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arXiv math/9910118math.AG
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Fano轨道上复奇性指数和Kähler-Einstein度量的半连续性

Semi-continuity of complex singularity exponents and Kähler-Einstein metrics on Fano orbifolds

Jean-Pierre Demailly, János Kollár

摘要:

引入了多重次调和函数的复奇性指数,并证明了其半连续性的一般结果。这个概念包含了几个类似的概念作为一个特例,这些概念已经被Arnold和Varchenko考虑过,主要用于研究超曲面奇点。多重次调和的版本在某种程度上是基于减少代数的情况下,但它也考虑到了更多的定量信息的极大兴趣,复分析和复杂的微分几何。作为一个应用程序,我们给出了一个新的推导准则的存在凯勒-爱因斯坦度量的某些法诺orbifolds,以下纳德尔的原始想法(但激烈的简化技术,一旦半连续性的结果是理所当然的)。这样,得到了3个新的具有商奇点的刚性Kähler-Einstein Del Pezzo曲面的例子.

英文摘要:

We introduce complex singularity exponents of plurisubharmonic functions and prove a general semi-continuity result for them. This concept contains as a special case several similar concepts which have been considered e.g. by Arnold and Varchenko, mostly for the study of hypersurface singularities. The plurisubharmonic version is somehow based on a reduction to the algebraic case, but it also takes into account more quantitative informations of great interest for complex analysis and complex differential geometry. We give as an application a new derivation of criteria for the existence of Kähler-Einstein metrics on certain Fano orbifolds, following Nadel's original ideas (but with a drastic simplication in the technique, once the semi-continuity result is taken for granted). In this way, 3 new examples of rigid Kähler-Einstein Del Pezzo surfaces with quotient singularities are obtained.

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