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arXiv · 2509.07371

The bidirectional NLS approximation for the one-dimensional Euler-Poisson system

Huimin Liu·Yurui Lu·Xueke Pu
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Abstract

The nonlinear Schrödinger (NLS) equation is known as a universal equation describing the evolution of the envelopes of slowly modulated spatially and temporarily oscillating wave packet in various dispersive systems. In this paper, we prove that under a certain multiple scale transformation, solutions to the Euler-Poisson system can be approximated by the sums of two counter-propagating waves solving the NLS equations. It extends the earlier results [Liu and Pu, Comm. Math. Phys., 371(2), (2019)357-398], which justify the unidirectional NLS approximation to the Euler-Poisson system for the ion-coustic wave. We demonstrate that the solutions could be convergent to two counter-propagating wave packets, where each wave packet involves independently as a solution of the NLS equation. We rigorously prove the validity of the NLS approximation for the one-dimensional Euler-Poisson system by obtaining uniform error estimates in Sobolev spaces. The NLS dynamics can be observed at a physically relevant timespan of order $\mathcal{O}(ε^{-2})$. As far as we know, this result is the first construction and valid proof of the bidirectional NLS approximation.

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Huimin Liu, Yurui Lu, Xueke Pu. 2025-09-09. The bidirectional NLS approximation for the one-dimensional Euler-Poisson system. https://arxiv.org/abs/2509.07371

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