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arXiv 0905.0019math.NT
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关于阿贝尔簇的自同态环的有限性

On finiteness of endomorphism rings of abelian varieties

Chia-Fu Yu

摘要:

阿贝尔簇A的自同态环End(A)是Q上半单代数中的序. End(A)的余指标是包含它的极大序模的指标,本文证明了特征p>0的任意代数闭域上的固定维数的阿贝尔簇,其自同态环的余指标的p-指数是有界的.我们也给出了这个有限性结果的一些应用。

英文摘要:

The endomorphism ring End(A) of an abelian variety A is an order in a semi-simple algebra over Q. The co-index of End(A) is the index to a maximal order containing it. We show that for abelian varieties of fixed dimension over any algebraically closed field of characteristic p>0, the p-exponents of the co-indices of their endomorphism rings are bounded. We also give a few applications to this finiteness result.

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