Asymmetric Neutrino Production in Strongly Magnetized Proto-Neutron Stars

TL;DR

This paper investigates how strong magnetic fields in proto-neutron stars cause asymmetric neutrino emission by calculating the neutrino production cross-section, revealing increased flux along magnetic field lines.

Contribution

It introduces a new equation of state parameter set within a relativistic mean-field model to accurately describe neutron stars and analyzes the impact of magnetic fields on neutrino flux asymmetry.

Findings

Neutrino flux is enhanced along magnetic field direction.

Flux decreases in the opposite direction.

Neutrino production amplifies flux asymmetry.

Abstract

We calculate the neutrino production cross-section through the direct URCA process in proto-neutron star matter in the presence of a strong magnetic field. We assume isoentropic conditions and introduce a new equation of state parameter-set in the relativistic mean-field approach that can reproduce neutron stars with $M > 1.96$ M$_\odot$ as required by observations. We find that the production process increases the flux of emitted neutrinos along the direction parallel to the magnetic field and decreases the flux in the opposite direction. This means that the neutrino flux asymmetry due to the neutrino absorption and scattering processes in a magnetic field becomes larger by the inclusion of the neutrino production process.