On de Sitter string vacua from anti-d3-branes in the large volume scenario

We consider de Sitter vacua realised in concrete type IIB Calabi-Yau compactifications with an anti D3-brane at the tip of a warped throat of Klebanov-Strassler type. The Kahler moduli are stabilised together with the complex structure modulus of the warped throat. The volume is exponentially large as in the large volume scenario (LVS). We analyse the conditions on the parameters of the EFT such that they are in the region of validity of our approximations, there are no runaway problems and the vacua satisfy all consistency constraints, such as tadpole cancellation. We illustrate our results with an explicit Calabi-Yau orientifold with two Kahler moduli and one antibrane on top of an O3-plane in a warped throat, that has the goldstino as its only massless state. The moduli are stabilised with g(s)similar to 0.2 and volume V similar to 10(4) in string units, justifying the approximation used to derive the corresponding EFT. Although the model lacks chiral matter, it is presented as a proof of concept, chosen to be the simplest realisation of antibrane uplift.

Automated summary

This study focuses on de Sitter vacua in concrete type IIB Calabi-Yau compactifications with an anti D3-brane for stabilizing Kahler moduli and complex structure moduli, with exponentially large volume. Analysis of the effective field theory parameters ensures validity of approximations, absence of runaway issues, and satisfaction of consistency constraints in the vacua.