The higher grading structure of the WKI hierarchy and the two-component short pulse equation

Abstract

A higher grading affine algebraic construction of integrable hierarchies, containing the Wadati-Konno-Ichikawa (WKI) hierarchy as a particular case, is proposed. We show that a two-component generalization of the Sch\" afer-Wayne short pulse equation arises quite naturally from the first negative flow of the WKI hierarchy. Some novel integrable nonautonomous models are also proposed. The conserved charges, both local and nonlocal, are obtained from the Riccati form of the spectral problem. The loop-soliton solutions of the WKI hierarchy are systematically constructed through gauge followed by reciprocal B\" acklund transformation, establishing the precise connection between the whole WKI and AKNS hierarchies. The connection between the short pulse equation with the sine-Gordon model is extended to a correspondence between the two-component short pulse equation and the Lund-Regge model.

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Cited by in corpus (6)

• Multi-soliton, multi-breather and higher-order rogue wave solutions to the complex short pulse equation
• Complex short pulse and coupled complex short pulse equations
• Transformations between nonlocal and local integrable equations
• Some Wadati-Konno-Ichikawa type integrable systems and their constructions
• Generalized Riemann-Hilbert-Birkhoff Decomposition and a New Class of Higher Grading Integrable Hierarchies
• Liouville correspondence between the Short-Pulse Hierarchy and the Sine-Gordon Hierarchy