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arXiv 0706.0690math.AG
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厄米向量丛的张量积的最大斜率

Maximal slope of tensor product of Hermitian vector bundles

Huayi Chen

摘要:

给出了代数整数环谱上多个非零厄米向量丛的张量积的最大斜率的一个上界。利用Minkowski定理,我们需要估计张量积的任意厄米线子丛$\bar M$的Arakelov度.在$M$的类纤维在几何不变理论意义下是半稳定的情况下,通过经典不变理论构造一个在$M$的类纤维上不为零的特殊多项式来建立估计.否则,我们使用Ramanan和Ramanathan的结果的显式版本,以减少前一个一般情况。

英文摘要:

We give an upper bound for the maximal slope of the tensor product of several non-zero Hermitian vector bundles on the spectrum of an algebraic integer ring. By Minkowski's theorem, we need to estimate the Arakelov degree of an arbitrary Hermitian line subbundle $\bar M$ of the tensor product. In the case where the generic fiber of $M$ is semistable in the sense of geometric invariant theory, the estimation is established by constructing, through the classical invariant theory, a special polynomial which does not vanish on the generic fibre of $M$. Otherwise we use an explicte version of a result of Ramanan and Ramanathan to reduce the general case to the former one.

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