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Effects of baryon-antibaryon annihilation in the evolution of antimatter domains in baryon asymmetrical Universe
1, 2, 3 , * 4
1  Universit√© de Paris 7, CNRS, Astroparticule et Cosmologie, Paris, France
2  Institute of Physics, Southern Federal University, Rostov on Don, Russia
3  National Research Nuclear University "MEPHI", Moscow, Russia
4  Sapienza University of Rome

Published: 22 February 2021 by MDPI in 1st Electronic Conference on Universe session The Universe of Andrei Sakharov

The mechanisms of baryosynthesis, which involve the three Sakharov's conditions, admit a possibility of nonhomogeneous generation of baryon excess. It may take place in the case of spatial variation of CP violating phase or of the baryon generating field in the early Universe. In the extreme case this nonhomogeneity can lead to the change of sign of baryon excess and formation of antibaryon domains in baryon asymmetrical Universe. Surrounded by the baryon matter, evolution of antibaryon domains is strongly influenced by effect of baryon and antibaryon diffusion to the border of domain and their annihilation. It leads to change of size of domains and antibaryon density in them. The consequence of antibaryon-baryon annihilation at the border of antimatter domains in baryon-asymmetrical Universe is investigated. The successive evolution in the expanding Universe strongly depends on antibaryon density within domain. At low density it is not sufficient to provide separation from cosmological expansion. Such separation can, however, be provided by effects of dark matter, which we briefly discuss. Low-density antimatter domains are further classified with the account for the border interactions. Differently, a similar classification scheme is also proposed for higher-densities antimatter domains. Antimatter domains containing antiprotons and different types of antinuclei are also analyzed within the framework of non-trivial baryosynthesis processes. The antiproton-proton annihilation interactions are therefore schematized and evaluated. The effects of antinuclei-nuclei-interaction-patterns are investigated and taken into account in the analysis of antimatter domain evolution.

Keywords: Classical general relativity: fundamental problems and general formalism; Classical general relativity: exact solutions; antibaryons.