TH String Theory Seminar

# Uplifting Runaways

## by Severin Lüst (Ecole Polytechnique)

Europe/Zurich
4/3-006 - TH Conference Room (CERN)

### 4/3-006 - TH Conference Room

#### CERN

100
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Description
In this talk I will discuss a mechanism which can lead to a possible instability of the KKLT construction for de Sitter vacua. The sphere at the tip of a warped deformed conifold throat can be destabilized by antibranes placed in the throat. Consequently, the stabilization of moduli should not be treated independently from the antibrane uplift in KKLT-like scenarios. This conifold destabilization mechanism can be avoided by turning on a large amount of flux on the sphere, but tadpole cancelation constraints the hierarchy of scales in a type IIB flux compactification. This indicates that antibrane uplift cannot be used to construct stable de Sitter vacua with a small cosmological constant in perturbative string theory. The values of V and V ′ for these scenarios can be parametrically small, but we find that V′/V is still consistent with the de Sitter swampland conjecture.