Continuous spectrum of the 3D Euler equation is a solid annulus

Details Continuous spectrum of the 3D Euler equation is a solid annulus Continuous spectrum of the 3D Euler equation is a solid annulus

2010-10-22

arxiv.org/abs/1010.4756v1

Comptes Rendus Mathematique, Volume 348, Issues 15-16, 2010, Pages 897-900

Mathematics

Analysis of PDEs

Scientific paper

In this note we give a description of the continuous spectrum of the linearized Euler equations in three dimensions. Namely, for all but countably many times $t\in \R$, the continuous spectrum of the evolution operator $G_t$ is given by a solid annulus with radii $e^{t\mu}$ and $e^{t M}$, where $\mu$ and $M$ are the smallest and largest, respectively, Lyapunov exponents of the corresponding bicharacteristic-amplitude system of ODEs.

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