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Heterotic-type II duality in twistor space

Abstract : Heterotic string theory compactified on a K3 surface times T^2 is believed to be equivalent to type II string theory on a suitable Calabi-Yau threefold. In particular, it must share the same hypermultiplet moduli space. Building on the known twistorial description on the type II side, and on recent progress on the map between type II and heterotic moduli in the 'double scaling' limit (where both the type II and heterotic strings become classical), we provide a new twistorial construction of the hypermultiplet moduli space in this limit which is adapted to the symmetries of the heterotic string. We also take steps towards understanding the twistorial description for heterotic worldsheet instanton corrections away from the double scaling limit. As a spin-off, we obtain a twistorial description of a class of automorphic forms of SO(4,n,Z) obtained by Borcherds' lift.
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Sergey Alexandrov, Boris Pioline. Heterotic-type II duality in twistor space. Journal of High Energy Physics, Springer, 2013, pp.85. ⟨10.1007/JHEP03(2013)085⟩. ⟨hal-00741850⟩

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