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arXiv 1108.0967math.DGmath.AG
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交换的可压缩Calabi-Yau流形的坍缩

Collapsing of abelian fibred Calabi-Yau manifolds

Mark Gross, Valentino Tosatti, Yuguang Zhang

摘要:

本文研究了当纤维体积趋于零时,投射的卡-丘流形上的Ricci-平坦Kahler度量的坍缩行为。我们发现,远离纤维化的临界轨迹的度量崩溃与局部有界曲率,并沿纤维的重新缩放的度量变得平坦的限制。基上的极限度量减去临界轨迹局部等距于Ricci平坦度量的任何Gromov-Hausdorff极限空间的开稠密子集。然后,我们应用这些结果来研究家庭的极化超kahler流形在大复结构限制的度量退化。在这种情况下,我们证明了一个类似的结果Gross-Wilson的K3曲面,这是由斯特劳明格-丘-Zaslow图片的镜像对称的动机。

英文摘要:

We study the collapsing behaviour of Ricci-flat Kahler metrics on a projective Calabi-Yau manifold which admits an abelian fibration, when the volume of the fibers approaches zero. We show that away from the critical locus of the fibration the metrics collapse with locally bounded curvature, and along the fibers the rescaled metrics become flat in the limit. The limit metric on the base minus the critical locus is locally isometric to an open dense subset of any Gromov-Hausdorff limit space of the Ricci-flat metrics. We then apply these results to study metric degenerations of families of polarized hyperkahler manifolds in the large complex structure limit. In this setting we prove an analog of a result of Gross-Wilson for K3 surfaces, which is motivated by the Strominger-Yau-Zaslow picture of mirror symmetry.

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