Abstract
Fractional D6-branes on toroidal orbifold backgrounds are known to be able to accommodate the particle spectrum and gauge group of the Standard Model, but up to now exact results for their low-energy effective action are missing. Here we discuss how the conceptual ansatz of matching the string theoretic gauge couplings at one-loop with the supergravity expressions is generalised from the six-torus to orbifold backgrounds on which the Standard Model spectrum can be realised on fractional D6-branes. The Kahler metrics and perturbatively exact holomorphic gauge kinetic functions can be classified in terms of the vanishing of some i ntersection angle and the related beta function coefficients, which potentially opens the possibi lity to extrapolate to smooth Calabi-Yau backgrounds.
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