Luca Scala

Dualities are a fundamental aspect of string theories. They provide a useful tool to investigate connections between distinct theories and to generate solutions for complicated problems starting from simple ones. In this talk I will present an introduction to a modern technique to deal with some of these dualities, called T-dualities, in a very elegant and powerful way: Double Field Theory (DFT). At first, I will present a naive introduction to the notion of (abelian) T-duality in string theory, and then I will motivate the emergence of DFT by the requirement of having a theory covariant under such T-dualities. Lastly, I will discuss some generalisations to other types of string theory dualities and briefly present some interesting applications of this formalism.