Bubble instability of mIIA on AdS4 × S6

We consider compactifications of massive IIA supergravity on a six-sphere. This setup is known to give rise to non-supersymmetric AdS4 vacua preserving SO(7) as well as G2 residual symmetry. Both solutions have a round S 6 metric and are supported by the Romans’ mass and internal F6 flux. While the SO(7) invariant vacuum is known to be perturbatively unstable, the G2 invariant one has been found to have a fully stable Kaluza-Klein spectrum. Moreover, it has been shown to be protected against brane-jet instabilities. Motivated by these results, we study possible bubbling solutions connected to the G2 vacuum, representing non-perturbative instabilities of the latter. We indeed find an instability channel represented by the nucleation of a bubble of nothing dressed up with a homogeneous D2 brane charge distribution in the internal space. Our solu tion generalizes to the case where S 6 is replaced by any six-dimensional nearly-Kähler manifold.