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Models of Jacobians of curves

Published version

Published version
Peer-reviewed

Repository DOI


Change log

Authors

Molcho, Sam 
Orecchia, Giulio 
Poiret, Thibault 

Abstract

jats:titleAbstract</jats:title> jats:pWe show that the Jacobians of prestable curves over toroidal varieties always admit Néron models. These models are rarely quasi-compact or separated, but we also give a complete classification of quasi-compact separated group-models of such Jacobians. In particular, we show the existence of a maximal quasi-compact separated group model, which we call the saturated model, and has the extension property for all torsion sections. The Néron model and the saturated model coincide over a Dedekind base, so the saturated model gives an alternative generalization of the classical notion of Néron models to higher-dimensional bases; in the general case we give necessary and sufficient conditions for the Néron model and saturated model to coincide. The key result, from which most others descend, is that the logarithmic Jacobian of [S. Molcho and J. Wise, The logarithmic Picard group and its tropicalization, preprint 2018] is a log Néron model of the Jacobian.</jats:p>

Description

Peer reviewed: True

Keywords

4904 Pure Mathematics, 49 Mathematical Sciences

Journal Title

Journal für die reine und angewandte Mathematik (Crelles Journal)

Conference Name

Journal ISSN

0075-4102
1435-5345

Volume Title

2023

Publisher

Walter de Gruyter GmbH