Pointed-collection conjecture for finite quotients of tame fundamental groups

Let Mg,nordM_{g,n}^{\rm ord} be the ordinary moduli space, let qgenq_{\rm gen} be its generic point, and let πAt(q)\pi_A^{\rm t}(q) denote the set of finite quotients associated with the tame fundamental group at qq. For each closed point tt, define Ct={GπAt(qgen)tUG}\mathcal{C}_t=\{G\in\pi_A^{\rm t}(q_{\rm gen})\mid t\in U_G\}, and let Cq\mathscr{C}_q be the set of pointed collections contained in πAt(q)\pi_A^{\rm t}(q). Pointed-collection conjecture. For each tMg,nord,clt\in M_{g,n}^{\rm ord,cl}, Ct\mathcal{C}_t is a pointed collection; moreover, for every qMg,nordq\in M_{g,n}^{\rm ord}, the natural map

colleq:VqclCq,[t]Ct,{\rm colle}_{q}:\mathscr{V}_{q}^{\rm cl}\longrightarrow\mathscr{C}_{q},\qquad [t]\longmapsto\mathcal{C}_{t},

where Vqcl:=Vqcl/fe\mathscr{V}_{q}^{\rm cl}:=V_q^{\rm cl}/\sim_{fe}, is a bijection. The conjecture is intended to reconstruct group-theoretically the finite quotients of closed points of VqV_q from πAt(q)\pi_A^{\rm t}(q), but the source gives no resolution.

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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