Jean Avan, Anastasia Doikou
Application of our algebraic approach to Liouville integrable defects is proposed for the sine-Gordon model. Integrality of the model is ensured by the underlying classical r-matrix algebra. The first local integrals of motion are identified together with the corresponding Lax pairs. Continuity conditions imposed on the time components of the entailed Lax pairs give rise to the sewing conditions on the defect point consistent with Liouville integrability
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http://arxiv.org/abs/1205.1661
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