Efficiency of Centrifugal Mechanism in Producing PeV Neutrinos From
  Active Galactic Nuclei
  A several-step theoretical model is constructed to trace the origin of ultra
high energy (UHE) $[1-2]$PeV neutrinos detected, recently, by the IceCube
collaboration. Protons in the AGN magnetosphere, experiencing different
gravitational centrifugal force, provide free energy for the parametric
excitation of Langmuir waves via a generalized two-stream instability. Landau
damping of these waves, outside the AGN magnetosphere, can accelerate protons
to ultra high energies. The ultimate source for this mechanism, the
Langmuir-Landau-Centrifugal-Drive (LLCD), is the gravitational energy of the
compact object. The LLCD generated UHE protons provide the essential ingredient
in the creation of UHE neutrinos via appropriate hadronic reactions; protons of
energy~ $10^{17}$eV can be generated in the plasmas surrounding AGN with
bolometric luminosities of the order of $10^{43}$ergs s$^{-1}$. By estimating
the diffusive energy flux of extragalactic neutrinos in the energy interval
$[1-2]$PeV, we find that an acceptably small fraction $0.003\%$ of the total
bolometric luminosity will suffice to create the observed fluxes of
extragalactic ultra-high energy neutrinos.
