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Advances in High Energy Physics
Volume 2012, Article ID 260848, 39 pages
Review Article

Gauge-Higgs Unification Models in Six Dimensions with Extra Space and GUT Gauge Symmetry

1Department of Physics and Center for Mathematics and Theoretical Physics, National Central University, Chungli 32001, Taiwan
2Institute of Physics, Academia Sinica, Taipei 11529, Taiwan
3Physics Division, National Center for Theoretical Sciences, Hsinchu 30013, Taiwan
4Department of Physics, Saitama University, Shimo-Okubo, Sakura-ku, Saitama 355-8570, Japan

Received 28 September 2011; Revised 17 December 2011; Accepted 19 December 2011

Academic Editor: Masaki Yasue

Copyright © 2012 Cheng-Wei Chiang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


We review gauge-Higgs unification models based on gauge theories defined on six-dimensional spacetime with / topology in the extra spatial dimensions. Nontrivial boundary conditions are imposed on the extra / space. This review considers two scenarios for constructing a four-dimensional theory from the six-dimensional model. One scheme utilizes the SO(12) gauge symmetry with a special symmetry condition imposed on the gauge field, whereas the other employs the E6 gauge symmetry without requiring the additional symmetry condition. Both models lead to a standard model-like gauge theory with the symmetry and SM fermions in four dimensions. The Higgs sector of the model is also analyzed. The electroweak symmetry breaking can be realized, and the weak gauge boson and Higgs boson masses are obtained.