The O(D,D) Geometry of String Theory
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If you have a question about this talk, please contact Alasdair Routh.
I will briefly review the Tduality of string theory and how double field theory gives a manifestly Tduality invariant action for 10d SUGRA at the cost of introducing new coordinates related to the winding modes of strings. Double field theory not only combines the NSNS sector of 10d SUGRA into a generalised metric but also combines the infinitesimal symmetries into a generalised Lie derivative. In order to define a covariant derivative with respect to this Lie derivative requires a new geometry which can be built using a flat but torsionful connection. The geometric information is now fully contained in the torsion and I will show how to use this torsion to construct the double field theory action. If time permits I will discuss how this relates to the action of gauged supergravities using the ScherkSchwarz procedure.
This talk is part of the HEP/GR Informal Seminar Series for Graduate Students series.
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