Abstract
The presence of RR and NS three-form fluxes in type IIB
string compactification on a Calabi-Yau orientifold gives rise to a
nontrivial superpotential W for the dilaton and complex structure
moduli. This superpotential is computable in terms of the period
integrals of the Calabi-Yau manifold. In this paper, we present
explicit examples of both supersymmetric and nonsupersymmetric
solutions to the resulting 4d 
= 1 supersymmetric no-scale
supergravity, including some nonsupersymmetric solutions with
relatively small values of W. Our examples arise on orientifolds
of the hypersurfaces in WP41,1,1,1,4 and
WP41,1,2,2,6. They serve as explicit illustrations of
several of the ingredients which have played a role in the recent
proposals for constructing de Sitter vacua of string theory.
Export citation and abstract BibTeX RIS