CP-Violating solitons in the early universe Page: 3 of 9
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FERMILAB-Conf-97/ 179-A
astro-ph/9706271
CP-Violating Solitons in the Early Universe*
Ola T6rnkvistt and Antonio Riotto,
NASA/Fermilab Astrophysics Center,
Fermi National Accelerator Laboratory,
Batavia, Illinois 60510-0500, USA
June 4, 1997
Abstract
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 prelim-
inary 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.
*Talk given by O. T. at the conference "Fundamental Physics at the Birth of the Universe, II"
in Rome, Italy, 19-24 May 1997; contribution to the proceedings.
'Address after 24 Sept. 1997: DAMTP, Univ. of Cambridge, Silver Street, Cambridge
CB3 9EW, England. Email: olat@fnal.gov
PPARC Advanced Fellow, Oxford Univ. from Sept. 1997. From 1 Dec. 1997 on leave of ab-
sence at CERN, Theory Division, CH-1211 Geneva 23, Switzerland. Email: riotto@fnal.gov
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Tornkvist, O. & Riotto, A. CP-Violating solitons in the early universe, article, July 1, 1997; Batavia, Illinois. (https://digital.library.unt.edu/ark:/67531/metadc696549/m1/3/: accessed April 23, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.