Type IIA AdS4 compactifications on cosets, interpolations and domain walls

We present a classification of a large class of type IIA N = 1 supersymmetric compactifications to AdS(4), based on left-invariant SU(3)-structures on coset spaces. In the absence of sources the parameter spaces of all cosets leading to a solution contain regions corresponding to nearly-Kahler structure. I. e. all these cosets can be viewed as deformations of nearly-Kahler manifolds. Allowing for (smeared) six-brane/orientifold sources we obtain more possibilities. In the second part of the paper, we use a simple ansatz, which can be applied to all six-dimensional coset manifolds considered here, to construct explicit thick domain wall solutions separating two AdS(4) vacua of different radii. We also consider smooth interpolations between AdS(4) x M-6 and R-1,R-2 x M-7, where M-6 is a nearly-Kahler manifold and M-7 is the G(2)-holonomy cone over M-6.