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arXiv · 2109.06384

Long time asymptotic for the Wadati-Konno-Ichikawa equation with finite density initial data

Zhi-Qiang Li·Shou-Fu Tian·Jin-Jie Yang
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Abstract

In this work, we investigate the Cauchy problem of the Wadati-Konno-Ichikawa (WKI) equation with finite density initial data. Employing the $\bar{\partial}$-generalization of Deift-Zhou nonlinear steepest descent method, we derive the long time asymptotic behavior of the solution $q(x,t)$ in space-time soliton region. Based on the resulting asymptotic behavior, the asymptotic approximation of the WKI equation is characterized with the soliton term confirmed by $N(I)$-soliton on discrete spectrum and the $t^{-\frac{1}{2}}$ leading order term on continuous spectrum with residual error up to $O(t^{-\frac{3}{4}})$. Our results also confirm the soliton resolution conjecture for the WKI equation with finite density initial data.

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Zhi-Qiang Li, Shou-Fu Tian, Jin-Jie Yang. 2021-09-14. Long time asymptotic for the Wadati-Konno-Ichikawa equation with finite density initial data. https://arxiv.org/abs/2109.06384

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