We determine the N = 1 low energy effective action for compactifications of type IIB string theory on compact Calabi-Yau orientifolds in the presence of background fluxes from a Kaluza-Kleinâ€¦ (More)

We consider type II string theory in space-time backgrounds which admit eight supercharges. Such backgrounds are characterized by the existence of a (generically nonintegrable) generalized SU (3)Ã—SUâ€¦ (More)

This paper analyses type II string theories in backgrounds which admit an SU (3)Ã—SU (3) structure. Such backgrounds are designed to linearly realize eight out of the original 32 supercharges and as aâ€¦ (More)

We study compactifications of type IIB supergravity on Calabi-Yau threefolds. The resulting low energy effective Lagrangian is displayed in the large volume limit and its symmetry properties â€“ withâ€¦ (More)

Using a Kaluza-Klein reduction of the fermionic part of the D-brane action we compute D-and F-terms of the N = 1 effective action for generic Calabi-Yau orientifold compactifications in the presenceâ€¦ (More)

We study the low-energy effective Lagrangian of N = 2 heterotic string vacua at the classical and quantum level. The couplings of the vector multiplets are uniquely determined at the tree level,â€¦ (More)

Quantum corrections in the hypermultiplet moduli space of type IIA string theories compactified on Calabi-Yau threefolds are investigated. Talk presented by J. Louis at the 32nd Symposium Ahrenshoopâ€¦ (More)

Using the heteroticâ€“type II duality of N = 2 string vacua in four space-time dimensions we study non-perturbative couplings of toroidally compactified six-dimensional heterotic vacua. In particular,â€¦ (More)

We study BPS domain wall solutions of 5-dimensional N = 2 supergravity where isometries of the hypermultiplet geometry have been gauged. We derive the corresponding supersymmetric flow equations andâ€¦ (More)

In this paper we study K3 compactification of ten-dimensional massive type IIA theory with all possible Ramond-Ramond background fluxes turned on. The resulting sixdimensional theory is a new massiveâ€¦ (More)