On de Sitter Vacua in Type IIA Orientifold Compactifications
arXiv:hep-th/0506181 · doi:10.1016/j.physletb.2005.11.059
Abstract
This letter discusses the orientifold projection of the quantum corrections to type IIA strings compactified on rigid Calabi-Yau threefolds. It is shown that N=2 membrane instanton effects give a holomorphic contribution to the superpotential, while the perturbative corrections enter into the Kahler potential. At the level of the scalar potential the corrections to the Kahler potential give rise to a positive energy contribution similar to adding anti-D3-branes in the KKLT scenario. This provides a natural mechanism to lift an AdS vacuum to a meta-stable dS vacuum.
5 pages, no figures, minor changes, references added