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arXiv 0905.2870math.AGmath.CV
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半稳定和数值有效的主(Higgs)丛

Semistable and numerically effective principal (Higgs) bundles

Ugo Bruzzo, Beatriz Graña Otero

摘要:

研究了复射影流形上主Higgs G-丛E的Miyaoka型半稳定性准则。我们证明了E具有拉回到任意射影曲线后半稳定的性质当且仅当由G的抛物子群的某些特征得到的某些线丛是数值有效的。还证明了这些条件满足半稳定的主希格斯丛的伴随丛有消失的第二陈类。在本文的第二部分中,我们介绍了主(希格斯)束的数值有效性和数值平坦性的概念,讨论了它们的主要性质。对于(非Higgs)主丛,我们证明了一个数值平坦的主丛可以约化到一个具有平坦Hermitian-Yang-Mills联络的Levi因子,并且,作为结果,一个数值平坦的实系数主丛的上同调环是平凡的.据我们所知,即使在(非希格斯)主丛的情况下,这种数值有效性的概念也是新的。

英文摘要:

We study Miyaoka-type semistability criteria for principal Higgs G-bundles E on complex projective manifolds of any dimension. We prove that E has the property of being semistable after pullback to any projective curve if and only if certain line bundles, obtained from some characters of the parabolic subgroups of G, are numerically effective. One also proves that these conditions are met for semistable principal Higgs bundles whose adjoint bundle has vanishing second Chern class. In a second part of the paper, we introduce notions of numerical effectiveness and numerical flatness for principal (Higgs) bundles, discussing their main properties. For (non-Higgs) principal bundles, we show that a numerically flat principal bundle admits a reduction to a Levi factor which has a flat Hermitian-Yang-Mills connection, and, as a consequence, that the cohomology ring of a numerically flat principal bundle with real coefficients is trivial. To our knowledge this notion of numerical effectiveness is new even in the case of (non-Higgs) principal bundles.

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