X iv : h ep - t h / 95 04 12 9 v 1 2 5 A pr 1 99 5 Moduli Dependence of One – Loop Gauge Couplings
نویسنده
چکیده
We derive the moduli dependence of the one–loop gauge couplings for non– vanishing gauge background fields in a four–dimensional heterotic (0,2) string com-pactification. Remarkably, these functions turn out to have a representation as modular functions on an auxiliary Riemann surface on appropriate truncations of the full moduli space. In particular, a certain kind of one–loop functions is given by the free energy of two–dimensional solitons on this surface. * Supported by the " Sonderforschungsbereich 375–95 für Astro–Teilchenphysik " of the Deutsche Forschungsgemeinschaft and the EEC under contract no. SC1–CT92–0789.
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