Néron models of jacobians over base schemes of dimension greater than 1
Abstract
We investigate to what extent the theory of Néron models of jacobians and of abel–jacobi maps extends to relative curves over base schemes of dimension greater than 1. We give a necessary and sufficient criterion for the existence of a Néron model. We use this to show that, in general, Néron models do not exist even after making a modification or even alteration of the base. On the other hand, we show that Néron models do exist outside some codimension-2 locus.

