Neutrino flavor ratios from cosmic accelerators on the Hillas plot

Abstract

We discuss energy-dependent flavor and neutrino-antineutrino ratios of neutrinos produced in cosmic accelerators as a function of energy over 20 × 24 orders of magnitude in R and B , which are the parameters of the Hillas plot. We use a self-consistent model for sources optically thin to neutrons, in which the neutrinos come from charged pions produced in photohadronic interactions of protons. The target photon field is assumed to be synchrotron photons from co-accelerated electrons or positrons. The description of the photohadronic interactions takes into account high energy interactions, which may lead to substantial π − production. Since synchrotron cooling processes are included, we re-cover the well-known pion beam, muon damped, and neutron beam sources in different regions of the Hillas plot, depending on the injection index, as well as we find sources with anomalous flavor ratios.