Speaker
Description
In curved spacetime, neutrinos experience an extra contribution to their effective Hamiltonian from a four-fermion interaction induced by spacetime geometry, specifically by torsion. This interaction is parity-violating, non-universal, and diagonal in the mass basis, and thus causes neutrino mixing while propagating through a fermionic matter background. It can significantly influence neutrino conversion and survival probabilities. Since this term varies linearly with matter density, long baseline (LBL) accelerator neutrino experiments as well as atmospheric neutrino experiments would be good choices to probe this effect. We calculate bounds on the torsional coupling parameters and also study the impact of this novel interaction on physics sensitivities, namely CP violation, octant, and mass hierarchy sensitivities, in the DUNE experiment. We have also studied the effects of this torsional quartic interaction on atmospheric neutrino oscillation and also investigated how the MSW and parametric resonance energy and baseline change in presence of this interaction.
