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The hypothesis that dark matter is converted into visible particles in activegalactic nuclei is investigated. If dark matter consists of stable superheavyneutral particles and active galactic nuclei are rotating black holes, then,due to the Penrose process, superheavy particles can decay into unstableparticles with larger mass, whose decay into quarks and leptons leads to eventsin cosmic rays observed by the Auger group. Similar processes of decay ofsuperheavy particles of dark matter into visible matter occurred in the earlyUniverse. Numerical estimates of the processes in active galactic nuclei and inthe early Universe are given.

Active Galactic Nuclei and Transformation of Dark Matter into Visible Matter