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- W2561495925 abstract "The main purpose of this paper is to extend results, which have been obtained previously to describe the classical scattering of solitons with integrable defects of type I, to include the much larger and intricate collection of finite-gap solutions defined in terms of generalised theta functions. In this context, it is generally not feasible to adopt a direct approach, via ansatze for the fields to either side of the defect tuned to satisfy the defect sewing conditions. Rather, essential use is made of the fact that the defect sewing conditions themselves are intimately related to Backlund transformations in order to set up a strategy to enable the calculation of the field on one side by suitably transforming the field on the other side. The method is implemented using Darboux transformations and illustrated in detail for the sine-Gordon and KdV models. An exception, treatable by both methods, indirect and direct, is provided by the genus 1 solutions. These can be expressed in terms of Jacobi elliptic functions, which satisfy a number of useful identities of relevance to this problem. There are new features to the solutions obtained in the finite-gap context but, in all cases, if a (multi)soliton limit is taken within the finite-gap solutions previously known results are recovered." @default.
- W2561495925 created "2017-01-06" @default.
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- W2561495925 date "2017-06-19" @default.
- W2561495925 modified "2023-10-02" @default.
- W2561495925 title "Type I integrable defects and finite-gap solutions for KdV and sine-Gordon models" @default.
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- W2561495925 doi "https://doi.org/10.1088/1751-8121/aa7612" @default.
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