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Orbital Stability Of A Sum Of Solitons And Breathers Of The Modified Korteweg-de Vries Equation

In this article, we prove that a sum of solitons and breathers of the modified Korteweg-de Vries equation (mKdV) is orbitally stable. The orbital stability is shown in H^2. More precisely, we will show that if a solution of (mKdV) is close enough to a sum of solitons and breathers with distinct velocities at t=0 in the H^2 sense, then it stays close to this sum of solitons and breathers, up to space translations for solitons and space or phase translations for breathers. From this, we deduce the orbital stability of a multi-breather of (mKdV), constructed in [49]. As an application of the orbital stability and the formula for multi-breathers obtained by inverse scattering method [51], we deduce a result about uniqueness of multi-breathers.

preprint2022arXivOpen access
Alexander Semenov
math.AP
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Alexander Semenov

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