Existence of short simple separating cycles in random high-genus 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. A simple separating non-contractible cycle is a simple cycle that is separating and non-contractible. The short simple separating cycle conjecture. For every θ∈(0,1/2)\theta\in(0,1/2), there exists a constant KK such that, with high probability, T2n,gn\mathbf{T}_{2n,g_n} contains a simple, non-contractible, separating cycle of length less than Klog⁡(n)K\log(n).

The theorem preceding this conjecture proves only logarithmic upper and lower bounds for the unrestricted separating systole. This conjecture would establish a logarithmically short simple separating cycle in the random model, despite the deterministic existence problem remaining open.

References

Primary source

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

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