Vacua of N=2 gauged supergravity derived from non-homogeneous quaternionic spaces

We discuss a class of 4-dimensional non-homogeneous quaternionic spaces, which become the two known homogeneous spaces (EAdS(4) and SU(2, 1)/U(2)) in certain limits. These moduli spaces have two regions where the metric is positive definite, separated by a non-physical region where the metric has timelike directions and which contains a curvature singularity. They admit four isometries and we consider their general Abelian gauging. The critical points of the resulting superpotential and hence the possible domain wall solutions differ significantly in the two regions. On one side one can construct only singular walls, whereas in the other we found a smooth domain wall interpolating between two infrared critical points located exactly on the boundary of the physical allowed parameter region. (C) 2002 Elsevier Science B.V. All rights reserved.