arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2207.09986math.APmath.DS
收藏

Beam方程的次指数稳定性

Sub-exponential stability for the Beam equation

Roberto Feola, Jessica Elisa Massetti

摘要:

本文考虑一维空间中一类具有哈密顿非线性项的单参数梁方程族在周期边界条件下的运动。在统一的泛函框架下,研究了两类可微性下初值的长时间演化:(i)Sobolev正则性子空间,(ii)严格包含在索伯列夫空间中但严格包含Gevrey空间的无穷多个可微函数的子空间.在这两种情况下,我们证明指数型稳定时间。该结果适用于几乎所有质量参数,并且是通过将范式技术与比Bourgain提出的条件弱的适当丢番图条件相结合而获得的。这是Sobolev正则性中关于退化方程的第一个结果,其中仅使用一个参数来调谐振荡的线性频率。

英文摘要:

We consider a one-parameter family of beam equations with Hamiltonian non-linearity in one space dimension under periodic boundary conditions. In a unified functional framework we study the long time evolution of initial data in two categories of differentiability: (i) a subspace of Sobolev regularity, (ii) a subspace of infinitely many differentiable functions which is strictly contained in the Sobolev space but which strictly contains the Gevrey one. In both cases we prove exponential type times of stability. The result holds for almost all mass parameters and it is obtained by combining normal form techniques with a suitable Diophantine condition weaker than the one proposed by Bourgain. This is the first result of this kind in Sobolev regularity for a degenerate equation, where only one parameter is used to tune the linear frequencies of oscillations.

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。

↑