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On topological and combinatorial structures of pointed stable curves over algebraically closed fields of positive characteristic

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In the present paper, we study anabelian geometry of curves over algebraically closed fields of positive characteristic. Let X• = (X,DX) be a pointed stable curve over an algebraically closed… Click to show full abstract

In the present paper, we study anabelian geometry of curves over algebraically closed fields of positive characteristic. Let X• = (X,DX) be a pointed stable curve over an algebraically closed field of characteristic p > 0 and ΠX• the admissible fundamental group of X•. We prove that there exists a group-theoretical algorithm whose input datum is the admissible fundamental group ΠX• , and whose output data are the topological and the combinatorial structures associated to X•. This result can be regarded as a mono-anabelian version of the combinatorial Grothendieck conjecture in positive characteristic. Moreover, by applying this result, we construct clutching maps for moduli spaces of admissible fundamental groups.

Keywords: closed fields; positive characteristic; pointed stable; fields positive; algebraically closed; curves algebraically

Journal Title: Mathematische Nachrichten
Year Published: 2023

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