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Baryon Symmetric Big Bang Cosmology

Published online by Cambridge University Press:  07 February 2017

R. Omnès  and
J. L. Puget
R. Omnès
Affiliation:
Laboratoire Physique Théorique et hautes énergies, Université de Paris Sud, 91405 Orsay, France
J. L. Puget
Affiliation:
Départment d'Astrophysique Fondamentale, Observatoire de Meudon, 92190 Meudon, France

Extract

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In a big bang cosmology in which the Universe is initially filled with thermal radiation at a very high temperature the number of nucleon-antinucleon pairs decreases exponentially with temperature when the latter falls below a value such that kT ~ 1 GeV. To explain the observed ratio η = N/Nph ~ 10-9 where N is the average baryon density and Nph the photon density, nucleons and antinucleons must have been separated in the thermal radiation at a temperature greater than 30 MeV. A mechanism has been suggested which would lead to a phase transition in thermal radiation for kT > 300 MeV resulting in two phases with opposite non zero baryon number. The interaction between nucleons and antinucleons at intermediate energy is repulsive according to the mesonic theory of nuclear forces. This can be checked experimentally by measuring with enough precision the energy of X-rays emitted by the protonium atom and this experiment is now under way at CERN. Different models have been made to investigate their consequences and in each case a phase transition has been found above a temperature of the order of 300 MeV (Omnes, 1972; Aldrovandi and Caser, 1973; Cisneros, 1973).

Type
Part VI: Matter-Antimatter Universes and Physical Processes Near the Singularity
Information
Symposium - International Astronomical Union , Volume 63: Confrontation of Cosmological Theories , 1974 , pp. 335 - 339
Copyright
Copyright © Reidel 1974 

References

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