On Fast Neutrino Flavor Conversion Modes in the Nonlinear Regime. (arXiv:1811.04215v1 [astro-ph.HE])
<a href="http://arxiv.org/find/astro-ph/1/au:+Abbar_S/0/1/0/all/0/1">Sajad Abbar</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Volpe_M/0/1/0/all/0/1">Maria Cristina Volpe</a>
A dense neutrino medium could experience self-induced flavor conversions on
relatively small scales in the presence of the so-called fast flavor conversion
modes. Owing to the fact that fast conversion scales could be much smaller than
the ones of the traditional collective neutrino oscillations, it has been
speculated that fast modes could lead to some sort of flavor equilibrium. We
study the evolution of fast modes in the nonlinear regime and we show that not
only fast modes are not guaranteed to lead to flavor equilibrium, but also they
could lead to usual collective neutrino oscillations on scales determined by
neutrino number density. For the $nu_e$ dominated case, we observe large
amplitude collective oscillations, whereas a sort of flavor stabilization is
reached for the $bar{nu}_e$ dominated case.
A dense neutrino medium could experience self-induced flavor conversions on
relatively small scales in the presence of the so-called fast flavor conversion
modes. Owing to the fact that fast conversion scales could be much smaller than
the ones of the traditional collective neutrino oscillations, it has been
speculated that fast modes could lead to some sort of flavor equilibrium. We
study the evolution of fast modes in the nonlinear regime and we show that not
only fast modes are not guaranteed to lead to flavor equilibrium, but also they
could lead to usual collective neutrino oscillations on scales determined by
neutrino number density. For the $nu_e$ dominated case, we observe large
amplitude collective oscillations, whereas a sort of flavor stabilization is
reached for the $bar{nu}_e$ dominated case.
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