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arXiv · 2106.07063

Stationary multi-kinks in the discrete sine-Gordon equation

Ross Parker·P. G. Kevrekidis·Alejandro Aceves
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Abstract

We consider the existence and spectral stability of static multi-kink structures in the discrete sine-Gordon equation, as a representative example of the family of discrete Klein-Gordon models. The multi-kinks are constructed using Lin's method from an alternating sequence of well-separated kink and antikink solutions. We then locate the point spectrum associated with these multi-kink solutions by reducing the spectral problem to a matrix equation. For an $m$-structure multi-kink, there will be $m$ eigenvalues in the point spectrum near each eigenvalue of the primary kink, and, as long as the spectrum of the primary kink is imaginary, the spectrum of the multi-kink will be as well. We obtain analytic expressions for the eigenvalues of a multi-kink in terms of the eigenvalues and corresponding eigenfunctions of the primary kink, and these are in very good agreement with numerical results. We also perform numerical time-stepping experiments on perturbations of multi-kinks, and the outcomes of these simulations are interpreted using the spectral results.

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Ross Parker, P. G. Kevrekidis, Alejandro Aceves. 2021-06-13. Stationary multi-kinks in the discrete sine-Gordon equation. https://doi.org/10.1088/1361-6544/ac3f8d

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