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Relative Helicity and Tiling Twist
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Relative Helicity and Tiling Twist
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We consider domino tilings of 3D cubiculated regions. The tilings have two invariants, flux and twist, often integer-valued, which are given in purely combinatorial terms. These invariants allow one to classify the tilings with respect to certain elementary moves, flips and trits. In this paper we present a construction associating a divergence-free vector field $\xi_t$ to any domino tiling $t$, such that the flux of the tiling $t$ can be interpreted as the (relative) rotation class of the field $\xi_t$, while the twist of $t$ is proved to be the relative helicity of the field $\xi_t$.
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