magnetic fields on the properties of hyperon stars. The matter is described by a hadronic model with parametric coupling. The matter is considered to be at zero temperature, charge neutral, beta-equilibrated, containing the baryonic octet, electrons and muons. The charged particles have their orbital motions Landau-quantized in the presence of strong magnetic fields (SMF). Two parametrisations of a chemical potential dependent static magnetic field are considered, reaching $1-2 \times 10^{18}\,G$ in the center of the star. Finally, the Tolman-Oppenheimer-Volkov (TOV) equations are solved to obtain the mass-radius relation and population of the stars.