All AdS(7) solutions of type II supergravity

Abstract

In M-theory, the only AdS(7) supersymmetric solutions are AdS(7) x S-4 and its orbifolds. In this paper, we find and classify new supersymmetric solutions of the type AdS(7) x M-3 in type II supergravity. While in IIB none exist, in IIA with Romans mass (which does not lift to M-theory) there are many new ones. We use a pure spinor approach reminiscent of generalized complex geometry. Without the need for any Ansatz, the system determines uniquely the form of the metric and fluxes, up to solving a system of ODEs. Namely, the metric on M-3 is that of an S-2 fibered over an interval; this is consistent with the Sp(1) R-symmetry of the holographically dual (1,0) theory. By including D8 brane sources, one can numerically obtain regular solutions, where topologically M-3 congruent to S-3.