Antiprotons Annihilation in the Galaxy As A Source of Diffuse Gamma   Background
  The existence of antimatter domains in baryon asymmetrical Universe can appear as the cosmological consequence of particle theory in inflationary models with non-homogeneous baryosynthesis. Such a domain can survive in the early Universe and form globular cluster of antimatter stars in our Galaxy. The model of antimatter pollution of Galaxy and annihilation with matter gas is developed. The proton-antiproton annihilation gamma flux is shown to reproduce the observed galactic gamma background measured by EGRET. From comparison with observational data the estimation on the maximally allowed amount of antimatter stars, possibly present in our Galaxy, is found. 
Yu.A. Golubkov (1), M.Yu. Khlopov (2) ((1) Institute of Nuclear   Physics, Moscow State University (2) Center for CosmoParti...