Fano $G$ -流形上里奇流的时对称极限
Horosymmetric limits of Kähler-Ricci flow on Fano $G$-manifolds
摘要：
本文证明了在Fano $\mathbf G$ -流形$(M,J)$上，初始度量为$2πc_1(M)$的Kähler-里奇流的Gromov-Hausdorff极限必须是一个允许奇异Kähler-Ricci孤子的$\mathbb Q$ -Fano次对称簇$M_\infty$.此外，$M_\infty$是由$\mathbf G$的Cartan环面的李代数中的元素引起的$M$的$\mathbb C^*$ -退化的极限.对于任意Fano时对称流形上的Kähler-Ricci流也可以证明类似的结果。作为应用，我们将Fano $\mathbf G$ -流形上Kähler-Ricci流的II型奇异性推广到了Fano次对称流形上.
英文摘要：
In this paper, we prove that on a Fano $\mathbf G$-manifold $(M,J)$, the Gromov-Hausdorff limit of Kähler-Ricci flow with initial metric in $2πc_1(M)$ must be a $\mathbb Q$-Fano horosymmetric variety $M_\infty$, which admits a singular Kähler-Ricci soliton. Moreover, $M_\infty$ is a limit of $\mathbb C^*$-degeneration of $M$ induced by an element in the Lie algebra of Cartan torus of $\mathbf G$. A similar result can be also proved for Kähler-Ricci flows on any Fano horosymmetric manifolds. As an application, we generalize our previous result about the type II singularity of Kähler-Ricci flows on Fano $\mathbf G$-manifolds to Fano horosymmetric manifolds.
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