Weak Hom-version conjecture for ordinary moduli spaces of curves

Let Mg,nordM_{g,n}^{\rm ord} be the ordinary moduli space of smooth pointed stable curves, and let Mg,n,FpM_{g,n,\mathbb{F}_p} be its characteristic-pp counterpart. For arbitrary points qiMg,nq_i\in M_{g,n}, respectively qiMg,n,Fpq_i\in M_{g,n,\mathbb{F}_p}, i{1,2}i\in\{1,2\}, let VqiV_{q_i} denote the closure of qiq_i and let π1t(qi)\pi_1^{\rm t}(q_i) denote the corresponding tame fundamental group. Weak Hom-version conjecture.

Hompgop(π1t(q1),π1t(q2)){\rm Hom}^{\rm op}_{\rm pg}(\pi_{1}^{\rm t}(q_{1}),\pi_{1}^{\rm t}(q_{2}))

is non-empty if and only if Vq1feVq2V_{q_{1}}\supseteq_{fe}V_{q_{2}} in the ordinary case, respectively Vq1Vq2V_{q_{1}}\supseteq V_{q_{2}} in characteristic pp. The conjecture is intended to recover the topological structures of the moduli spaces from tame fundamental groups; the source reports no published results for non-closed points.

Sources & referencesView supporting material

Primary source

Zhi Hu, Yu Yang and Runhong Zong, “Topological Structures of Moduli Spaces of Curves and Anabelian Geometry in Positive Characteristic”, arXiv:2301.04864 (2023).

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