Concentration conjecture for separating systoles of random triangulations

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Fix θ∈(0,1/2)\theta\in(0,1/2) and a sequence (gn)(g_n) such that gn/n→θg_n/n\rightarrow\theta. Let T2n,gn\mathbf{T}_{2n,g_n} be a uniform triangulation of genus gng_n with 2n2n faces. The separating systole is the length of the shortest separating non-contractible cycle, and the simple separating systole is the length of the shortest simple separating non-contractible cycle; denote them by sepsys⁡(T2n,gn)\operatorname{sepsys}(\mathbf{T}_{2n,g_n}) and sepsys⁡(T2n,gn)∗\operatorname{sepsys}(\mathbf{T}_{2n,g_n})^*, respectively. Separating systole concentration conjecture. For every θ∈(0,1/2)\theta\in(0,1/2), there exist constants 0<S(θ)<S∗(θ)0<S(\theta)<S^*(\theta) such that

sepsys⁡(T2n,gn)log⁡(n)→S(θ)andsepsys⁡(T2n,gn)∗log⁡(n)→S∗(θ)\frac{\operatorname{sepsys}(\mathbf{T}_{2n,g_n})}{\log(n)}\rightarrow S(\theta)\quad\text{and}\quad\frac{\operatorname{sepsys}(\mathbf{T}_{2n,g_n})^*}{\log(n)}\rightarrow S^*(\theta)

in probability as n→∞n\rightarrow\infty.

The preceding result gives only logarithmic-order bounds for the separating systole. This conjecture predicts limiting constants and that the simple separating systole is strictly larger asymptotically.

References

Primary source

Baptiste Louf, “The separating systole and the genus ratio of high genus triangulations”, arXiv:2512.05068 (2025).

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