Collective Oscillations of Majorana Neutrinos in Strong Magnetic Fields and Self-induced Flavor Equilibrium

Understand

We study collective oscillations of Majorana neutrinos in some of the most extreme astrophysical sites such as neutron star merger remnants and magneto-rotational core-collapse supernovae which include dense neutrino media in the presence of strong magnetic fields.

• We show that neutrinos can reach flavor equilibrium if neutrino transition magnetic moment $\mu_\nu$ is strong enough, namely when $\mu_\nu/\mu_{\rm{B}} \gtrsim 10^{-14}-10^{-15}$ with $\mu_{\rm{B}}$ being the Bohr magneton.
• This sort of flavor equilibrium, which is not necessarily flavor equipartition, can occur on (short) scales determined by the strength of the magnetic term.
• Our findings can have interesting implications for the physics of such violent astrophysical environments.