光滑射影四维簇的同胚类型
代数几何
2018-10-12 v3
摘要
在本文中,我们研究拓扑等价的光滑复射影-簇。首先我们证明Fano四维簇永远不会与Ricci平坦射影四维簇定向同胚,并且维数的Calabi-Yau流形与超凯勒(hyperk"ahler)流形永远不会定向同胚。最后,我们给出与超凯勒四维簇定向同胚的光滑射影四维簇的粗略分类,该超凯勒四维簇形变等价于射影K3曲面的两点Hilbert概型。我们还给出了一个与定向同胚且具有正Kodaira维数的光滑射影四维簇的显式例子。
引用
@article{arxiv.1707.05657,
title = {On the homeomophism type of smooth projective fourfolds},
author = {Keiji Oguiso and Thomas Peternell},
journal= {arXiv preprint arXiv:1707.05657},
year = {2018}
}
备注
Correction of an error (exotic structure for certain Hk 4-fold was wrongly stated in the previous version, now added as an open problem), submitted