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Physical Review D 83 (2011) 026001
On the topology of the hypermultiplet moduli space in type II/CY string vacua
Sergei Alexandrov1, Daniel Persson, Boris Pioline2

By analyzing qualitative aspects of NS5-brane instanton corrections, we determine the topology of the hypermultiplet moduli space M_H in Calabi-Yau compactifications of type II string theories at fixed value of the dilaton and of the Calabi-Yau metric. Specifically, we show that for fivebrane instanton couplings to be well-defined, translations along the intermediate Jacobian must induce non-trivial shifts of the Neveu-Schwarz axion which had thus far been overlooked. As a result, the Neveu-Schwarz axion parametrizes the fiber of a circle bundle, isomorphic to the one in which the fivebrane partition function is valued. In a companion paper [1], we go beyond the present analysis and take steps towards a quantitative description of fivebrane instanton corrections, using a combination of mirror symmetry, S-duality, topological string theory and twistor techniques.
1:  LPTA - Laboratoire de Physique Théorique et Astroparticules
2:  LPTHE - Laboratoire de Physique Théorique et Hautes Energies
Physics/High Energy Physics - Theory
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