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Helicity is the only integral invariant of volume-preserving transformations

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arxiv 1602.04745 v1 pith:SAZMDYVX submitted 2016-02-15 math.DS math-phmath.DGmath.MP

classification math.DSmath-phmath.DGmath.MP
keywords helicityintegralinvariantvolume-preservingmathcalonlyprovetransformations
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abstract

We prove that any regular integral invariant of volume-preserving transformations is equivalent to the helicity. Specifically, given a functional $\mathcal I$ defined on exact divergence-free vector fields of class $C^1$ on a compact 3-manifold that is associated with a well-behaved integral kernel, we prove that $\mathcal I$ is invariant under arbitrary volume-preserving diffeomorphisms if and only if it is a function of the helicity.

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  1. Distribution of magnetic helicity and energy with height in solar atmosphere

    astro-ph.SR 2026-08 reject novelty 5.0 of 10

    Using 150 active regions, the paper finds helicity and energy are concentrated low in the corona and proposes an 81 Mm extrapolation cutoff for 97% retention.

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