KdV limit of the Euler-Poisson system

Abstract

Consider the scaling ${\epsilon }^{1/2}(x-Vt)\to x,{\epsilon }^{3/2}t\to t$ in the Euler-Poisson system for ion-acoustic waves \eqref{equ1}. We establish that as $\epsilon \to 0$, the solutions to such Euler-Poisson system converge globally in time to the solutions of the Korteweg-de Vries equation.

35 pages, Several typos are replaced

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