Abstract
We compute coupling constants for the emission of untwisted states within the class of even dimensional, bosonic orbifolds. In order to apply the operator formalism we first have to construct the untwisted and twisted sector cocycle operators which complete the zero mode part of vertex operators. Their existence is guaranteed by a consistency condition on the axionic background whose general solution will be determined. These results enable us to study various discrete background maps (duality, shifts of axionic components) which reshuffle the vertices. We then recognize that the process of the emission of strings from whichever twisted sector provides a modular invariant.
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