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Collective effects in supernova neutrinos

Grant number: 22/09421-8
Support type:Scholarships abroad - Research Internship - Doctorate (Direct)
Effective date (Start): November 02, 2022
Effective date (End): November 01, 2023
Field of knowledge:Physical Sciences and Mathematics - Physics - Elementary Particle Physics and Fields
Principal researcher:Ernesto Kemp
Grantee:Pedro Dedin Neto
Supervisor abroad: Irene Tamborra
Home Institution: Instituto de Física Gleb Wataghin (IFGW). Universidade Estadual de Campinas (UNICAMP). Campinas , SP, Brazil
Research place: University of Copenhagen, Denmark  
Associated to the scholarship:22/01568-0 - Mass hierarchy effects in supernova neutrinos, BP.DD

Abstract

When a neutrino is emitted from a supernova, it changes its initial flavor as it propagates through the supernova. However, we still do not have a clear theoretical picture of the flavor conversion mechanism, mostly due to neutrino-neutrino interactions. When these interactions are included the evolution equation becomes nonlinear, resulting in a collective evolution of the neutrinos. Among the resulting phenomena, we have slow and fast flavor conversions. The first happens at the time scale of the neutrino vacuum oscillation frequencies É. The last, more recently explored, happens at the time scale of the neutrino-neutrino potential ¼, and emerges from models that present electron lepton number crossing in the angular distribution of neutrinos. Both phenomena emerge from the same evolution equation and yet no complete description of both and their interplay has been developed, remaining a mystery their consequences in a supernova. In this context, this project aims to explore and understand better this interplay, together with its consequences for supernova neutrinos. (AU)

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