Hybrid Stars in a Strong Magnetic Field

TL;DR

This paper investigates how strong magnetic fields influence the particle composition, equation of state, and macroscopic properties of hybrid stars, revealing magnetic field-induced anisotropy and modifications in star characteristics.

Contribution

It introduces an extended SU(3) sigma model to analyze the impact of magnetic fields and anomalous magnetic moments on hybrid star properties, including anisotropy effects.

Findings

Magnetic fields significantly alter star mass and cooling curves.

High magnetic fields induce anisotropy in hybrid stars.

Particle populations are affected by magnetic field strength.

Abstract

We study the effects of high magnetic fields on the particle population and equation of state of hybrid stars using an extended hadronic and quark SU(3) non-linear realization of the sigma model. In this model the degrees of freedom change naturally from hadrons to quarks as the density and/or temperature increases. The effects of high magnetic fields and anomalous magnetic moment are visible in the macroscopic properties of the star, such as mass, adiabatic index, moment of inertia, and cooling curves. Moreover, at the same time that the magnetic fields become high enough to modify those properties, they make the star anisotropic.