Dense stellar matter with trapped neutrinos under strong magnetic fields

TL;DR

This paper studies how strong magnetic fields influence the equation of state and structural properties of dense stellar matter, including hyperons and neutrino trapping, affecting star mass, radius, and evolution.

Contribution

It introduces a detailed analysis of magnetic field effects on dense stellar matter using relativistic nuclear models with hyperons and neutrino trapping, highlighting new impacts on star properties.

Findings

Magnetic fields suppress neutrinos at low densities.

Magnetic fields increase the maximum mass of stars.

Magnetic fields reduce the likelihood of protoneutron stars becoming black holes.

Abstract

We investigate the effects of strong magnetic fields on the equation of state of dense stellar neutrino-free and neutrino-trapped matter. Relativistic nuclear models both with constant couplings (NLW) and with density dependent parameters (DDRH) and including hyperons are considered . It is shown that at low densities neutrinos are suppressed in the presence of the magnetic field. The magnetic field reduces the strangeness fraction of neutrino-free matter and increases the strangeness fraction of neutrino-trapped matter. The mass-radius relation of stars described by these equations of state are determined. The magnetic field makes the overall equation of state stiffer and the stronger the field the larger the mass of maximum mass star and the smaller the baryon density at the center of the star. As a consequence in the presence of strong magnetic fields the possibility that a protoneutron star evolves to a blackhole is smaller.