Abstract
We discuss higher order terms in the effective actions of 10-dimensional SO(32) heterotic and type I superstrings from the point of view of duality between the two theories. Some of these terms do not receive higher-loop corrections being related by supersymmetry to ‘anomaly-cancelling’ terms, while others (like R4 tree-level super-invariant) should be multiplied by a non-trivial function of the dilaton in order for the duality conjecture to be consistent.
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