Evolution of Urca Pairs in the Crusts of Highly Magnetized Neutron Stars

Abstract

We report on the effects of strong magnetic fields on neutrino emission in the modified Urca process. We show that the effect of Landau levels on the various Urca pairs affects the neutrino emission spectrum and leads to an angular asymmetry in the neutrino emission. For low magnetic fields the Landau levels have almost no effect on the cooling. However, as the field strength increases, the electron chemical potential increases resulting in a lower density at which Urca pairs can exist. For intermediate field strength there is an interesting interference between the Landau level distribution and the Fermi distribution. For high enough field strength, the entire electron energy spectrum is eventually confined to single Landau level producing dramatic spikes in the emission spectrum.

References in corpus (4)

• Updated constraint on a primordial magnetic field during big bang nucleosynthesis and a formulation of field effects
• Electron fraction constraints based on Nuclear Statistical Equilibrium with beta equilibrium
• Nuclear Reaction Screening, Weak Interactions, and r-Process Nucleosynthesis in High Magnetic Fields
• A Relativistic Quantum Approach to Neutrino and Antineutrino Emissions via the Direct Urca Process in Strongly Magnetized Neutron-Star Matter

Cited by in corpus (1)

• Dense Matter in Neutron Stars with eXTP