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

The zero modes of closed strings on a torus—the torus coordinates plus dual coordinates
conjugate to winding number—parameterize a doubled torus. In closed string field theory …

We reformulate the Hamiltonian form of bosonic eleven dimensional supergravity in terms of
an object that unifies the three-form and the metric. For the case of four spatial dimensions …

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 …

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 …

This is a review of exceptional field theory: a generalisation of Kaluza–Klein theory that
unifies the metric and p-form gauge field degrees of freedom of supergravity into a …

While the fundamental object in Riemannian geometry is a metric, closed string theories call
for us to put a two-form gauge field and a scalar dilaton on an equal footing with the metric …

In recent development of double field theory, as for the description of the massless sector of
closed strings, the spacetime dimension is formally doubled, ie from D to D+D, and the T …