Abstract
The classical-dS scenario in the type II string theories proposes to search for dS vacua of orientifold flux compactifications in a regime where string corrections to the compactified effective field theory are negligible. We study a minimal extension of this scenario in which the leading string corrections to the O-plane/D-brane actions at the 4-derivative order are included but higher orders as well as string corrections in the bulk are self-consistently neglected. Our proposal is motivated by a recent debate about dS solutions with O8-planes which circumvent a classical no-go theorem due to unusual sources leading to so-called permissive boundary conditions for the 10D supergravity fields. We argue that such sources do not arise in classical supergravity but ask whether including the 4-derivative corrections leads to sources that have a similar effect. However, we find that the 4-derivative corrections do not allow meta-stable dS in a class of models with O8-planes and/or D8-branes we consider. We also study related models which in addition contain O6-planes/D6-branes and find that again no meta-stable dS is allowed, both classically and including the 4-derivative corrections. While some of the arguments in this work require the backreaction of the O-plane/D-brane sources to be small, others are valid including the full backreaction.
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Acknowledgments
This research was funded by the Austrian Science Fund (FWF) under project number P 34562-N and by the German Research Foundation (Deutsche Forschungsgemeinschaft) under project number 516370439.
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Horer, L., Junghans, D. Almost classical de Sitter?. J. High Energ. Phys. 2024, 38 (2024). https://doi.org/10.1007/JHEP09(2024)038
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DOI: https://doi.org/10.1007/JHEP09(2024)038