Strong magnetic field inside degenerate relativistic plasma and the impacts on the neutrino transport in Core-Collapse Supernovae

TL;DR

This paper investigates how strong magnetic fields in core-collapse supernovae affect neutrino transport, altering neutrino properties and potentially impacting nucleosynthesis outcomes.

Contribution

It introduces a modified neutrino leakage scheme accounting for magnetic field effects and performs 1D simulations to analyze their impact on neutrino behavior.

Findings

Neutrino opacities are increased due to magnetic field effects.

Neutrinos stay longer inside the neutrinosphere, reducing luminosities.

Neutrino energies are initially smaller but peak later after bounce.

Abstract

We study the impacts of magnetic field on the neutrino transport inside core-collapse supernovae (CCSNe). Magnetic field quantizes the momentum of electrons and positrons, resulting in the modification of weak-interaction cross sections and the chemical potentials of electrons and positrons. We include these changes in the leakage scheme of neutrino transport and perform 1D CCSN simulations with GR1D, assuming the postbounce magnetic field strength of $10^{16-17}$ G. The results show that the neutrino opacities are enhanced due to the amplified interaction rates, resulting in a larger neutrinosphere. This further reduces the peak value of neutrino luminosities and their decay rates since neutrinos stay longer inside the neutrinosphere. Meanwhile, the neutrino mean energies are smaller shortly after bounce and reach their peak values at later times. As these neutrino properties are crucial in subsequent nucleosynthesis processes, including the $\nu$p-process, $\nu$-process, and $r$-process, our findings suggest that the magnetic field may leave discernible marks on the abundance pattern of nucleosynthesis in CCSN.