Fast flavor oscillations in dense neutrino media with collisions

We investigate the impact of the nonzero neutrino splitting and elastic neutrino-nucleon collisions on fast neutrino oscillations. Our calculations confirm that a small neutrino mass splitting and the neutrino mass hierarchy have very little effect on fast oscillation waves. We also demonstrate expl...

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Bibliographic Details
Published in:Physical review. D 2021-03, Vol.103 (6), p.1, Article 063001
Main Authors: Martin, Joshua D., Carlson, J., Cirigliano, Vincenzo, Duan, Huaiyu
Format: Article
Language:English
Subjects:
ASTRONOMY AND ASTROPHYSICS
Collisions
Damping
Elastic scattering
Neutrinos
Oscillations
Splitting
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Summary:We investigate the impact of the nonzero neutrino splitting and elastic neutrino-nucleon collisions on fast neutrino oscillations. Our calculations confirm that a small neutrino mass splitting and the neutrino mass hierarchy have very little effect on fast oscillation waves. We also demonstrate explicitly that fast oscillations remain largely unaffected for the time/distance scales that are much smaller than the neutrino mean free path but are damped on larger scales. This damping originates from both the direct modification of the dispersion relation of the oscillation waves in the neutrino medium and the flattening of the neutrino angular distributions over time. Our work suggests that fast neutrino oscillation waves produced near the neutrino sphere can propagate essentially unimpeded which may have ramifications in various aspects of the supernova physics.
ISSN:2470-0010
2470-0029
DOI:10.1103/PhysRevD.103.063001