Author:
Abbar Sajad,Capozzi Francesco
Abstract
Abstract
Neutrinos propagating in dense neutrino media
such as core-collapse supernovae
and neutron star merger remnants
can experience the so-called fast flavor
conversions on scales
much shorter than those expected in vacuum. A very generic class of fast flavor instabilities is the ones which are produced by the backward scattering
of neutrinos off the nuclei at relatively large distances from the supernova core.
In this study we demonstrate that despite their ubiquity, such fast instabilities are unlikely
to cause significant flavor conversions
if the population of neutrinos in the backward direction is not large enough.
Indeed, the scattering-induced instabilities can mostly impact the
neutrinos traveling in the backward direction, which represent only a small fraction of neutrinos at large radii.
We show that this can be explained by the shape
of the unstable flavor eigenstates, which can be extremely peaked at the backward angles.
Subject
Astronomy and Astrophysics
Cited by
29 articles.
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