Seminarium "Teoria cząstek elementarnych i kosmologia"

The identities and sources of extremely energetic cosmic rays (EECR) with E > 50-100 EeV remains a mystery. Situation is paradoxical because there are many controversies in the EECR observations by different experiments. I propose a possibility to explain all these tensions suggesting that the dark matter of the universe is represented by a parallel mirror sector of particles, ordinary and mirror neutrinos and neutrons have a mixing, and characteristic time of n-n' oscillation is smaller than the neutron decay time (this is not excluded neither by the present experiments nor by the astrophysical bounds). I shortly discuss also some other phenomenological and cosmological implications of this scenario.