Pointwise rotation for homeomorphisms with integrable distortion and controlled compression

Abstract

We obtain sharp rotation bounds for homeomorphisms $f:\mathbb{C}\to \mathbb{C}$ whose distortion is in $L_{loc}^p$, $p\ge 1$, and whose inverse have controlled modulus of continuity. The motivation to study this class of maps comes from so-called Yudovich solutions to planar Euler equations. Furthermore, we present examples proving sharpness in a strong sense, thereby settling the borderline case $p=1$ in \cite[Theorem 3]{CHS}.

The new version has been shortened to 15 pages