The homological connectivity threshold conjecture for k-fold coverage

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Let Br(k)B_r^{(k)} be the kk-fold coverage complex on the dd-dimensional torus, let Hi,r(k){\cal{H}}_{i,r}^{(k)} be the event that Hi(Bs(k))≅Hi(Td)H_i(B_s^{(k)})\cong H_i({\mathbb{T}}^d) for every s≥rs\geq r, and let Λ\Lambda be the model's intensity parameter. Let k≥1k\geq 1 and 0≤i≤d−20\leq i\leq d-2, and suppose that w(n)→∞w(n)\rightarrow\infty as n→∞n\rightarrow\infty.

Homological connectivity threshold conjecture.

lim⁡n→∞P(Hi,r(k))={1Λ=log⁡n+(i+k−2)log⁡log⁡n+w(n),0Λ=log⁡n+(i+k−2)log⁡log⁡n−w(n).\lim_{n\rightarrow\infty}\mathbb{P}({\cal{H}}_{i,r}^{(k)}) = \begin{cases} 1 & \Lambda = \log n + (i+k-2)\log\log n + w(n), \\ 0 & \Lambda = \log n + (i+k-2)\log\log n - w(n). \end{cases}

The preceding corollary gives only an upper bound for these homological connectivity thresholds, while the conjecture is motivated by the homological connectivity results of Bobrowski (2022).

References

Primary source

Yohai Reani and Omer Bobrowski, “Sharp Phase Transitions for k-Fold Coverage Using Morse Theory”, arXiv:2510.20329 (2025).

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