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arXiv 1003.5285math.AGmath.DG
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实代数曲线上向量丛粗模格式的实点

Real points of coarse moduli schemes of vector bundles on a real algebraic curve

Florent Schaffhauser

摘要:

研究了具有固定实结构的光滑复射影曲线上的实和四元数向量丛的模问题,并给出了具有固定拓扑型的半稳定向量丛的模空间的规范理论构造.这些空间嵌入到一个复射影簇内实点的连通子集上。我们将我们的观点与以前的工作Biswas,Huisman和Hurtubise(arxiv:0901.3071),我们用它来研究的伽罗瓦行动引起的模品种的稳定全纯丛的复杂曲线上的曲线上的一个给定的真实结构。我们特别展示了一个Harnack型定理,该定理定义了$2^g +1$作用的不动点集的连通分量的数目,其中$g$是曲线的属。事实上,考虑到所有的拓扑不变量的真实结构,我们给出了一个确切的计数的数量连接组件,从而概括排名$r > 1$的结果格罗斯和哈里斯的皮卡德计划的一个真正的代数曲线。

英文摘要:

We examine a moduli problem for real and quaternionic vector bundles on a smooth complex projective curve with a fixed real structure, and we give a gauge-theoretic construction of moduli spaces for semi-stable such bundles with fixed topological type. These spaces embed onto connected subsets of real points inside a complex projective variety. We relate our point of view to previous work by Biswas, Huisman and Hurtubise (arxiv:0901.3071), and we use this to study the Galois action induced on moduli varieties of stable holomorphic bundles on a complex curve by a given real structure on the curve. We show in particular a Harnack-type theorem, bounding the number of connected components of the fixed-point set of that action by $2^g +1$, where $g$ is the genus of the curve. In fact, taking into account all the topological invariants of the real structure, we give an exact count of the number of connected components, thus generalising to rank $r > 1$ the results of Gross and Harris on the Picard scheme of a real algebraic curve.

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