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arXiv 1809.08693math.NT
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Dwork曲面的Neron-Severi群上的Galois作用

Galois action on the Neron-Severi group of Dwork surfaces

Lian Duan

摘要:

研究了数域$F$中参数为$λ$的Dwrok曲面$X_λ:X_0^4+X_1^4+X_2^4+X_3^4-4λX_0X_1X_2X_3=0$的Galois作用量.证明了当$X_λ$具有几何Picard数$19$时,它的Néron-Severi群$NS(\overline{X}_λ)\otimes \mathbb{Q}$是二次特征标的直和.我们在文章中提供了两个证明这个结论。特别地,几何证明确定了每个二次特征标的导体。我们的结果与\cite{Voight2}中的结果一致。利用这种分解,我们给出了Wan的一个结果的另一个证明.

英文摘要:

We study the Galois action attached to the Dwrok surfaces $X_λ:X_0^4+X_1^4+X_2^4+X_3^4-4λX_0X_1X_2X_3=0$ with parameter $λ$ in a number field $F$. We show that when $X_λ$ has geometric Picard number $19$, its Néron-Severi group $NS(\overline{X}_λ)\otimes \mathbb{Q}$ is a direct sum of quadratic characters. We provide two proofs to this conclusion in our article. In particular, the geometrically proof determines the conductor of each of quadratic characters. Our result matches the one in \cite{Voight2}. With this decomposition, we give another proof to a result of Wan.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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