Fast Flavor Ocillations of Supernova neutrinos in three flavors

30 Aug 2021, 17:10
Talk in parallel session Neutrino physics and astrophysics Discussion Panel Neutrinos 2


Madhurima Chakraborty (IIT Guwahati)


Neutrinos emitted from a core-collapse supernova (SN) may undergo fast flavor
conversions almost immediately above the core, resulting in drastic
consequences for the supernova explosion mechanism and nucleosynthesis.
These fast flavor oscillation dynamics are independent of the neutrino mass,
growing at the scale of the large neutrino-neutrino interaction strength (10^5 km^ −1
) of the dense core which is extremely fast, in comparison to the usual ‘slow’
collective modes driven by much smaller vacuum oscillation frequencies (10^0
km^−1 ). The necessary condition for the existence of these fast instabilities is the
presence of a zero-crossing in the angular distribution of the neutrino lepton
number. The previous literature on fast conversions have focussed on an
effective two-flavor analysis, where the zero crossing in electron lepton number
(ELN) was crucial since the assumption of similar number density of the the
heavy lepton neutrinos lead to similar angular spectra. However, motivated
from the recent supernova simulations with muon production in the accretion
phase, we perform the first non-linear simulations of fast conversions in the
presence of all the three neutrino flavors. Our results show the significance of
muon and tau lepton number angular distributions, along with the traditional
electron lepton number ones and strengthen the need to further investigate the
occurrence of fast conversions in supernova simulation data, including the
degeneracy breaking of mu and tau neutrinos.

Reference to paper (DOI or arXiv) 2005.14204

Primary authors

Madhurima Chakraborty (IIT Guwahati) Dr. Francesco Capozzi ( Virginia Tech., Blacksburg) Dr. Manibrata Sen (UC, Berkeley) Dr. Sovan Chakraborty (IIT Guwahati)

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