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arXiv 1205.2676math.AG
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关于曲线上的对数联络

On the logarithmic connections over curves

Indranil Biswas, Viktoria Heu

摘要:

研究光滑复射影曲线上对数联络模空间上的两种不同作用。首先,我们建立了商曲线上对数轨道联络和抛物对数联络的字典。其次,证明了在有穷级线丛作用下联络的模空间上的不动点,正是对数联络在基曲线的某个非分歧Galois覆盖上的推进。在互质的情况下,有穷级线丛在模空间上的作用是上同调平凡的。

英文摘要:

We study two different actions on the moduli spaces of logarithmic connections over smooth complex projective curves. Firstly, we establish a dictionary between logarithmic orbifold connections and parabolic logarithmic connections over the quotient curve. Secondly, we prove that fixed points on the moduli space of connections under the action of finite order line bundles are exactly the push-forward of logarithmic connections on a certain unramified Galois cover of the base curve. In the coprime case, this action of finite order line bundles on the moduli space is cohomologically trivial.

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