Antiproton annihilation in the galaxy as a source of diffuse γ background

Abstract

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.

511 keV Photons from Color Superconducting Dark Matter

“…Estimated in such a way flux is definitely not in immediate contradiction with observations, where some access of γ rays indeed has been observed by EGRET. We should add that the observed access has been interpreted in [24], [25] as due to the dark matter annihilation, and in [26] as due to pp annihilation. One more phenomenological consequence of the suggested scenario is that baryon-antibaryon annihilation which always accompany 511KeV line eventually may be responsible for a "non observation" of the cusp behavior near the Galactic Center.…”

Cosmoparticle physics: The universe as a laboratory of elementary particles

“…The existence of such cluster in the halo of our Galaxy should lead to the pollution of the galactic halo by antiprotons. Their annihilation can reproduce [64] the observed galactic gamma background in the range tens-hundreds MeV. The prediction of antihelium component of cosmic rays [65], accessible to future searches for cosmic ray antinuclei in PAMELA and AMS02 experiments, as well as of antimatter meteorites [66] provides the direct experimental test for this hypothesis.…”

Cosmological Reflection of Particle Symmetry

“…The existence of such clusters in the halo of our galaxy should lead to the pollution of the galactic halo by antiprotons. Their annihilation can reproduce [132] the observed galactic gamma background in the range of tens-hundreds MeV. The prediction of an antihelium component of cosmic rays [133]-accessible to future searches for cosmic ray antinuclei in PAMELA and AMS II experiments-as well as of antimatter meteorites [134] provides the direct experimental test for this hypothesis.…”