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Supergravity, T-duality and Double Field Theory

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I show why the existing formulation of supergravity cannot accommodate T-duality, a basic symmetry of string theory. An effort to resolve this issue leads to the introduction of so-called `exotic branes’. I discuss how a similar issue arises in Double Field Theory, a reformulation of supergravity which is supposed to make T-duality manifest.

This talk is part of the Mathematical Physics Seminar series.

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