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The orbital stability of the periodic traveling wave solutions to the defocusing complex modified Korteweg-de Vries equation

The stability of the elliptic solutions to the defocusing complex modified Korteweg-de Vries (cmKdV) equation is studied. The orbital stability of the cmKdV equation was established in [19] when the periodic orbits do not oscillate around zero. In this paper, we study the periodic solutions corresponding to the case that the orbits oscillate around zero. Using the integrability of the defocusing cmKdV equation, we prove the spectral stability of the elliptic solutions. We show that one special linear combination of the first five conserved quantities produces a Lyapunov functional, which implies that the elliptic solutions are orbitally stable with respect to the subharmonic perturbations.

preprint2022arXivOpen access
Wen-Rong Sun
nlin.SI
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Wen-Rong Sun

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