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arXiv 2006.15752math.DG
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关于渐近锥Calabi-Yau度量的退化

On the degeneration of asymptotically conical Calabi-Yau metrics

Tristan C. Collins, Bin Guo, Freid Tong

摘要:

研究了渐近锥Ricci平坦Kähler度量在Kähler类退化为半正类时的退化.我们证明了在适当的假设下,Ricci-平坦Kähler度量收敛到一个不完全光滑的Ricci-平坦Kähler度量。因此,我们在某些拟射影簇上构造了在无穷远处具有渐近锥行为的奇异Calabi-Yau度量,并证明了这些奇异度量的度量几何与奇异簇的拓扑同胚.最后,我们将应用我们的结果来研究几类例子的几何转换之间的Calabi-Yau流形。

英文摘要:

We study the degenerations of asymptotically conical Ricci-flat Kähler metrics as the Kähler class degenerates to a semi-positive class. We show that under appropriate assumptions, the Ricci-flat Kähler metrics converge to a incomplete smooth Ricci-flat Kähler metric away from a compact subvariety. As a consequence, we construct singular Calabi-Yau metrics with asymptotically conical behaviour at infinity on certain quasi-projective varieties and we show that the metric geometry of these singular metrics are homeomorphic to the topology of the singular variety. Finally, we will apply our results to study several classes of examples of geometric transitions between Calabi-Yau manifolds.

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