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

Diffuse flux of PeV neutrinos from centrifugally accelerated protons in active galactic nuclei