Title: Towards de Sitter from 10D,
Abstract: Using a 10D lift of non-perturbative volume stabilization in type IIB string
theory we study the limitations for obtaining de Sitter vacua. Based on this we
find that the simplest KKLT vacua with a single Kahler modulus stabilized by a
gaugino condensate cannot be uplifted to de Sitter. Rather, the uplift flattens
out due to stronger backreaction on the volume modulus than has previously been
anticipated, resulting in vacua which are meta-stable and SUSY breaking, but
that are always AdS. However, we also show that setups such as racetrack
stabilization can avoid this issue. In these models it is possible to obtain
supersymmetric AdS vacua with a cosmological constant that can be tuned to zero
while retaining finite moduli stabilization. In this regime, it seems that de
Sitter uplifts are possible with negligible backreaction on the internal
volume. We exhibit this behavior also from the 10D perspective.