Physics
Scientific paper
Nov 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997phdt........13r&link_type=abstract
Thesis (PHD). UNIVERSITY OF CALIFORNIA, RIVERSIDE , Source DAI-B 58/05, p. 2488, Nov 1997, 81 pages.
Physics
3
Active Galactic Nuclei
Scientific paper
Neutrino oscillations in the presence of strong gravitational fields are studied considering Dirac and Majorana neutrinos. We look at very high energy neutrinos (~1 TeV) emanating from Active Galactic Nuclei (AGN). It is observed that spin flavor resonant transitions of such neutrinos may occur in the vicinity of AGN due to gravitational effects and the presence of a large magnetic field (~1 Tesla) dominating over matter induced oscillations. Such oscillations occur at energies in the PeV range for magnetic moments in the 10-17μB range. Probabilities are calculated and we predict significant increase of Tau neutrino flux to which future neutrino telescopes will be sensitive. The violation of the equivalence principle (VEP) causing neutrino oscillations is of current interest. We have studied also the the possibility of spin flavor oscillation of such ultra high energy neutrinos due to VEP and due to the presence of a large magnetic field in AGN. In particular we look at the resonance spin flavor conversion driven by the AGN potential. Interesting bounds on the transition magnetic moment of neutrinos may therefore be obtained. The search for such high energy neutrinos by the neutrino telescopes (e.g. AMANDA, BAIKAL, km3 etc.) which are under construction necessitates a clear picture of the expected neutrino fluxes from these objects. That is the main motivation behind this study.
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