Justification of the NLS Approximation for the Euler–Poisson Equation

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 givin...

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Published in:Communications in mathematical physics 2019-10, Vol.371 (2), p.357-398
Main Authors: Liu, Huimin, Pu, Xueke
Format: Article
Language:English
Subjects:
Approximation
Canonical forms
Classical and Quantum Gravitation
Complex Systems
Functionals
Mathematical analysis
Mathematical and Computational Physics
Mathematical Physics
Nonlinearity
Norms
Physics
Physics and Astronomy
Poisson equation
Quantum Physics
Relativity Theory
Theoretical
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description 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.
doi_str_mv 10.1007/s00220-019-03576-4
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subjects Approximation
Canonical forms
Classical and Quantum Gravitation
Complex Systems
Functionals
Mathematical analysis
Mathematical and Computational Physics
Mathematical Physics
Nonlinearity
Norms
Physics
Physics and Astronomy
Poisson equation
Quantum Physics
Relativity Theory
Theoretical
title Justification of the NLS Approximation for the Euler–Poisson Equation
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