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Compactly supported anomalous weak solutions for 2D Euler equations with vorticity in Hardy spaces
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abstract
In a previous work (arXiv:2306.05948), we constructed by convex integration examples of energy dissipating solutions to the 2D Euler equations on $\mathbb{R}^2$ with vorticity in the real Hardy space $H^p(\mathbb{R}^2)$. In the present paper, we develop tools that significantly improve that result in two ways: Firstly, we achieve vorticities in $H^p(\mathbb{R}^2)$ in the optimal range $p\in (0,1)$ compared to $(2/3,1)$ in our previous work. Secondly, the solutions constructed here possess compact support and in particular preserve linear and angular momenta.
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Pathological solutions of Navier-Stokes equations on $\mathbb{T}^2$ with gradients in Hardy spaces
For 2D Navier-Stokes on a torus, non-uniqueness holds with velocity gradients in C([0,T], H^p) for every exponent 0 < p < 1, making p = 1 the sharp threshold between non-uniqueness and uniqueness in the vorticity path space.
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