The interaction of ultra-high-energy (UHE) cosmic rays with baryonic matter in the Milky Way produces hadrons which ultimately decay into neutrinos. This mnstitutes a backp u n d for neutrino t e l e s m p attempting to discover UHE neutrino point sources in the sky. We give an estimate of this backpund. If there exists a galactic halo of -ONC dark matter, one may be able to use the technique of registering the galactic neutrino backsound to detennine ita distribution.
In some composite models of quarks and leptons, leptons are expected to develop strong interactions at high energies. This hypothesis can be tested by studying the absorption of high-energy particles emitted by point sources in the sky on the cosmic microwave background. Data on Cygnus X-3 exhibit an anomaly in the absorption. A plausible interpretation of the anomaly is that some of the interactions are caused by neutrinos. We infer that the cross section of neutrino-nucleon interactions is approximately 6 mb at energies of a few PeV, significantly exceeding the prediction of the standard model. PACS numbers: 98.60.Df, 12.50.Ch, 13.15.Em, 97.80.Jp 844
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