Another look at synchronized neutrino oscillations

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• 作者：Evgeny Akhmedov^a ; ¹ ; ^{akhmedov@mpi-hd.mpg.de" class="auth_mail" title="E-mail the corresponding author} ; Alessandro Mirizzi^b ; ^c ; ^{alessandro.mirizzi@ba.infn.it" class="auth_mail" title="E-mail the corresponding author}
• 刊名：Nuclear Physics B
• 出版年：2016
• 出版时间：July 2016
• 年：2016
• 卷：908
• 期：Complete
• 页码：382-407
• 全文大小：493 K

文摘

In dense neutrino backgrounds present in supernovae and in the early Universe neutrino oscillations may exhibit complex collective phenomena, such as synchronized oscillations, bipolar oscillations and spectral splits and swaps. We consider in detail possible decoherence effects on the simplest of these phenomena – synchronized neutrino oscillations that can occur in a uniform and isotropic neutrino gas. We develop an exact formalism of spectral moments of the flavour spin vectors describing such a system and then apply it to find analytical approaches that allow one to study decoherence effects on its late-time evolution. This turns out to be possible in part due to the existence of the (previously unknown) exact conservation law satisfied by the quantities describing the considered neutrino system. Interpretation of the decoherence effects in terms of neutrino wave packet separation is also given, both in the adiabatic and non-adiabatic regimes of neutrino flavour evolution.