We explicitly extract the structure of higher-derivative curvature-squared terms at genus 0 and 1 in the d = 4 heterotic string effective action compactified on symmetric orbifolds by computing on-shell S-matrix superstring amplitudes. In particular, this is done within the context of calculating the graviton 4-point amplitude. We also discuss the modulidependent gravitational threshold corrections to the coupling associated with the CP even quadratic curvature terms.
CITATION STYLE
Förger, K., Ovrut, B. A., Theisen, S. J., & Waldram, D. (1996). Higher-derivative gravity in string theory. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 388(3), 512–520. https://doi.org/10.1016/S0370-2693(96)01175-6
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