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arXiv 2006.01136math.AP
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关于Kirchhoff方程的normal form

On the normal form of the Kirchhoff equation

Pietro Baldi, Emanuele Haus

摘要:

考虑$d$维环面$\mathbb{T}^d$上的基尔霍夫方程$$ \partial_{tt} u - Δu \Big( 1 + \int_{\mathbb{T}^d} |\nabla u|^2 \Big) = 0 $$.在以前的论文中,我们证明了,在第一步的准线性规范形式,共振三次项显示出可积的行为,即他们没有贡献的能量估计。这就引出了一个问题,即在范式的下一个步骤中是否也会出现相同的结构。在本文中,我们执行第二步,并给出了否定的回答前一个问题:五次共振项给一个非零的贡献的能量估计。这不仅是一个正式的计算,因为我们证明了正规形变换是有界的索伯列夫空间之间。

英文摘要:

Consider the Kirchhoff equation $$ \partial_{tt} u - Δu \Big( 1 + \int_{\mathbb{T}^d} |\nabla u|^2 \Big) = 0 $$ on the $d$-dimensional torus $\mathbb{T}^d$. In a previous paper we proved that, after a first step of quasilinear normal form, the resonant cubic terms show an integrable behavior, namely they give no contribution to the energy estimates. This leads to the question whether the same structure also emerges at the next steps of normal form. In this paper, we perform the second step and give a negative answer to the previous question: the quintic resonant terms give a nonzero contribution to the energy estimates. This is not only a formal calculation, as we prove that the normal form transformation is bounded between Sobolev spaces.

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。

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