Neutrino Oscillation in a Static Dihole Geometry

Abstract

We investigate neutrino flavor oscillations in the static equal-mass Majumdar-Papapetrou dihole geometry, restricting the propagation to the symmetry plane. Within the null approximation, we derive the leading contribution to the neutrino phase and numerically evaluate the geodesic integrals. For two neutrino flavors, interference between different trajectories introduces a dependence on the individual neutrino masses and on the neutrino mass ordering for nonmaximal mixing. We analyze the transition probability in different spacetime configurations possessing two light rings, a merged light ring (critical configuration), and no light rings in the equatorial plane. In the weak-lensing regime, the transition probability generally increases with the black holes' individual masses, while variations in the half-separation produce no qualitative change in the transition probability. In stronger-lensing configurations, variations in both the mass and half-separation modify the heights and positions of the extrema, with no monotonic increase or decrease in the transition probability. For the critical and no-light-ring configurations studied, we identify three zero-winding trajectories connecting the source and detector, including one passing near the symmetry axis. The probability remains oscillatory, and its oscillatory pattern depends strongly on the neutrino energy.