## Enstrophy without boost symmetry

Natalia Pinzani-Fokeeva, Amos Yarom

SciPost Phys. 12, 136 (2022) · published 21 April 2022

### Abstract

We construct an approximately conserved current for $2+1$ dimensional, Aristotelian (non boost invariant), fluid flow. When Aristotelian symmetry is enhanced to Galilean symmetry, this current matches the enstrophy current responsible for the inverse cascade in incompressible fluids. Other enhancements of Aristotelian symmetry discussed in this work include Lorentzian, Carrollian and Lifshitz scale symmetry.

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