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Résumé |
High-energy astrophysical neutrinos, recently discovered by IceCube, are fertile ground to test for the presence of new physics. We can look for it at previously unexplored energies -- from tens of TeV to a few PeV,
far beyond the reach of laboratory experiments. Due to cosmological-scale baselines -- Mpc to Gpc -- tiny new physics effects, otherwise unobservable, could, by accumulation, become detectable. These
include, for instance, neutrino decay, violation of fundamental
symmetries, and novel neutrino-neutrino interactions. I will show that
the spectral features and flavor composition of neutrinos can reveal the
presence and type of new physics. Present-day data are already
sensitive to some models. More statistics, improvements in detection
techniques, and detector upgrades will only enhance the sensitivity. |
