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Non-conservation of Lepton Numbers in the Neutrino Sector Could Change the Prospects for Core Collapse Supernova Explosions
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abstract
We show that interactions violating the conservation of lepton numbers in the neutrino sector could significantly alter the standard low entropy picture for the pre-supernova collapsing core of a massive star. A rapid neutrino-antineutrino equilibration leads to entropy generation and enhanced electron capture and, hence, a lower electron fraction than in the standard model. This would affect the downstream core evolution, the prospects for a supernova explosion, and the emergent neutrino signal. If realized by lepton-number-violating neutrino self-interactions (LNV $\nu$SI), the relevant mediator mass and coupling ranges can be probed by future accelerator-based experiments.
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Constraints on Neutrino Secret Interactions from Multi-messenger Neutrinos Scattering on C$\nu$B
Astrophysical neutrinos traveling through the cosmic neutrino background set new, generally stronger upper bounds on secret neutrino self-interactions, especially for a vector mediator at low mass.
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