Late baryogenesis in superstring models

Details Late baryogenesis in superstring models Late baryogenesis in superstring models

Mar 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987phlb..186..303m&link_type=abstract

Physics Letters B, Volume 186, Issue 3-4, p. 303-308.

Physics

20

Scientific paper

The possible generation of cosmological matter-antimatter asymmetry in superstring models with an intermediate mass scale via the baryon-violating decays of the higgsino with the same quantum numbers as the right-handed neutrino is analyzed. Under certain circumstances, which imply an upper bound on the g-quark mass of order 108 GeV, the baryogenesis occurs in the late stage in the evolution of the universe, thereby avoiding any possible dilution effects arising after the electroweak phase transition epoch. The simplest model that can lead to sizeable baryon-to-entropy ratiorequires additional symmetries to prevent rapid proton decay and suggests observable neutron-antineutron oscillation.
Work supported by sabbatical year award from the Spanish Ministry of Science.
Departamento de Física Téorica, Facultad de Ciencias Físicas,Universitat de Valencia, Burjasot (Valencia), Spain

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