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Similar

Then

Lucas Johns, “Collisional flavor instabilities of supernova neutrinos,” (2021), arXiv:2104.11369
Original
2021
Later among the works it cites.
Joshua D. Martin, J. Carlson, Vincenzo Cirigliano, and Huaiyu Duan, “Fast flavor oscillations in dense neutrino media with collisions,” Phys. Rev. D 103
Original
2021
Later among the works it cites.
Sherwood Richers, Donald Willcox, and Nicole Ford, “Neutrino fast flavor instability in three dimensions,” Phys. Rev. D 104
Original
2021
Later among the works it cites.
Meng-Ru Wu, Manu George, Chun-Yu Lin, and Zewei Xiong, “Collective fast neutrino flavor conversions in a 1D box: Initial conditions and long-term evolution,” Phys. Rev. D 104
Original
2021
Later among the works it cites.
Ian Padilla-Gay and Shashank Shalgar, “Fast flavor conversion of neutrinos in presence of matter bulk velocity,” (2021), arXiv:2108.00012

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2022

Neutrino Fast Flavor Pendulum. Part 2: Collisional Damping

Padilla-Gay, Ian, Tamborra, Irene, Raffelt, Georg G.

Understand

In compact astrophysical objects, the neutrino density can be so high that neutrino-neutrino refraction can lead to fast flavor conversion of the kind $\nu_e \bar\nu_e \leftrightarrow \nu_x \bar\nu_x$ with $x=\mu,\tau$, depending on the neutrino angle distribution.

Previously, we have shown that in a homogeneous, axisymmetric two-flavor system, these collective solutions evolve in analogy to a gyroscopic pendulum.
In flavor space, its deviation from the weak-interaction direction is quantified by a variable $\cos\vartheta$ that moves between $+1$ and $\cos\vartheta_{\rm min}$, the latter following from a linear mode analysis.
As a next step, we include collisional damping of flavor coherence, assuming a common damping rate $\Gamma$ for all modes.