Classical de Sitter solutions in three dimensions without tachyons?

Abstract

We continue the study of compactifications of massive IIA supergravity on G2 orientifolds and demonstrate that breaking supersymmetry with anti-D2 and anti-D6 sources leads to 3d theories for which the typical tachyons haunting classical dS solutions can be absent. However for a concrete torus example the meta-stable dS window disappears after a quantization of fluxes and charges. We discuss the prospects of more general G2 compactifications and argue that they could potentially alleviate the tachyon problem by introducing larger tadpole numbers and warped throats. However, exactly those ingredients then seem to push the vacuum towards the brink of perturbative brane-flux decay in the open string sector. This is either a remarkable illustration of the no-dS swampland conjecture or such vacua live in very difficult to control regions of parameter space.

27 pages, 2 figures, v2, updated title and references

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Cited by in corpus (7)

• (Quasi-) de Sitter solutions across dimensions and the TCC bound
• Three-dimensional flux vacua from IIB on co-calibrated G2 orientifolds
• Scale-separated AdS${}_3$ vacua from $G_2$-orientifolds using bispinors
• O6-plane backreaction on scale-separated Type IIA AdS${}_3$ vacua
• Tachyonic de Sitter solutions of 10d type II supergravities
• de Sitter decay through goldstino evaporation
• Hitchhiker's Guide to the Swampland: The Cosmologist's Handbook to the string-theoretical Swampland Programme