Moduli Corrections to Gauge and Gravitational Couplings in four dimensional Superstrings

الأصل · EN

We study one-loop, moduli-dependent corrections to gauge and gravitational couplings in supersymmetric vacua of the heterotic string. By exploiting their relation to the integrability condition for the associated CP-odd couplings, we derive general expressions for them, both for (2,2) and (2,0) models, in terms of tree level four-point functions in the internal N=2 superconformal theory. The (2,2) case, in particular symmetric orbifolds, is discussed in detail.