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In the context of the Einstein-Cartan-Dirac model, where the torsion of thespace-time couples to the axial currents of the fermions, we study the effectsof this quantum-gravitational interaction on a massless neutrino beam crossingthrough a medium with high number density of fermions at rest. We calculate thereflection amplitude and show that a specific fraction of the incidentneutrinos reflects from this potential if the polarization of the medium isdifferent from zero. We also discuss the order of magnitude of the fermionicnumber density in which this phenomenon is observable, in other theoreticalcontexts, for example the strong-gravity regime and the effective field theoryapproach.Comment: 8 pages, LaTe

QUANTUM REFLECTION OF MASSLESS NEUTRINOS FROM A TORSION-INDUCED POTENTIAL