Concentration conjecture for separating systoles of random triangulations

From papers

Fix θ(0,1/2)\theta\in(0,1/2) and a sequence (gn)(g_n) such that gn/nθg_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 nn\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.

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Sources & referencesView supporting material

Primary source

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

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