Nonlocal symmetry breaking in Kaluza-Klein theories.
Scherk-Schwarz gauge symmetry breaking of a D-dimensional field theory model compactified on a circle is analyzed. It is explicitly shown that forbidden couplings in the unbroken theory appear in the one-loop effective action only in a nonlocal way, implying that they are finite at all orders in perturbation theory. This result can be understood as a consequence of the local gauge symmetry, but it holds true also in the global limit.
Masiero
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ISAS-SISSA, Via Beirut 2-4, I-34013 Trieste, Italy.
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Scrucca
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Silvestrini
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