Neutrino Flavor Evolution in Neutron Star Mergers

Understand

We examine the flavor evolution of neutrinos emitted from the disk-like remnant (hereafter called \lq\lq neutrino disk\rq\rq) of a binary neutron star (BNS) merger.

• We specifically follow the neutrinos emitted from the center of the disk, along the polar axis perpendicular to the equatorial plane.
• We carried out two-flavor simulations using a variety of different possible initial neutrino luminosities and energy spectra, and for comparison, three-flavor simulations in specific cases.
• In all simulations, the normal neutrino mass hierarchy was used.