title: Nonlocal symmetry breaking in Kaluza-Klein theories.
abstract: 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.
authors.affiliation: ISAS-SISSA, Via Beirut 2-4, I-34013 Trieste, Italy.
authors.forename: A
authors.initials: A
authors.lastname: Masiero
authors.forename: M
authors.initials: M
authors.lastname: Serone
authors.forename: C A
authors.initials: CA
authors.lastname: Scrucca
authors.forename: L
authors.initials: L
authors.lastname: Silvestrini