On possible sources of heavy neutral particles in cosmic rays

We explore some possible mechanisms by which the heavy neutral cosmic parti cles are accelerated to gain sufficiently high kinetic energies and cause o bservable effects at detectors on the earth. Our results indicate that all the known sources which are based on the established theories and observati ons fail to give rise to very high energy with sizable flux intensity. If t he heavy neutral particles of kinetic energies of GeV order indeed exist in cosmic rays, there must be certain mechanisms beyond our present knowledge of dark matter and universe evolution.