O(d,d) transformations preserve classical integrability

Monday, 8 July, 2019

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In this note, we study the action of O(d,d) transformations on the integrable structure of two-dimensional non-linear sigma models via the doubled formalism. We construct the Lax pairs associated with the O(d,d)-transformed model and find that they are in general non-local because they depend on the winding modes. We conclude that every O(d,d;\mathbb{R}) deformation preserves integrability. As an application we compute the Lax pairs for continuous families of deformations, such as J\bar{J} marginal deformations and TsT transformations of the three-sphere with H-flux.


Domenico Orlando
Susanne Reffert
Yuta Sekiguchi
Kentaroh Yoshida