Higher-derivative couplings in string theory: Dualities and the B field Original Research Article

The first quantum correction to the IIA string effective action arises at the eight-derivative level and takes the schematic form image. This correction, however, cannot be complete by itself, as it is neither supersymmetric nor T-duality covariant. We reexamine these eight-derivative couplings and conjecture that the simple replacement image, where image is the connection with torsion, nearly completely captures their dependence on the B field. The exception is in the odd–odd spin structure sector, where additional terms are needed. We present here a complete result at the level of the five-point function and a partial one for the six-point function. Further evidence for this conjecture comes from considering T-duality as well as heterotic/IIA duality beyond leading order. Finally, we discuss the eleven-dimensional lift of the modified one-loop type IIA couplings.