中文

特殊测试配置与 Fano 簇的 $K$-稳定性

代数几何 2013-10-15 v3 微分几何

摘要

对于任意平坦射影族 (\mX,\mL)C(\mX,\mL)\rightarrow C,若其一般纤维 \mXη\mX_\eta 是 klt Q-Fano 簇且 \mL\mXηQKXη\mL|_{\mX_\eta}\sim_{Q}-K_{X_{\eta}},我们使用来自极小模型纲领 (MMP) 的技术来修改全族。最终得到的族使得每条纤维均为 klt Q-Fano 簇。此外,我们可以证明所出现模型的 Donaldson-Futaki 不变量是递减的。当该族是固定 Fano 簇 (X,KX)(X,-K_X) 的一个测试配置时,这蕴含了 Tian 猜想:给定 Fano 流形 XX,为测试其 K-(半, 多)稳定性,只需在特殊测试配置上进行测试。

关键词

引用

@article{arxiv.1111.5398,
  title  = {Special test configurations and $K$-stability of Fano varieties},
  author = {Chi Li and Chenyang Xu},
  journal= {arXiv preprint arXiv:1111.5398},
  year   = {2013}
}

备注

v3: Final version. To appear Annals of Mathematics. v2: 26 pages. The restriction that Picard number of the Fano variety equals one is removed by proving general facts on the Q-Fano degeneration of a (punctured) family of Q-Fano varieties. So a full version of Tian's conjecture is proved. The calculation on the decreasing of Donaldson-Futaki intersection number is streamlined