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arXiv math/0005132math.AG
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Higgs束的几何性质

The gerbe of Higgs bundles

R. Donagi, D. Gaitsgory

摘要:

本文的目的是描述复概型X上的Higgs丛(类),复概型X具有给定的相机覆盖X~。证明了这个范畴是一个T_{X~} -格贝,其中T_{X~}是X上的某个阿贝尔群层,并精确地刻画了这个格贝的类.特别地,可以得出这样的结论:具有固定相机覆盖X~的Higgs丛的同构类集合是群H ^1(X,T_{X~})上的torsor,它本身将X上的T_{X~} -torsor参数化。这个基础群可以被描述为广义Prym簇,其连通分支是阿贝尔簇或其退化簇。

英文摘要:

The purpose of this work is to describe the (category of) Higgs bundles on a complex scheme X having a given cameral cover X~. We show that this category is a T_{X~}-gerbe, where T_{X~} is a certain sheaf of abelian groups on X, and we describe the class of this gerbe precisely. In particular, it follows that the set of isomorphism classes of Higgs bundles with a fixed cameral cover X~ is a torsor over the group H^1(X, T_{X~}), which itself parametrizes T_{X~}-torsors on X. This underlying group can be described as a generalized Prym variety, whose connected component is either an abelian variety or a degeneration thereof.

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