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Asymptotic stability of the sine-Gordon kinks under perturbations in weighted Sobolev norms
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We study the asymptotic stability of the sine-Gordon kinks under small perturbations in weighted Sobolev norms. Our main tool is the B\"acklund transform which reduces the study of the asymptotic stability of the kinks to the study of the asymptotic decay of solutions near zero. Our results consist of two parts. First, we prove an asymptotic stability result similar to the local results in arXiv:2003.09358 and arXiv:2009.04260. Our assumptions are the same as those in the local result in arXiv:2009.04260. In its proof, we apply a result obtained by the inverse scattering method on the local decay of the solutions with sufficiently small and localized initial data. Moreover, we derive an asymptotic formula for the perturbations, i.e. the difference between solutions and kinks. This result is similar to that in arXiv:2106.09605 and the full asymptotic stability result in arXiv:2009.04260. In its proof, we apply a result obtained by the method of testing by wave packets on the pointwise decay of the solutions with small and localized data.
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Cited by 1 Pith paper
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On the B\"acklund transform and the stability of the line soliton of the KP-II equation on $\mathbb R^2$
A rigorous Bäcklund transform is constructed for KP-II on the plane, and its image is shown to be a codimension-1 manifold, yielding codimension-1 L2 stability of the line soliton at sharp regularity.
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