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arXiv · 2506.06885

The Dimension-Shift Category and Its Mellin-Gamma Representation

Andreu Ballus Santacana
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Abstract

We define a thin category $\mathrm{Dim}^+$ of dimension shifts and a category $\mathrm{RadMeas}$ of positive Radon measures with Radon--Nikodym density morphisms. We classify scaling-covariant functors $\mathrm{Dim}^+\to\mathrm{RadMeas}$ whose morphisms are given by homogeneous densities. Gaussian normalization selects a unique functor with values $ dμ_x(u)=\frac{π^{x/2}}{Γ(x/2)}u^{x/2-1}\,du. $ Its morphism component yields the radial-integration transport $ R(x,r)=\frac{π^rΓ(x/2)}{Γ(x/2+r)}, $ while the unit-interval observable recovers the Euclidean ball-volume formula $ V(x)=\frac{π^{x/2}}{Γ(x/2+1)}. $ The two transports differ by the multiplicative coboundary of $β(x)=x$, identified with the categorical dimension of the standard object in Deligne's interpolation category $\mathrm{Rep}(O_t)$.

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Andreu Ballus Santacana. 2026-05-10. The Dimension-Shift Category and Its Mellin-Gamma Representation. https://arxiv.org/abs/2506.06885

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