New Ideas in Symmetry Breaking
arXiv:hep-ph/0302189
Abstract
Some old and new ideas on symmetry breaking, based on the presence of extra dimensions that have been the subject of a very fast development and intensive studies during the last years, will be presented in these lectures. Special attention will be devoted to the various compactification mechanisms, including toroidal and orbifold compactifications, and to non-trivial boundary conditions or Scherk-Schwarz compactification. Also symmetry breaking by Wilson lines, or Hosotani breaking characteristic of non-simply connected compact manifolds will be analyzed in some detail. The different mechanisms will be applied to the breaking of the most relevant symmetries in particle physics: supersymmetry and gauge symmetry. The required background for these lectures is Quantum Field Theory, Supersymmetry and some rudiments of Kaluza-Klein theory. The different sections will be illustrated with examples.
46 pages, 5 eps figures, axodraw. Based on lectures given at TASI-02, University of Colorado, CO, USA, from June 3-28, 2002, and at SI2002, Fuji Yoshida, Japan, from August 13-20, 2002. v2: references added. v3: latex typo corrected
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