# Double field theory and stringy geometry

- Institution: CERN
- Department: TH Theoretical Seminar
- Speaker: Chris M Hull
- Year: 2015
- Language: English
- Subjects: Mathematics
- Source: [CERN](https://videos.cern.ch/record/3004650)
- Licence: [CERN](http://copyright.web.cern.ch)
- Who can watch: Tweens profiles and older (sources give no ratings; placed by Invisible Network from the source's own words)

One of the ways in which string theory differs from conventional field theories is that it has duality symmetries, which allow the construction of so-called non-geometric backgrounds, such as T-folds which have T-duality transition functions. String theory on a torus requires the introduction of dual coordinates conjugate to string winding number. This leads to physics and novel geometry in a doubled space, with non-trivial dynamics in the full doubled space-time. The geometry and physics of doubled space-time will be developed and discussed, along with generalisations to M-theory..

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## Lectures

1. [Double field theory and stringy geometry](https://invisiblenetwork.ai/learn/cern/3004650/7d6d5c5f8b55), 1 h 5 min (CERN's player)