Borsuk–Ulam conjecture for random complexes with free involution

Let d1d\geq 1 and let α\alpha satisfy

1d+1<α<1d.\frac{1}{d+1}<\alpha<\frac{1}{d}.

Let Z~Z~(2n,nα)\widetilde Z\sim\widetilde Z(2n,n^{-\alpha}) be a random simplicial complex on 2n2n vertices with free involution ι ⁣:Z~Z~\iota\colon\widetilde Z\to\widetilde Z.

Borsuk–Ulam conjecture. With high probability, for every continuous map f ⁣:Z~R2d+1f\colon\widetilde Z\to\mathbb{R}^{2d+1}, there exists an xZ~x\in|\widetilde Z| such that

f(x)=f(ι(x)).f(x)=f(\iota(x)).

The preceding theorem proves the analogous assertion with target Rd+1\mathbb{R}^{d+1} in this probability regime, using that Z~\widetilde Z is at least dd-connected with high probability. The conjecture reflects the observation that the connectivity over the rationals is expected to be about twice as large, but the stated stronger Borsuk–Ulam property remains open.

Sources & referencesView supporting material

Primary source

Florian Frick and Andrew Newman, “Random complexes with free involution”, arXiv:2210.11316 (2022).

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