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Coherence and flavor transformations of supernova neutrinos

Grant number: 19/22961-9
Support type:Scholarships abroad - Research Internship - Doctorate (Direct)
Effective date (Start): December 18, 2019
Effective date (End): December 17, 2020
Field of knowledge:Physical Sciences and Mathematics - Physics - Elementary Particle Physics and Fields
Principal Investigator:Orlando Luis Goulart Peres
Grantee:Yago Philippe Porto Silva
Supervisor abroad: Alexei Yuryevich Smirnov
Home Institution: Instituto de Física Gleb Wataghin (IFGW). Universidade Estadual de Campinas (UNICAMP). Campinas , SP, Brazil
Local de pesquisa : Max Planck Society, Heidelberg, Germany  
Associated to the scholarship:17/05515-0 - Non-standard neutrino interactions in longbaseline neutrino experiment, BP.DD

Abstract

Supernovae produced by the collapse of massive stars produce large fluxes of neutrinos that could be detected on the Earth. However, many details of the neutrino flavor transformations at this stage of stellar evolution are not yet fully understood, and new phenomena, such as collective oscillations, could arise. The produced neutrino wave-packets are very short and, therefore, might undergo fast spatial separation and propagation decoherence together with flavor evolution. We intend to study the spatial separation of the wave-packets by assuming that all neutrinos in the environmental background travel in the same direction. This assumption is supposed to simplify the problem and allow us to find the evolution equation for the propagating neutrino.