Seminar of the department “Theory of Fundamental Interactions”

Date and Time: Wednesday, 10 February 2021, at 11:00 AM

Venue: online seminar on Zoom, Bogoliubov Laboratory of Theoretical Physics

Seminar topic: «The relic neutrino composition as seen from Earth»

Speaker: A. N. Baushev

Abstract:

Being generated, the relic neutrino background contained equal fractions of electron ν_e, muon ν_μ, and taon ν_τ neutrinos. We show that the gravitational field of our Galaxy and other nearby cosmic objects changes this composition near the Solar System, enriching it with the heaviest neutrino ν₃. This mass state is almost free of the electron component (only ∼2% of ν_e) and contains more muon component than the tau one. As a result, the relic background becomes enriched with taon and particularly muon neutrinos. The electron relic neutrinos are the rarest for a terrestrial observer: instead of 1/3, the relic background may contain only ≳20% of them. Moreover, the speaker will inform about recent significant changes in the acceptance procedure of arxiv.org.