On de Sitter Vacua in Type IIA Orientifold Compactifications

Details On de Sitter Vacua in Type IIA Orientifold Compactifications On de Sitter Vacua in Type IIA Orientifold Compactifications

2005-06-22

arxiv.org/abs/hep-th/0506181v2

Phys.Lett. B633 (2006) 125-128

Physics

High Energy Physics

High Energy Physics - Theory

5 pages, no figures, minor changes, references added

Scientific paper

10.1016/j.physletb.2005.11.059

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.

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