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The wasteland of random supergravities

A bstractWe show that in a general $ \mathcal{N} = {1} $ supergravity with N ≫ 1 scalar fields, an exponentially small fraction of the de Sitter critical points are metastable vacua. Taking the…
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D-terms from generalized NS-NS fluxes in type II

Orientifolds of type II string theory admit a certain set of generalized NS-NS fluxes, including not only the three-form field strength H, but also metric and non-geometric fluxes, which are related…
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D3¯ and dS

The role of the D3 brane in providing de Sitter vacua with spontaneously broken supersymmetry in the KKLT construction is clarified. The first step in this direction was explained in (1, 2): it was…
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De Sitter hunting in a classical landscape

We elaborate on the construction of de Sitter solutions from IIA orientifolds of SU(3)‐structure manifolds that solve the 10‐dimensional equations of motion at tree‐level in the approximation of…
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A note on obstinate tachyons in classical dS solutions

A bstractThe stabilisation of the dilaton and volume in tree-level flux compactifications leads to model independent and thus very powerful existence and stability criteria for dS solutions. In this…
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de Sitter swampland conjecture and the Higgs potential

According to a conjecture recently put forward in arXiv:1806.08362, the scalar potential $V$ of any consistent theory of quantum gravity satisfies a bound $|\nabla V|/V \geq {\cal O}(1)$. This…
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The powers of monodromy

A bstractFlux couplings to string theory axions yield super-Planckian field ranges along which the axion potential energy grows. At the same time, other aspects of the physics remain essentially…
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Searching for slow-roll moduli inflation in massive type IIA supergravity with metric fluxes

We derive several no-go theorems in the context of massive type IIA string theory compactified to four dimensions in a way that, in the absence of fluxes, preserves $\mathcal{N}=1$ supersymmetry. Our…
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Moduli stabilization and cosmology of type IIB on SU(2)-structure orientifolds

We consider type IIB flux compactifications on six-dimensional SU(2)-structure manifolds with O5- and O7-planes. These six-dimensional spaces allow not only for F3 and H3 fluxes but also for F1 and…
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Toroidal orientifolds in IIA with general NS-NS fluxes

Type IIA toroidal orientifolds offer a promising toolkit for model builders, especially when one includes not only the usual fluxes from NS-NS and R-R field strengths, but also fluxes that are T-dual…
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