**Speaker:** Chuang Xu* (UA)
*

**Title: **T-duality and Double Field Theory

**Abstract:** T-duality plays an important role in string theory. In this talk, I will give an introduction to the T-duality and its application to the string field theory. In the context of the closed string field theory, via the toroidal compactification, T-duality can be realized as a symmetry in its low-energy (N_L = 1, N_R = 1) massless sector, in which the fields will depend on both the ordinary torus coordinates and the dual coordinates. Such a constructed theory doubling the geometry of the compact space is called the Double Field Theory.

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