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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 …

A new D= 2 supersymmetric representation, the twisted chiral multiplet, is derived.
Describing spins zero and one-half, the twisted multiplet is used to formulate …

We study the generalization of R→ 1/R duality to arbitrary conformally invariant σ-models
with an isometry. We show that any pair of dual σ-models can be represented as quotients of …

In string theory it is known that abelian isometries in the σ-model lead to target space duality.
We generalize this duality to background with non-abelian isometries. The procedure we …

We derive two new classes of integrable theories interpolating between exact CFT WZW or
gauged WZW models and non-Abelian T-duals of principal chiral models or geometric coset …

We point out the existence of nonlinear σ-models on group manifolds which are left
symmetric and right Poisson-Lie symmetric. We discuss the corresponding rich T-duality …

In these lectures a general introduction to T-duality is given. In the abelian case the
approaches of Buscher, and Roc̆ek and Verlinde are reviewed. Buscher's prescription for …

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 …

We show how to implement T-duality along non-abelian isometries in backgrounds with non-
vanishing Ramond fields. When the dimension of the isometry group is odd (even) the …