arXiv subjects

Simone Monda

Publications and source records attributed to Simone Monda.

4 recordsLinked to original sources

arXiv2026

Spin-dependent neutrino oscillations in torsion backgrounds: A quantum-field-theoretic analysis

We study neutrino mixing in a background with spacetime torsion within the quantum-field-theoretic formulation of flavor oscillations. Working in the Einstein--Cartan framework and neglecting curvature, we quantize Dirac fields in constant and linearly time-dependent axial-torsion backgrounds. A constant spatial torsion component lifts the degeneracy between the two spin orientations through spin-dependent effective masses and energies. In quantum field theory this splitting modifies not only the oscillation frequencies but also the amplitudes, because the Bogoliubov coefficients entering the flavor operators depend on spin. The effect is largest at low momentum when the torsion scale is comparable to the neutrino masses, while a dominant torsion term suppresses the relative mass splittings and can inhibit flavor conversion. We also discuss the induced spin dependence of the Dirac $CP$ asymmetry and of the condensate densities in the flavor vacuum. The results identify nonrelativistic neutrinos as the natural regime in which the difference between the field-theoretic and quantum-mechanical descriptions is most pronounced.

hep-ph↗

arXiv2025

Quantized Dirac Fields in torsionful gravity: cosmological implications and links with the dark universe

We consider a classical field in square torsion theory as a source of torsion for a quantum fermion field in FLRW metric. In the framework of QFT, we obtain vacuum contributions to the energy-momentum tensor and to the axial current that modify the dynamics of the classical field and the field equations as back-reaction. These contributions lead to a modified classical field and therefore to a modified torsion term $L^\mu$ and expectation value of energy-momentum tensor $T^{\mu\nu}$ on the quantum vacuum, altering the field equations in an interative process. We consider the first step of this process and we find that the vacuum condensate could affect the inflationary phase of the Universe. Higher order terms could impact the dark Universe.

hep-th↗

arXiv2025

Dark matter induced by neutrino mixing and flavor vacuum condensate probed by neutrino capture on tritium

We show that experiments designed to capture low energy neutrinos, like PTOLEMY are sensitive to the specific neutrino model. In particular, they might show a signature of the condensed flavor vacuum, featured in the flavor Fock space model, and allow to test the hypothesis according to which a possible dark matter component is determined by neutrino mixing.

hep-ph↗

arXiv2023

Quantum Field Theory of neutrino mixing in spacetimes with torsion

In the framework of quantum field theory, we analyze the neutrino oscillations in the presence of a torsion background. We consider the Einstein-Cartan theory and we study the cases of constant torsion and of linearly time dependent torsion. We derive new neutrino oscillation formulae which are depending on the spin orientation. Indeed the energy splitting induced by the torsion influences oscillation amplitudes and frequencies. This effect is maximal for values of torsion of the same order of the neutrino masses and for very low momenta, and disappears for large values of torsion. Moreover, neutrino oscillation is inhibited for intensities of torsion term much larger than neutrino masses and momentum. The modifications induced by torsion on the $CP$-asymmetry has been also presented. Future experiments, such as PTOLEMY, could provide insights into the effect shown here.

hep-ph↗