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arXiv 0909.1849math.AGmath.NT
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Jacobians的Néron模型的典范扩张

Canonical extensions of Néron models of Jacobians

Bryden Cais

摘要:

设A是离散赋值环R的分式域K上的交换阿贝尔簇A_K的Néron模型.由于Mazur-Messing的工作,有一种函子方法可以将A_K的泛扩张通过一个向量群延拓为R上的一个光滑的分离群概型,称为A_K的典范扩张。本文研究了K上光滑的真几何连通曲线X_K的雅可比行列式为A_K=J_K时的标准扩张。设X_K是R上的一个真平坦正则模型X,且X上有一般光滑的闭纤维,我们的主要结果是确定了正则扩张的单位连通区,其中Pic^{ \natural,0}_{X/R}对X上的线丛进行了分类,这些线丛在几何纤维的所有分支上都有部分度零,并且具有正则联络.这个结果是雷诺定理的一个自然扩张,该定理将J_K的Néron模型J的单位连通区与函子Pic ^0_{X/R}等同起来。作为结果的一个应用,我们证明了X_K的de Rham上同调上的两个典型积分结构之间的比较同构。

英文摘要:

Let A be the Néron model of an abelian variety A_K over the fraction field K of a discrete valuation ring R. Due to work of Mazur-Messing, there is a functorial way to prolong the universal extension of A_K by a vector group to a smooth and separated group scheme over R, called the canonical extension of A. In this paper, we study the canonical extension when A_K=J_K is the Jacobian of a smooth proper and geometrically connected curve X_K over K. Assuming that X_K admits a proper flat regular model X over R that has generically smooth closed fiber, our main result identifies the identity component of the canonical extension with a certain functor Pic^{\natural,0}_{X/R} classifying line bundles on X that have partial degree zero on all components of geometric fibers and are equipped with a regular connection. This result is a natural extension of a theorem of Raynaud, which identifies the identity component of the Néron model J of J_K with the functor Pic^0_{X/R}. As an application of our result, we prove a comparison isomorphism between two canonical integral structures on the de Rham cohomology of X_K.

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