Moduli of certain wild covers of curves
Abstract
A fine moduli space is constructed, for cyclic-by- covers of an affine curve over an algebraically closed field of characteristic . An intersection of finitely many fine moduli spaces for cyclic-by- covers of affine curves gives a moduli space for -by- covers of an affine curve. A local moduli space is also constructed, for cyclic-by- covers of , which is the same as the global moduli space for cyclic-by- covers of tamely ramified over with the same Galois group. Then it is shown that a restriction morphism is finite with degrees on connected components powers: There are finitely many deleted points of an affine curve from its smooth completion. A cyclic-by- cover of an affine curve gives a product of local covers with the same Galois group of the punctured infinitesimal neighbourhoods of the deleted points. So there is a restriction morphism from the global moduli space to a product of local moduli spaces.
Keywords
Cite
@article{arxiv.1904.03763,
title = {Moduli of certain wild covers of curves},
author = {Jianru Zhang},
journal= {arXiv preprint arXiv:1904.03763},
year = {2019}
}
Comments
some typos corrected and minor changes made