Speaker
Description
Spacetime torsion provides a natural bridge between spin, gravity and quantum fields, and may leave observable imprints in fermionic sectors relevant to cosmology. I will discuss recent results on neutrino mixing in torsionful spacetimes within a quantum-field-theoretical framework, focusing on the phenomenological aspects most directly connected with relativistic astrophysics, quantum gravity and the dark Universe.
In the Einstein–Cartan framework, both constant and linearly time-dependent torsion backgrounds modify the energy spectrum of mixed neutrinos. This leads to spin-orientation-dependent oscillation formulae, shifts in oscillation amplitudes and frequencies and corrections to CP-asymmetry. These effects become especially relevant when the torsion scale is comparable to neutrino masses and in the very-low-momentum regime, suggesting relic or non-relativistic neutrinos as promising probes of torsion-induced physics.
I will then connect these microscopic signatures with broader cosmological questions, discussing how torsionful fermionic vacua and flavor condensates may affect the energy-momentum tensor, back-reaction mechanisms and possible dark-sector phenomenology. Finally, I will outline potential indirect tests through future low-energy neutrino-capture experiments, such as PTOLEMY and argue that torsion-induced modifications of neutrino mixing can provide a complementary window on physics beyond standard general relativity.