Light element abundances in a matter-antimatter model of the universe

Physics

Scientific paper

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Antimatter, Astronomical Models, Big Bang Cosmology, Light Elements, Matter (Physics), Abundance, Annihilation Reactions, Baryons, High Energy Interactions, Leptons, Nuclear Fusion, Photonuclear Reactions

Scientific paper

A baryon symmetric big bang cosmology is considered in which at the end of the leptonic era the universe is filled with a matter-antimatter emulsion characterized by an entropy per baryon already of the order of the presently observed value, so that no catastropic annihilation can take place at a later time. Two mechanisms for deuterium production are examined: (1) the nucleodisruption process, which can lead to an appreciable amount of deuterium as soon as the temperature is smaller than 0.07 MeV, and (2) disintegration by gamma rays produced in proton-antiproton annihilation. These mechanisms are considered in connection with an evolution according to the scenario of Omnes (1972), and they are shown to lead to greater abundances in He-3 and D than those computed in normal big-bang cosmology if He-4 has been normally produced. The present calculations provide a test for a large class of matter-antimatter models.

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