arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2008.00592math.GTmath.AGmath.ATmath.DGmath.GR
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几何结构、Gromov序、Kodaira维数和单纯体积

Geometric structures, the Gromov order, Kodaira dimensions and simplicial volume

Christoforos Neofytidis, Weiyi Zhang

摘要:

我们引入了一个公理化的定义Kodaira尺寸和分类瑟斯顿几何尺寸$\leq 5$在此Kodaira尺寸。我们证明了Kodaira维数关于5-流形之间的非零次映射所定义的偏序是单调的。我们研究的兼容性,我们的定义与传统观念的Kodaira尺寸,特别是最高可能Kodaira尺寸。为此,我们建立了单纯体积和全纯Kodaira维数之间的联系,这特别意味着任何具有非零单纯体积的光滑Kähler 3-fold都具有顶全纯Kodaira维数。

英文摘要:

We introduce an axiomatic definition for the Kodaira dimension and classify Thurston geometries in dimensions $\leq 5$ in terms of this Kodaira dimension. We show that the Kodaira dimension is monotone with respect to the partial order defined by maps of non-zero degree between 5-manifolds. We study the compatibility of our definition with traditional notions of Kodaira dimension, especially the highest possible Kodaira dimension. To this end, we establish a connection between the simplicial volume and the holomorphic Kodaira dimension, which in particular implies that any smooth Kähler 3-fold with non-vanishing simplicial volume has top holomorphic Kodaira dimension.

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