Stability in the Energy Space of the Sum of N Peakons for the Degasperis-Procesi Equation
Résumé
The Degasperis-Procesi equation possesses well-known peaked solitary waves that are called peakons. Their stability has been established by Lin and Liu in [5]. In this paper, we localize the proof (in some suitable sense detailed in Section 3) of the stability of a single peakon. Thanks to this, we extend the result of stability to the sum of N peakons traveling to the right with respective speeds c1, . . . , cN , such that the difference between consecutive speeds ci − ci−1 is large enough, to cancel all interactions.
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