CP Violating Solitons in the Early Universe

Details CP Violating Solitons in the Early Universe CP Violating Solitons in the Early Universe

1997-06-26

arxiv.org/abs/astro-ph/9706271v2

Astronomy and Astrophysics

Astrophysics

Talk given by Ola Tornkvist, to appear in the proceedings of Fundamental Physics at the Birth of the Universe, II, in Rome, It

Scientific paper

Solitons in extensions of the Standard Model can serve as localized sources of CP violation. Depending on their stability properties, they may serve either to create or to deplete the baryon asymmetry. The conditions for existence of a particular soliton candidate, the membrane solution of the two-Higgs model, are presented. In the generic case, investigated by Bachas and Tomaras, membranes exist and are metastable for a wide range of parameters. For the more viable supersymmetric case, it is shown that the present-day existence of CP-violating membranes is experimentally excluded, but preliminary studies suggest that they may have existed in the early universe soon after the electroweak phase transition, with important consequences for the baryon asymmetry of the universe.

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