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Fast Flavor Depolarization of Supernova Neutrinos

Soumya Bhattacharyya and Basudeb Dasgupta
Phys. Rev. Lett. 126, 061302 – Published 11 February 2021
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Abstract

Flavor-dependent neutrino emission is critical to the evolution of a supernova and its neutrino signal. In the dense anisotropic interior of the star, neutrino-neutrino forward scattering can lead to fast collective neutrino oscillations, which has striking consequences. We present a theory of fast flavor depolarization, explaining how neutrino flavor differences become smaller, i.e., depolarize, due to diffusion to smaller angular scales. We show that transverse relaxation determines the epoch of this irreversible depolarization. We give a method to compute the depolarized fluxes, presenting an explicit formula for simple initial conditions, which can be a crucial input for supernova theory and neutrino phenomenology.

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  • Received 14 September 2020
  • Revised 21 October 2020
  • Accepted 15 January 2021

DOI:https://doi.org/10.1103/PhysRevLett.126.061302

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Particles & FieldsGravitation, Cosmology & AstrophysicsInterdisciplinary Physics

Authors & Affiliations

Soumya Bhattacharyya* and Basudeb Dasgupta

  • Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai, 400005, India

  • *soumyaquanta@gmail.com
  • bdasgupta@theory.tifr.res.in

See Also

Elaborating the ultimate fate of fast collective neutrino flavor oscillations

Soumya Bhattacharyya and Basudeb Dasgupta
Phys. Rev. D 106, 103039 (2022)

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Issue

Vol. 126, Iss. 6 — 12 February 2021

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