Double Field Theory: A Pedagogical Review

Understand

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 aim of this review is to provide a pedagogical presentation of DFT and its applications.
• We first introduce some basic ideas on T-duality and supergravity in order to proceed to the construction of generalized diffeomorphisms and an invariant action on the double space.
• Steps towards the construction of a geometry on the double space are discussed.