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arXiv math/9910157math.CVmath.AGmath.DG
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Nakano正性与伴随正线丛直象上的L2-metric

Nakano positivity and the L2-metric on the direct image of an adjoint positive line bundle

Indranil Biswas, Christophe Mourougane

摘要:

在典型纤维的第一贝蒂数为零的假设下,证明了伴随正线丛通过射影流形间的局部平凡浸入的直像上的$L^2$度量是Nakano正的.由此,我们得到了被其行列式张量化的充裕向量丛的对称幂是Nakano正的,特别是Griffiths正的。这反过来又给出了消灭定理和丰富的向量丛的分析特征。

英文摘要:

We prove that the $L^2$ metric on the direct image of an adjoint positive line bundle by a locally trivial submersion between projective manifolds is Nakano positive, under the assumption that the typical fiber has zero first Betti number. As a consequence, we get that the symmetric powers of an ample vector bundle tensorized by its determinant are Nakano positive, in particular Griffiths positive. This in turn gives vanishing theorems and an analytic characterization of ample vector bundles.

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