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arXiv 1602.08016math.AP
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拟线性Klein-Gordon方程非线性薛定谔逼近的证明

Justification of the Nonlinear Schrödinger approximation for a quasilinear Klein-Gordon equation

Wolf-Patrick Düll

摘要:

考虑一类带拟线性二次项的非线性Klein-Gordon方程。非线性薛定谔(NLS)方程可以被导出为描述拟线性Klein-Gordon方程的慢调制空间和时间振荡波包样解的包络演化的形式近似方程。本文的目的是提出一种方法,它允许一个证明误差估计之间的精确解的拟线性Klein-Gordon方程和通过NLS方程得到的形式近似的Sobolev范数。在索伯列夫空间中,利用误差估计首次证明了带拟线性二次项的非线性双曲型方程的NLS逼近的有效性.我们期望本文中开发的方法能够回答其他准线性双曲系统的NLS逼近的有效性的相关问题。

英文摘要:

We consider a nonlinear Klein-Gordon equation with a quasilinear quadratic term. The Nonlinear Schrödinger (NLS) equation can be derived as a formal approximation equation describing the evolution of the envelopes of slowly modulated spatially and temporarily oscillating wave packet-like solutions to the quasilinear Klein-Gordon equation. It is the purpose of this paper to present a method which allows one to prove error estimates in Sobolev norms between exact solutions of the quasilinear Klein-Gordon equation and the formal approximation obtained via the NLS equation. The paper contains the first validity proof of the NLS approximation of a nonlinear hyperbolic equation with a quasilinear quadratic term by error estimates in Sobolev spaces. We expect that the method developed in the present paper will allow an answer to the relevant question of the validity of the NLS approximation for other quasilinear hyperbolic systems.

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