Linear Vortex Symmetrization: The Spectral Density Function

Linear Vortex Symmetrization: The Spectral Density Function
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线性涡旋对称化:谱密度函数

DOI:
10.1007/s00205-022-01815-y
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发表时间:
2022
影响因子:
2.5
通讯作者:
Jia, Hao
Jia, Hao
中科院分区:
数学1区
文献类型:
--
作者:
Ionescu, Alexandru D.;Jia, Hao

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我们研究了2不可压缩欧拉方程的解,该方程在径向减小的涡旋稳定状态下线性化。我们的主要目标是理解与线性化算子相关的谱密度函数的平滑性,我们希望这将是证明径向递减涡的完全非线性渐近稳定性的一步。考虑谱密度函数的动机是不可能用一个调制剖面来描述涡度或流函数。实际上有两个剖面,一个在物理涡度水平,一个在流函数水平。谱密度函数使我们能够识别这些剖面,其平滑性导致流函数的点向衰减,这与在bedrossian - coti Zelati-Vicol (Ann PDE 5(4):1 - 192,2019)中首次证明的衰减估计一致。
We investigate solutions of the 2dincompressible Euler equations, linearized around steady states which are radially decreasing vortices. Our main goal is to understand the smoothness of what we call thespectral density functionassociated with the linearized operator, which we hope will be a step towards proving full nonlinear asymptotic stability of radially decreasing vortices. The motivation for considering the spectral density function is that it is not possible to describe the vorticity or the stream function in terms of one modulated profile. There are in fact two profiles, both at the level of the physical vorticity and at the level of the stream function. The spectral density function allows us to identify these profiles, and its smoothness leads to pointwise decay of the stream function which is consistent with the decay estimates first proved inBedrossian–Coti Zelati–Vicol(Ann PDE 5(4):1–192, 2019).
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