Asymmetric Neutrino Emission from Magnetized Proto-Neutron Star Matter including Hyperons in Relativistic Mean Field Theory

TL;DR

This paper calculates how strong magnetic fields in proto-neutron star matter with hyperons cause asymmetric neutrino interactions, potentially explaining pulsar kicks.

Contribution

It introduces a relativistic mean field model including hyperons to quantify neutrino cross section asymmetries in magnetized neutron-star matter.

Findings

Asymmetry in neutrino cross sections is 2-4% at relevant densities and temperatures.

Magnetic field effects are comparable to parity violation effects in pulsar kicks.

Hyperons influence the magnitude of neutrino interaction asymmetries.

Abstract

We calculate asymmetric neutrino absorption and scattering cross sections on hot and dense magnetized neutron-star matter including hyperons in fully relativistic mean field theory. The absorption/scattering cross sections are suppressed/enhanced incoherently in the direction of the magnetic fielld, B. The asymmetry is 2-4% at the matter density \rho_0 < \rho_B < 3\rho_0 and temperature T < 40 MeV for B=2 X 10^{17} G. This asymmetry is comparable to the effects owing to parity violation or asymmetric magnetic field topology proposed for the origin of pulsar kicks.