We present a method to find the stationary solutions for fast flavor oscillations of a homogeneous dense neutrino gas. These solutions correspond to collective precession of all neutrino polarization vectors around a fixed axis in the flavor space on average, and are conveniently studied in the co-rotating frame. We show that these solutions can account for the numerical results of explicit evolution calculations, and that even with the simplest assumption of adiabatic evolution, they can provide the average survival probabilities to good approximation. We also discuss improvement of these solutions and their use as estimates of the effects of fast oscillations in astrophysical environments.
|Original language||English (US)|
|Journal||Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics|
|State||Published - Sep 10 2021|
Bibliographical noteFunding Information:
This work was supported in part by the US Department of Energy [ DE-FG02-87ER40328 ]. We thank the anonymous referee for constructive criticisms and helpful suggestions. Z. X. was partly supported by the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme (ERC Advanced Grant KILONOVA No. 885281 ). Some calculations were carried out at the Minnesota Supercomputing Institute.
© 2021 The Authors
- Dense neutrino gas
- Fast flavor oscillations
- Neutrino oscillations