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arXiv 0808.0695math.AGmath.AC
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有限域上的Hilbert第十四问题和关于曲线锥的一个猜想

Hilbert's fourteenth problem over finite fields, and a conjecture on the cone of curves

Burt Totaro

摘要:

我们给出的例子,在任意领域的环的不变量,不产生的。所涉及的群可以小到加法群的三个副本,就像向井在复数上的例子一样。有限生成的失效来自于某些椭圆纤维化或具有正Mordell-Weil秩的阿贝尔表面纤维化。我们的工作建议推广的Morrison-Kawamata锥猜想从Calabi-Yau品种klt Calabi-Yau对。在极小有理椭圆曲面的情形下证明了二维猜想。

英文摘要:

We give examples over arbitrary fields of rings of invariants that are not finitely generated. The group involved can be as small as three copies of the additive group, as in Mukai's examples over the complex numbers. The failure of finite generation comes from certain elliptic fibrations or abelian surface fibrations having positive Mordell-Weil rank. Our work suggests a generalization of the Morrison-Kawamata cone conjecture from Calabi-Yau varieties to klt Calabi-Yau pairs. We prove the conjecture in dimension 2 in the case of minimal rational elliptic surfaces.

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