  A radiatively stable de Sitter spacetime is constructed by considering an
intrinsically non-commutative and generalized-geometric formulation of string
theory, which is related to a family of F-theory models endowed with
non-trivial anisotropic axion-dilaton backgrounds. In particular, the curvature
of the canonically conjugate dual space provides for a positive cosmological
constant to leading order, that satisfies a radiatively stable see-saw-like
formula, which in turn induces the dark energy in the observed spacetime. We
also comment on the non-commutative phase of the non-perturbative formulations
of string theory/quantum gravity implied by this approach.
