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arXiv 1003.2873math.AG
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辛迷向Grassmannian上向量丛的分裂准则

Splitting criteria for vector bundles on the symplectic isotropic Grassmannian

Pedro Macias Marques, Luke Oeding

摘要:

本文将Ottaviani关于Grassmannian上向量丛的上同调分裂准则的一个定理推广到辛迷向Grassmannian上.我们找到了辛迷向直线的Grassmanian的充要条件。在一般情况下,推广的Ottaviani条件对于辛迷向格拉斯曼上的向量丛是充分的。通过LiE程序的计算,我们发现Ottaviani条件对于各向同性$k\leq 6$-平面的Lagrangian Grassmannian是必要的,而对于各向同性7-平面的Lagrangian Grassmannian则不是必要的.最后,我们找到了一组相关的必要和充分的拉格朗日格拉斯曼分裂准则。

英文摘要:

We extend a theorem of Ottaviani on cohomological splitting criterion for vector bundles over the Grassmannian to the case of the symplectic isotropic Grassmanian. We find necessary and sufficient conditions for the case of the Grassmanian of symplectic isotropic lines. For the general case the generalization of Ottaviani's conditions are sufficient for vector bundles over the symplectic isotropic Grassmannian. By a calculation in the program LiE, we find that Ottaviani's conditions are necessary for Lagrangian Grassmannian of isotropic $k$-planes for $k\leq 6$, but they fail to be necessary for the case of the Lagrangian Grassmannian of isotropic 7-planes. Finally, we find a related set of necessary and sufficient splitting criteria for the Lagrangian Grassmannian.

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