h-Principles for the incompressible Euler equations

Abstract

Recently, De Lellis and Székelyhidi constructed Hölder continuous, dissipative (weak) solutions to the incompressible Euler equations in the torus ${\mathbb{T}}^3$. The construction consists in adding fast oscillations to the trivial solution. We extend this result by establishing optimal h-principles in two and three space dimensions. Specifically, we identify all subsolutions (defined in a suitable sense) which can be approximated in the $H^{-1}$-norm by exact solutions. Furthermore, we prove that the flows thus constructed on ${\mathbb{T}}^3$ are genuinely three-dimensional and are not trivially obtained from solutions on ${\mathbb{T}}^2$.

29 pages, no figures

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