Speaker
Description
Lorentz Invariance Violation may arise in several approaches of Quantum Gravity theories, where microscopic space-time fluctuations can induce modified dispersion relations, causing energetic particles to propagate at different effective velocities. Neutrinos are particularly well-suited particles to probe such effects due to their tiny masses, weak interactions, and ability to propagate coherently over macroscopic and astrophysical distances.
In this work, we investigate how QG-induced fluctuations and LIV effects can impact neutrino coherence, modifying the standard oscillation framework. We propose an effective neutrino coherence length that incorporates QG induced decoherence effects, beyond the conventional wave-packet separation mechanism. Analytical expressions for the modified coherence length are derived, and their dependence on neutrino energy and on the parameters characterizing the quantum-gravity–motivated modified dispersion relation is analyzed. We apply this framework to simulations of neutrinos emitted from core-collapse supernovae, where galactic-scale propagation distances enhance sensitivity to coherence-loss effects.
We discuss the phenomenological implications of these results for supernova neutrino observations as well as for long-baseline neutrino oscillation experiments employing large-mass liquid argon detectors, highlighting their potential to constrain LIV and QG-inspired scenarios through deviations from the standard oscillation pattern.
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