Non-commutativity and non-associativity of the doubled string in non-geometric backgrounds

Abstract

We use a T-duality invariant action to investigate the behaviour of a string in non-geometric backgrounds, where there is a non-trivial global $O(D,D)$ patching or monodromy. This action leads to a set of Dirac brackets describing the dynamics of the doubled string, with these brackets determined only by the monodromy. This allows for a simple derivation of non-commutativity and non-associativity in backgrounds which are (even locally) non-geometric. We focus here on the example of the three-torus with H-flux, finding non-commutativity but not non-associativity, and also comment on the relation to the exotic $5_2^2$ brane, which shares the same monodromy.

arXiv comment31 pages, v2: refs added, corrections to sec 5, results updated, v3: published version with additional discussion in sec 5

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• The Geometry, Branes and Applications of Exceptional Field Theory
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• Open-string T-duality and applications to non-geometric backgrounds
• Equivalence of open/closed strings
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• Duality Covariant Solutions in Extended Field Theories
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