Abstract
A family of periodic travelling wave solutions parameterized by the wavenumber is shown to bifurcate from the trivial solution in a perturbed KdV equation. Studying linearized eigenvalue problem about each periodic travelling wave solution, all of them are shown to be unstable immediately after the bifurcation in contrast to the Eckhaus stability/instability. Analysis from a dynamical viewpoint suggests that “modulated periodic waves” are obtained by a secondary bifurcation from periodic travelling waves as a super critical Hopf bifurcation.
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Ogawa, T. Periodic travelling waves and their modulation. Japan J. Indust. Appl. Math. 18, 521–542 (2001). https://doi.org/10.1007/BF03168589
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DOI: https://doi.org/10.1007/BF03168589