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Network in Neutrinos, Nuclear Astrophysics, and Symmetries (N3AS) Seminars

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Theory of Fast Flavor Conversion of Supernova Neutrinos
Date: Tuesday, March 30th
Time: 2:00 pm
Place: hosted by Baha Balantekin
Speaker: Soumya Bhattacharyya, Tata Institute of Fundamental Research
Abstract: A supernova natively emits neutrinos and antineutrinos of all flavors with different luminosities and energy spectra. These neutrinos can undergo neutrino-neutrino forward-scattering inside the dense anisotropic interior of the star and can lead to ``Fast Neutrino Flavor Conversion''. We present the first ever theory of ``Fast Neutrino Flavor Conversion'' beyond the linear regime to show how the different neutrino flavors are brought closer to each other or in other words ``Flavor Depolarizes'' due to irreversible decoherence-like processes occurring at a Tera-Hz rate, determined by the large neutrino density. Our theory explains how depolarization happens, when does it happen, what determines the epoch and finally describes a method to calculate the extent of depolarized fluxes. This new result allows detailed implementation of flavor-dependent neutrino transport in supernova simulations and paves the way for supernova neutrino phenomenology.
Host: Baha Balantekin
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