  Accretion disks arising from neutron star- neutron star mergers or black
hole- neutron star mergers produce large numbers of neutrinos and
antineutrinos. In contrast to other astrophysical scenarios, like supernovae,
in mergers the antineutrinos outnumber the neutrinos. This antineutrino
dominance gives neutrinos from merger disks the opportunity to exhibit new
oscillation physics, specifically a matter-neutrino resonance. We explore this
resonance, finding that consequences can be a large transition of $\nu_e$ to
other flavors, while the $\bar{\nu}_e$s return to their initial state. We
present numerical calculations of neutrinos from merger disks and compare with
a single energy model. We explain both the basic features and the conditions
for a transition.
