Regular Article – Theoretical Physics
Classical de Sitter solutions in three dimensions without tachyons?
Instituut voor Theoretische Fysica, K.U. Leuven, Celestijnenlaan 200D, 3001, Leuven, Belgium
2 Physics Division, National Technical University of Athens, Zografou Campus, 15780, Athens, Greece
Accepted: 5 October 2020
Published online: 14 October 2020
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.
© The Author(s) 2020
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