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arXiv 1106.0873math.DG
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拟投射流形上有限体积完备Kahler度量的渐近性

Asymptotics of complete Kahler metrics of finite volume on quasiprojective manifolds

Frédéric Rochon, Zhou Zhang

摘要:

设X是由光滑射影流形$\bX$中具有正规交叉的因子$\bD$的补给出的拟射影流形.利用$X$通过角流形$\tX$的自然紧化,我们描述了X上有限体积的完全Kahler度量在无穷远处的完全渐近行为.当这些指标的里奇流的发展,我们证明了这种渐近行为持续在以后的时间显示相关的势函数是光滑的紧化$\tX$的边界。然而,当除数$\bD$是光滑的$K_{\bX}+[\bD]>0$和里奇流收敛到一个Kahler-Einstein度量,我们表明,这个Kahler-Einstein度量有一个相当不同的渐近行为在无穷远,因为它的相关的势函数是多齐次的,在一般情况下,一些对数项发生在其扩展的边界。

英文摘要:

Let X be a quasiprojective manifold given by the complement of a divisor $\bD$ with normal crossings in a smooth projective manifold $\bX$. Using a natural compactification of $X$ by a manifold with corners $\tX$, we describe the full asymptotic behavior at infinity of certain complete Kahler metrics of finite volume on X. When these metrics evolve according to the Ricci flow, we prove that such asymptotic behaviors persist at later time by showing the associated potential function is smooth up to the boundary on the compactification $\tX$. However, when the divisor $\bD$ is smooth with $K_{\bX}+[\bD]>0$ and the Ricci flow converges to a Kahler-Einstein metric, we show that this Kahler-Einstein metric has a rather different asymptotic behavior at infinity, since its associated potential function is polyhomogeneous with in general some logarithmic terms occurring in its expansion at the boundary.

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