ON THE FORMATION OF DARK-MATTER BALLS COMPOSED OF DEGENERATE, SELF-GRAVITATING NEUTRINOS

We propose a novel scenario for the formation and time evolution of da rk matter balls composed of degenerate, self-gravitating tau-neutrinos and antineutrinos. This model is based on the interplay of two compet ing processes: annihilation of the particle-antiparticle pairs via wea k interaction and spherical (Bondi) accretion of these particles. Our model can account for the formation of dark matter balls, which could play a role similar to that of supermassive (similar to 10(9) M-circle dot) black holes in active galactic nuclei if the neutrino mass is in the range 10-25 keV/c(2).