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SLAC-PUB-7964
Possible Origin of Fermion Chirality and Gut Structure From Extra Dimensions

Abstract

The fundamental chiral nature of the observed quarks and leptons and the emergence of the gauge group itself are most puzzling aspects of the standard model. Starting from general considerations of topological properties of gauge field configurations in higher space- time dimensions, it is shown that the existence of non-trivial structures in ten dimensions would determine a class of models corresponding to a grand unified GUT structure with complex fermion representations with respect to SU(3)C × SU(2)L × U(1)Y. The discussion is carried out within the framework of string theories with characteristic energy scales below the Planck mass. Avoidance of topological obstructions upon continuous deformation of field configurations leads to global chiral symmetry breaking of the underlying fundamental theory, imposes rigorous restrictions on the structure of the vacuum and space-time itself and determines uniquely the gauge structure and matter content.

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1) The present version of SLAC-PUB-7964 was revised in July 1999 from the original version published at SLAC in October 1998.

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