Abstract
We study instanton effects in theories with compact extra
dimensions. We perform an instanton calculation in a 5d theory on a
circle of radius R, with gauge, scalar, and fermion fields in the
bulk of the extra dimension. We show that, depending on the matter
content, instantons of size ρ << R can dominate the amplitude.
Using deconstruction as an ultraviolet definition of the theory allows
us to show, in a controlled approximation, that for a small number of
bulk fermions, the amplitude for small size instantons exponentially
grows as e
(1)R/ρ.
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