arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2102.09852math.APmath.DS
收藏

能量空间中Hamilton偏微分方程的Birkhoff normal forms

Birkhoff normal forms for Hamiltonian PDEs in their energy space

Joackim Bernier, Benoît Grébert

摘要:

研究了半线性色散Hamilton偏微分方程小解的长时间行为。只要系统具有一个新的非共振条件和足够强的能量估计,我们证明了它的低超作用几乎保持很长时间。粗略地说,这意味着,为了交换能量,模式必须以相同的频率振荡。与先前已有的结果相反,我们不要求解特别光滑。他们只需要生活在能量空间里。我们将我们的结果应用到d = 1维的非线性Klein-Gordon方程和d维的非线性Schr{<$}dinger方程$\le$ 2。

英文摘要:

We study the long time behavior of small solutions of semi-linear dispersive Hamiltonian partial differential equations on confined domains. Provided that the system enjoys a new non-resonance condition and a strong enough energy estimate, we prove that its low super-actions are almost preserved for very long times. Roughly speaking, it means that, to exchange energy, modes have to oscillate at the same frequency. Contrary to the previous existing results, we do not require the solutions to be especially smooth. They only have to live in the energy space. We apply our result to nonlinear Klein-Gordon equations in dimension d = 1 and nonlinear Schr{ö}dinger equations in dimension d $\le$ 2.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑