Speaker
Description
Quantum gravity theories often predict spacetime fluctuations at the Planck scale, which could induce observable quantum decoherence effects. Neutrinos provide a uniquely sensitive probe of such phenomena: because they interact only via the weak force and gravity, they can maintain quantum coherence over astrophysical distances. In this talk, I will present a search for quantum decoherence using 10.7 years of neutrino data collected by the IceCube Neutrino Observatory. By examining the persistence of neutrino coherence across large baselines, we test models of quantum-gravity-induced decoherence with energy-dependent scaling. Our results significantly strengthen existing constraints and exclude minimal Planck-suppressed decoherence scenarios across a broad range of energy scalings. These findings place some of the most stringent limits to date on quantum gravity–induced decoherence and highlight the power of neutrino observatories as probes of fundamental physics.
