The Spectrum of a linearized 2D Euler operator

Details The Spectrum of a linearized 2D Euler operator The Spectrum of a linearized 2D Euler operator

2001-07-17

arxiv.org/abs/math/0107125v1

Mathematics

Analysis of PDEs

Scientific paper

We study the spectral properties of the linearized Euler operator obtained by linearizing the equations of incompressible two dimensional fluid at a steady state with the vorticity that contains only two nonzero complex conjugate Fourier modes. We prove that the essential spectrum coincides with the imaginary axis, and give an estimate from above for the number of isolated nonimaginary eigenvalues. In addition, we prove that the spectral mapping theorem holds for the group generated by the linearized 2D Euler operator.

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