Uniformization of Deligne-Mumford curves

Details Uniformization of Deligne-Mumford curves Uniformization of Deligne-Mumford curves

2005-04-14

arxiv.org/abs/math/0504309v1

Mathematics

Algebraic Geometry

39 pages, 2 figures

Scientific paper

We compute the fundamental groups of non-singular analytic Deligne-Mumford curves, classify the simply connected ones, and classify analytic Deligne-Mumford curves by their uniformization type. As a result, we find an explicit presentation of an arbitrary Deligne-Mumford curve as a quotient stack. Along the way, we compute the automorphism 2-groups of weighted projective stacks $\mathcal{P}(n_1,n_2,...,n_r)$. We also discuss connections with the theory of F-groups, 2-groups, and Bass-Serre theory of graphs of groups.

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