  We classify symmetric backgrounds of eleven-dimensional supergravity up to
local isometry. In other words, we classify triples (M,g,F), where (M,g) is an
eleven-dimensional lorentzian locally symmetric space and F is an invariant
4-form, satisfying the equations of motion of eleven-dimensional supergravity.
The possible (M,g) are given either by (not necessarily nondegenerate)
Cahen-Wallach spaces or by products AdS_d x M for 1 < d < 8 and M a not
necessarily irreducible riemannian symmetric space of dimension 11-d. In most
cases we determine the corresponding F-moduli spaces.

High Energy Physics - Theory;Differential Geometry