CHINESE JOURNAL OF PHYSICS VOL. 40, NO. 3 JUNE 2002

Neutrino Spin-Flip Effects in Active Galactic Nuclei

M. Anwar Mughal¹ and H. Athar<sup>2*

1</sup>Department of Physics, Quaid-i-Azam University, Islamabad 45320, Pakistan
²Physics Division, National Center for Theoretical Sciences, Hsinchu, Taiwan 300, R.O.C.

and

Institute of Physics, National Chiao-Tung University, Hsinchu, Taiwan 300, R.O.C.
(Received November 20, 2001)

We study the effects of neutrino spin-flips in the magnetic field, B_AGN, of an active galactic nuclei (AGN) for high-energy neutrinos ($E\geq 10^{6}$ GeV) originating from the AGN, induced by an interplay of a violation of the equivalence principle parameterized by $\Delta f$ and the twist in B_AGN. We point out that a conversion effect may exist for $\Delta f \sim 10^{-34}(\delta m^{2}/10^{-5}~\mbox{eV}^{2})$ independent of the gravity mixing angle. Observational consequences for this conversion effect are discussed.

PACS. 95.85.Ry - Neutrino, muon, pion, and other elementary particles; cosmic rays.
PACS. 98.54.Cm - Active and peculiar galaxies.
PACS. 14.60.Pq - Neutrino mass and mixing.

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