Helicity coherence in binary neutron star mergers and non-linear feedback

Understand

Neutrino flavor conversion studies based on astrophysical environments usually implement neutrino mixings, neutrino interactions with matter and neutrino self-interactions.

• In anisotropic media, the most general mean-field treatment includes neutrino mass contributions as well, that introduce a coupling between neutrinos and antineutrinos termed helicity or spin coherence.
• We discuss resonance conditions for helicity coherence for Dirac and Majorana neutrinos.
• We explore the role of these mean-field contributions on flavor evolution in the context of a binary neutron star merger remnant.