For R-ball convex bodies, the volume lost by the R-ball floating body at scale δ behaves like δ^{2/(n+1)} times an integral of (κ_i - 1/R)^{1/(n+1)} over the boundary, defining a rigid-motion invariant valuation.
Random polytopes in convex bodies: Bridging the gap between extremal containers
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abstract
We investigate the asymptotic properties of random polytopes arising as convex hulls of $n$ independent random points sampled from a family of block-beta distributions. Notably, this family includes the uniform distribution on a product of Euclidean balls of varying dimensions as a key example. As $n\to\infty$, we establish explicit growth rates for the expected number of facets, which depend in a subtle way on the the underlying model parameters. For the case of the uniform distribution, we further examine the expected number of faces of arbitrary dimensions as well as the volume difference. Our findings reveal that the family of random polytopes we introduce exhibits novel interpolative properties, bridging the gap between the classical extremal cases observed in the behavior of random polytopes within smooth versus polytopal convex containers.
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math.MG 1years
2025 1verdicts
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Floating bodies for ball-convex bodies
For R-ball convex bodies, the volume lost by the R-ball floating body at scale δ behaves like δ^{2/(n+1)} times an integral of (κ_i - 1/R)^{1/(n+1)} over the boundary, defining a rigid-motion invariant valuation.