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arXiv 1502.06258math.AGmath.DGmath.GT
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光滑环面紧化的典范除子

On the canonical divisor of smooth toroidal compactifications

Gabriele Di Cerbo, Luca F. Di Cerbo

摘要:

本文证明了复双曲流形的光滑环面紧化的典范除子必是nef,如果维数大于或等于3。此外,如果$n\geq 3$,我们证明了光滑$n$ -维紧化的典范除子的数值维数总是大于或等于$n-1$ .我们还表明,直到有限的étale覆盖所有这样的紧化有充足的典型类,从而完善了经典定理的芒福德和泰。最后,我们在所有维上改进了文献[DD 15 a]中给出的有限体积复双曲流形的尖点计数$n\geq 3$.

英文摘要:

In this paper, we show that the canonical divisor of a smooth toroidal compactification of a complex hyperbolic manifold must be nef if the dimension is greater or equal to three. Moreover, if $n\geq 3$ we show that the numerical dimension of the canonical divisor of a smooth $n$-dimensional compactification is always bigger or equal to $n-1$. We also show that up to a finite étale cover all such compactifications have ample canonical class, therefore refining a classical theorem of Mumford and Tai. Finally, we improve in all dimensions $n\geq 3$ the cusp count for finite volume complex hyperbolic manifolds given in [DD15a].

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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