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 …

A bstract We reformulate ten-dimensional type II supergravity as a generalised geometrical
analogue of Einstein gravity, defined by an O (9, 1)× O (1, 9)⊂ O (10, 10)×\({\mathbb …

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 …

A bstract We investigate the generalised diffeomorphisms in M-theory, which are gauge
transformations unifying diffeomorphisms and tensor gauge transformations. After giving an …

A bstract We reformulate eleven-dimensional supergravity, including fermions, in terms of
generalised geometry, for spacetimes that are warped products of Minkowski space with a d …

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 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 …

Besides the familiar D-branes, string theory contains a vast number of other non-perturbative
objects. While a complete classification is lacking, many of these objects are related to each …