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.

我们继续研究在G2方向上的大量IIA超重力的紧实化，并证明用反D2和反D6源打破超对称性会导致3d理论，而典型的tachyons困扰着经典dS解决方案。但是，对于一个具体的圆环示例，在对通量和电荷进行量化之后，亚稳态dS窗口消失了。我们讨论了更一般的G2压缩的前景，并认为它们可以通过引入更大的t数和弯曲的喉咙来缓解Tachyon问题。然而，正是这些成分似乎将真空推向开弦区域扰动性的麸皮-通量衰减的边缘。