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Annual Review of Nuclear and Particle Science

Volume 71, 2021

New Developments in Flavor Evolution of a Dense Neutrino Gas

Abstract

Neutrino–neutrino refraction dominates the flavor evolution in core-collapse supernovae, neutron star mergers, and the early Universe. Ordinary neutrino flavor conversions develop on timescales determined by the vacuum oscillation frequency. However, when the neutrino density is large enough, collective flavor conversions may arise because of pairwise neutrino scattering. Pairwise conversions are deemed fast because they are expected to occur on timescales that depend on the neutrino–neutrino interaction energy (i.e., on the neutrino number density) and are regulated by the angular distributions of electron neutrinos and antineutrinos. The enigmatic phenomenon of fast pairwise conversions has been overlooked for a long time. However, because of the fast conversion rate, pairwise conversions could occur in the proximity of the neutrino decoupling region with yet-to-be-understood implications for the hydrodynamics of astrophysical sources and the synthesis of the heavy elements. We review the physics of this fascinating phenomenon and its implications for neutrino-dense sources.

Keyword(s): core-collapse supernovae, early Universe, flavor conversions, neutrinos, neutron star mergers
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2021-09-21
2024-05-05
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New Developments in Flavor Evolution of a Dense Neutrino Gas
Annual Review of Nuclear and Particle Science 71, 165 (2021); https://doi.org/10.1146/annurev-nucl-102920-050505
/content/journals/10.1146/annurev-nucl-102920-050505
/content/journals/10.1146/annurev-nucl-102920-050505
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