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The flavor of cosmic neutrinos may help unveil their sources and could revealthe presence of new physics in the neutrino sector. We consider the impacts ofnext-generation neutrino detectors, including the planned upgrade to neutrinodetector--IceCube-Gen2, which is well-positioned to make dramatic improvementsin both flavor and spectral measurements. We show that various models inneutrino physics beyond the Standard Model, such as neutrino decay,pseudo-Dirac states, and neutrino self-scattering, may be found or stronglyconstrained at IceCube-Gen2 and KM3NeT. We find that the additional flavordiscriminants given by Glashow resonance events and so-called "double-bang"topologies improve the ability to access the flavor of the cosmic high-energyneutrinos and probe the BSM physics. In addition, although the details dependon source properties, Glashow resonance events have the additional feature ofbeing able to inform us of the relative strengths of neutrino and antineutrinoemission, which may help us discriminate astrophysical scenarios.

Probing BSM Neutrino Physics with Flavor and Spectral Distortions: Prospects for Future High-Energy Neutrino Telescopes