Neutrino fluxes from a core-collapse supernova in a model with three sterile neutrinos

Abstract

The characteristics of the gravitational collapse of a supernova and the fluxes of active and sterile neutrinos produced during the formation of its protoneutron core have been calculated numerically. The relative yields of active and sterile neutrinos in core matter with different degrees of neutronization have been calculated for various input parameters and various initial conditions. A significant increase in the fraction of sterile neutrinos produced in superdense core matter at the resonant degree of neutronization has been confirmed. The contributions of sterile neutrinos to the collapse dynamics and the total flux of neutrinos produced during collapse have been shown to be relatively small. The total luminosity of sterile neutrinos is considerably lower than the luminosity of electron neutrinos, but their spectrum is considerably harder at high energies.

Oscillations of Active Neutrinos at Short Baseline in the Model with Three Decaying Sterile Neutrinos

“…Let us specify the neutrino masses using a normally ordered set of values {m} = {m i , m i }. For the masses of active neutrinos, we take the estimates of the neutrino masses proposed in [40][41][42] for the NO case (in units of eV), which do not contradict to up-to-date experimental data:…”

Sterile neutrinos influence on oscillation characteristics of active neutrinos at short distances in the generalized model of neutrino mixing

“…45 the effect of increasing of sterile neutrinos yield in a high-density medium when the ratio of the number of neutrons to the number of protons approaches to two was considered in detail. This effect can have impact on the characteristics of fluxes of active neutrinos in supernovae 46,47 . Phenomenological models with additional SN and HN are usually denoted as (3+N ) models, or, in detail, as (k+3+n+m) models,…”