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Résumé |
Identifying which boundary conditions preserve integrability in two-dimensional sigma-models is a basic structural question, relevant from open string dynamics to impurity problems. I will discuss a simple analytic approach that determines integrable boundary conditions through the divisor structure of the Lax connection, offering a distinct viewpoint that generalises previous constructions. As an application, I will treat open strings on AdS3 x S3 with mixed NSNS-RR flux, where the standard approaches cease to work at generic flux. Using our analytic approach we will however find two branches of integrable boundary conditions, one of which accommodates D-branes wrapping twisted conjugacy classes for arbitrary flux values. These correspond to the familiar conformal D-branes at the WZW point, thereby opening future paths to link integrability with conformal perturbation theory. Based on 2601.09935. |
