Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1993-11-12
Phys.Rev. D49 (1994) 3881-3885
Physics
High Energy Physics
High Energy Physics - Phenomenology
12 pages plus 1 Postscript figure available upon request. LBL 34827
Scientific paper
10.1103/PhysRevD.49.3881
Stringent bounds on baryon and lepton number violating interactions have been derived from the requirement that such interactions, together with electroweak instantons, do not destroy a cosmological baryon asymmetry produced at an extremely high temperature in the big bang. While these bounds apply in specific models, we find that they are generically evaded. In particular, the only requirement for a theory to avoid these bounds is that it contain charged particles which, during a certain cosmological epoch, carry a non-zero hypercharge asymmetry. Hypercharge neutrality of the universe then dictates that the remaining particles must carry a compensating hypercharge density, which is necessarily shared amongst them so as to give a baryon asymmetry. Hence the generation of a hypercharge density in a sector of the theory forces the universe to have a baryon asymmetry.
Antaramian Aram
Hall Lawrence J.
Rasin Andrija
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