Neutrino Oscillations and Lorentz Invariance Violation

TL;DR

This paper investigates how potential violations of Lorentz invariance could affect neutrino oscillations, offering a way to detect new physics related to the quantum structure of spacetime.

Contribution

It analyzes the impact of Lorentz invariance violation on neutrino oscillation patterns and mass hierarchy detection, providing a novel approach to explore quantum spacetime effects.

Findings

LIV can alter neutrino oscillation patterns

Neutrino oscillations can serve as probes for quantum spacetime effects

Potential modifications to neutrino mass hierarchy detection

Abstract

This work explores the possibility of resorting to neutrino phenomenology to detect evidence of new physics, caused by the residual signals of the supposed quantum structure of spacetime. In particular, this work investigates the effects on neutrino oscillations and mass hierarchy detection, predicted by models that violate Lorentz invariance, preserving the spacetime isotropy and homogeneity. Neutrino physics is the ideal environment where conducting the search for new "exotic" physics, since the oscillation phenomenon is not included in the original formulation of the minimal Standard Model (SM) of particles. The confirmed observation of the neutrino oscillation phenomenon is, therefore, the first example of physics beyond the SM and can indicate the necessity to resort to new theoretical models. In this work, the hypothesis that the supposed Lorentz Invariance Violation (LIV) perturbations can influence the oscillation pattern is investigated. LIV theories are indeed constructed assuming modified kinematics, caused by the interaction of massive particles with the spacetime background. This means that the dispersion relations are modified, so it appears natural to search for effects caused by LIV in physical phenomena governed by masses, as in the case of neutrino oscillations. In addition, the neutrino oscillation phenomenon is interesting since there are three different mass eigenstates and in a LIV scenario, which preserves isotropy, at least two different species of particle must interact.