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arXiv 2004.03204math.AP
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一维双幂非线性NLKG方程多孤子的条件稳定性

Conditional stability of multi-solitons for the 1D NLKG equation with double power nonlinearity

Xu Yuan

摘要:

考虑一维非线性Klein-Gordon方程的双幂聚焦-散焦非线性项\begin{equation*} \partial_{t}^{2}u-\partial_{x}^{2}u+u-|u|^{p-1}u+|u|^{q-1}u=0,\quad \mbox{on}\ [0,\infty)\times \mathbb{R}, \end{equation*}和$1<q<p<\infty$ .主要结果说明了不同速度的解耦孤波之和在能量空间$H^{1}(\mathbb{R})\times L^{2}(\mathbb{R})$中的稳定性,直至自然不稳定性。该证明受到Martel、Merle和Tsai [14,15]在类似背景下为广义Korteweg-de Vries方程和非线性薛定谔方程开发的技术的启发。然而,这种策略的适应波型方程需要引入一个新的能量泛函适应洛伦兹变换。

英文摘要:

We consider the one-dimensional nonlinear Klein-Gordon equation with a double power focusing-defocusing nonlinearity \begin{equation*} \partial_{t}^{2}u-\partial_{x}^{2}u+u-|u|^{p-1}u+|u|^{q-1}u=0,\quad \mbox{on}\ [0,\infty)\times \mathbb{R}, \end{equation*} with $1<q<p<\infty$. The main result states the stability in the energy space $H^{1}(\mathbb{R})\times L^{2}(\mathbb{R})$ of the sums of decoupled solitary waves with different speeds, up to the natural instabilities. The proof is inspired by the techniques developed for the generalized Korteweg-de Vries equation and the nonlinear Schrödinger equation in a similar context by Martel, Merle and Tsai [14,15]. However, the adaptation of this strategy to a wave-type equation requires the introduction of a new energy functional adapted to the Lorentz transform.

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