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Generalization of the R^4 Conjecture
Nathan Berkovits
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We propose SL(2,Z) (and SL(3,Z)) invariant conjectures for all
$R^4 H^{4g-4}$ couplings of Type IIB strings on $R^{10}$ (and
$R^8 x T^2$), generalizing conjectures of Green and Gutperle
(and Kiritsis and Pioline) for the $R^4$ coupling. A strong check for our
conjectures is that on $T^2$ at weak coupling, they reproduce the
multiloop scattering amplitudes which had been previously computed
using N=2 strings in the N=4 topological formalism.
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hep-th/9803145
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