The influence of strong magnetic fields on proto-quark stars

TL;DR

This paper studies how strong magnetic fields influence the evolution, structure, and maximum mass of proto-quark stars, emphasizing the importance of baryon number conservation and magnetic field variation.

Contribution

It introduces a detailed analysis of magnetized quark star evolution considering anisotropic pressures and baryon conservation, highlighting the effects of magnetic field variation.

Findings

Magnetic fields modify quark star masses, but baryon conservation constrains maximum mass.

Magnetic effects are strongest early in the star's evolution when charged particles are abundant.

Spatially varying magnetic fields can support larger magnetic field strengths.

Abstract

We analyze different stages of magnetized quark star evolution incorporating baryon number conservation and using an anisotropic energy momentum tensor. The first stages of the evolution are simulated through the inclusion of trapped neutrinos and fixed entropy per particle, while in the last stage the star is taken to be deleptonized and cold. We find that, although strong magnetic fields modify quark star masses, the evolution of isolated stars needs to be constrained by fixed baryon number, which necessarily lowers the possible star masses. Moreover, magnetic field effects, measured by the difference between the parallel and perpendicular pressures, are more pronounced in the beginning of the star evolution, when there is a larger number of charged leptons and up quarks. We also show that having a spatially varying magnetic field allows for larger magnetic fields to be supported.