On Nucleon-Antinucleon Symmetry in Cosmology

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Science  17 Oct 1958:
Vol. 128, Issue 3329, pp. 904
DOI: 10.1126/science.128.3329.904


It has been suggested that cosmological models should embody an initial nucleon-antinucleon symmetry and that the present ratio of nucleons to antinucleons is the result of a statistical fluctuation. Simple arguments are presented for evolutionary models which appear to rule out this possibility in the development of the universe.