Nonstandard neutrino properties and the high-energy cosmic neutrino flux -art. no. 067302

Recently, it has been shown that cosmic neutrino flux at the gamma ray burs ter/active galactic nuclei source. F-nu e(0):F-nu mu(0):F(nu tau)(0)similar or equal to1:2:0, inevitably oscillates (in the three neutrino framework) to 1:1:1, irrespective of the mixing angle relevant to the solar data. It h as also been pointed out that the intrinsic flux of the cosmic high-energy neutrinos may not have the standard ratio, in which case the cosmic neutrin o flux in the far distance should be dependent on the mixing angle, For neu trinos with nonzero electromagnetic properties, we show in the latter case that matter effects on oscillations of high-energy cosmic neutrinos can sub stantially modify the vacuum oscillation probability, if the mass-squared d ifference is less than or similar to 10(-10) eV,.