Some Recent Results on Neutrino Oscillations in Hypercritical Accretion

TL;DR

This paper explores neutrino flavor oscillations in hypercritical accretion scenarios related to gamma-ray bursts, highlighting the influence of neutrino self-interactions in extreme astrophysical environments.

Contribution

It presents new insights into neutrino oscillation behavior in hypercritical accretion onto neutron stars and black holes, emphasizing the role of self-interactions.

Findings

Neutrino oscillations occur in hypercritical accretion environments.

Neutrino self-interactions significantly affect flavor oscillations.

Conditions of density and temperature are conducive to oscillations.

Abstract

The study of neutrino flavour oscillations in astrophysical sources has been boosted in the last two decades thanks to achievements in experimental neutrino physics and observational astronomy. We here discuss two cases of interest in the modelling of short and long gamma-ray bursts (GRBs): hypercritical, i.e. highly super-Eddington spherical/disk accretion onto a neutron star (NS)/black hole (BH). We show that in both systems the ambient conditions of density and temperature imply the occurrence of neutrino flavour oscillations, with a relevant role of neutrino self-interactions.