Abstract
The nonlinear Schrödinger (NLS) equation can be derived as a formal approximation equation describing the envelopes of slowly modulated spatially and temporarily oscillating wave packet-like solutions to the ion Euler–Poisson equation. In this paper, we rigorously justify such approximation by giving error estimates in Sobolev norms between exact solutions of the ion Euler–Poisson system and the formal approximation obtained via the NLS equation. The justification consists of several difficulties such as the resonances and loss of regularity, due to the quasilinearity of the problem. These difficulties are overcome by introducing normal form transformation and cutoff functions and carefully constructed energy functional of the equation.
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Acknowledgements
The second author thanks Professor Yan Guo for his valuable discussions and suggestions on this paper. The authors thank the referees for their helpful comments of the manuscript.
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This study was funded by the National Natural Science Foundation of China (Grant Number 11871172).
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Communicated by C. De Lellis.
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This work is supported by NSFC (11871172).
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Liu, H., Pu, X. Justification of the NLS Approximation for the Euler–Poisson Equation. Commun. Math. Phys. 371, 357–398 (2019). https://doi.org/10.1007/s00220-019-03576-4
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DOI: https://doi.org/10.1007/s00220-019-03576-4