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We discuss the importance of flavor ratio measurements in neutrinotelescopes, such as by measuring the ratio between muon tracks to cascades, forthe purpose of extracting new physics signals encountered by astrophysicalneutrinos during propagation from the source to the detector. The detectedflavor ratios not only carry the energy information of specific new physicsscenarios which alter the transition probabilities in distinctive ways, butalso the energy dependent flavor composition at the source. In the presentwork, we discuss the interplay of these two energy dependent effects andidentify which new physics scenarios can be distinguished from the detectedflavor ratios as a function of astrophysical parameters. We use a recentlydeveloped self-consistent neutrino production model as our toy model togenerate energy dependent source flavor ratios and discuss (invisible) neutrinodecay and quantum decoherence as specific new physics examples. Furthermore, weidentify potentially interesting classes of sources on the Hillas plot for thepurpose of new physics searches. We find that sources with substantial magneticfields 10^3 Gauss <= B <= 10^6 Gauss, such as Active Galactic Nuclei (AGN)cores, white dwarfs, or maybe gamma-ray bursts, have, in principle, the bestdiscrimination power for the considered new physics scenarios, whereas AGNjets, which typically perform as pion beam sources, can only discriminate fewsub cases in the new physics effects. The optimal parameter region somewhatdepends on the class of new physics effect considered.

Interplay of energy dependent astrophysical neutrino flavor ratios and new physics effects