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arXiv 1209.5591math.AGmath.NT
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模空间与三次曲面的Galois逆问题

Moduli spaces and the inverse Galois problem for cubic surfaces

Andreas-Stephan Elsenhans, Jörg Jahnel

摘要:

研究了标记三次曲面的模空间$\widetilde{\calM}$。通过A.\,B. Coble,这有一个紧化$\widetilde{M}$,它被群$W(E_6)$线性作用。$\widetilde{M}$是$\bP^9$中30个立方的交集。对于遗忘标记的态射$\widetilde{calM} \to \bP(1,2,3,4,5)$,紧跟着Clebsch不变映射,我们给出了显式公式.即,Clebsch的不变量是用Coble的无理不变量表示的。作为应用,我们对$\bbQ$上的三次曲面的Galois反问题给出了肯定的回答.

英文摘要:

We study the moduli space $\widetilde{\calM}$ of marked cubic surfaces. By classical work of A.\,B. Coble, this has a compactification $\widetilde{M}$, which is linearly acted upon by the group $W(E_6)$. $\widetilde{M}$ is given as the intersection of 30 cubics in $\bP^9$. For the morphism $\widetilde{calM} \to \bP(1,2,3,4,5)$ forgetting the marking, followed by Clebsch's invariant map, we give explicit formulas. I.e., Clebsch's invariants are expressed in terms of Coble's irrational invariants. As an application, we give an affirmative answer to the inverse Galois problem for cubic surfaces over $\bbQ$.

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