Double field theory (DFT) is a proposal to incorporate T-duality, a distinctive symmetry of
string theory, as a symmetry of a field theory defined on a double configuration space. The …

We review double field theory (DFT) with emphasis on the doubled spacetime and its
generalized coordinate transformations, which unify diffeomorphisms and b‐field gauge …

We present the details of the recently constructed E 6 (6)-covariant extension of 11-
dimensional supergravity. This theory requires a 5+ 27-dimensional spacetime in which the …

We show that generalised geometry gives a unified description of bosonic eleven-
dimensional supergravity restricted to a d-dimensional manifold for all d≤ 7. The theory is …

We review recent developments in duality symmetric string theory. We begin with the world-
sheet doubled formalism which describes strings in an extended spacetime with extra …

A bstract We consider a flux formulation of Double Field Theory in which fluxes are
dynamical and field-dependent. Gauge consistency imposes a set of quadratic constraints …

A bstract We perform a generalized Scherk-Schwarz dimensional reduction of Double Field
Theory on a twisted double torus. The four dimensional effective action is shown to exactly …

We show that generalised geometry gives a unified description of maximally supersymmetric
consistent truncations of ten‐and eleven‐dimensional supergravity. In all cases the …

A bstract We present the generalized Scherk-Schwarz reduction ansatz for the full
supersymmetric exceptional field theory in terms of group valued twist matrices subject to …

This review provides an introduction to non-geometric backgrounds in string theory. Starting
from a discussion of T-duality, geometric and non-geometric torus-fibrations are reviewed …