Warm and dense stellar matter under strong magnetic fields

TL;DR

This paper studies how strong magnetic fields influence the equation of state of warm stellar matter in protoneutron stars, revealing effects on neutrino behavior and implications for black hole formation.

Contribution

It introduces a relativistic mean field model including hyperons and analyzes magnetic field effects on neutrino suppression and stellar evolution.

Findings

Magnetic fields suppress neutrino presence at low densities.

Strong magnetic fields prevent low-mass black hole formation during early evolution.

Magnetic field decay may lead to black hole formation after cooling.

Abstract

We investigate the effects of strong magnetic fields on the equation of state of warm stellar matter as it may occur in a protoneutron star. Both neutrino free and neutrino trapped matter at a fixed entropy per baryon are analyzed. A relativistic mean field nuclear model, including the possibility of hyperon formation, is considered. A density dependent magnetic field with the magnitude $10^{15}$ G at the surface and not more than $3\times 10^{18}$ G at the center is considered. The magnetic field gives rise to a neutrino suppression, mainly at low densities, in matter with trapped neutrinos. It is shown that an hybrid protoneutron star will not evolve to a low mass blackhole if the magnetic field is strong enough and the magnetic field does not decay. However, the decay of the magnetic field after cooling may give rise to the formation of a low mass blackhole.