Self-similar instability and forced nonuniqueness: an application to the 2D Euler equations

Michele Dolce; Giulia Mescolini

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arXiv · 2411.18452

Self-similar instability and forced nonuniqueness: an application to the 2D Euler equations

Michele Dolce·Giulia Mescolini

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Abstract

Building on an approach introduced by Golovkin in the '60s, we show that nonuniqueness in some forced PDEs is a direct consequence of the existence of a self-similar linearly unstable eigenvalue: the key point is a clever choice of the forcing term removing complicated nonlinear interactions. We use this method to give a short and self-contained proof of nonuniqueness in 2D perfect fluids, first obtained in Vishik's groundbreaking result. In particular, we present a direct construction of a forced self-similar unstable vortex, where we treat perturbatively the self-similar operator in a new and more quantitative way.

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Michele Dolce, Giulia Mescolini. 2024-11-27. Self-similar instability and forced nonuniqueness: an application to the 2D Euler equations. https://arxiv.org/abs/2411.18452

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