Diffuse flux of PeV neutrinos from centrifugally accelerated protons in
  active galactic nuclei
  Evidence for high-energy astrophysical PeV neutrinos has been found in the
IceCube experiment from an analysis with a 7.5 year (2010 - 2017) data. Active
galactic nuclei (AGN) are among the most prominent objects in the universe, and
are widely speculated to be emitters of ultra-high-energy (UHE) cosmic rays
with proton domination. Based on the standard two-step LLCD mechanism of
particle acceleration, a transformation of energy occurs from AGN's central
super-massive black hole (SMBH) rotation to high-energy protons. Protons can be
accelerated up to $\sim 0.1$ EeV energies and above, and might generate PeV
neutrinos in the energy range $1$--$10$~ PeV through plausible hadronic
interactions. The theoretically estimated revised extragalactic diffuse muon
neutrino flux employing the "luminosity-dependent density evolution (LDDE)"
model for the AGN luminosity function (LF) is found consistent with the IceCube
level if only a fraction, $6.56\%$ of the total bolometric luminosity (BL) of
AGN is being realizable to power the PeV neutrinos. In the $\Lambda$~CDM
cosmological framework with the LDDE modeled LF and photon index distribution,
about $5.18\%$ of the total BL is enough to power the IceCube neutrinos.
