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arXiv 1508.04052math.AGmath.DG
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关于$\mathbb{Q}$ -Fano簇的K-稳定性和体积函数

On K-stability and the volume functions of $\mathbb{Q}$-Fano varieties

Kento Fujita

摘要:

我们引入了Fano流形的一种新的有效稳定性,称为“因子稳定性”,它比K-稳定性弱,但比沿因子的斜率稳定性强。我们表明,我们可以通过体积函数测试除数稳定性。作为推论,我们证明了对任何Kähler-Einstein Fano流形,反正则因子的Okounkov体重心的第一坐标不大于1.特别地,对于复曲面Fano流形,Kähler-Einstein度量的存在性等价于除数半稳定性。此外,我们还发现了许多三维的非Kähler-Einstein Fano流形。

英文摘要:

We introduce a new effective stability named "divisorial stability" for Fano manifolds which is weaker than K-stability and is stronger than slope stability along divisors. We show that we can test divisorial stability via the volume function. As a corollary, we prove that the first coordinate of the barycenter of the Okounkov body of the anticanonical divisor is not bigger than one for any Kähler-Einstein Fano manifold. In particular, for toric Fano manifolds, the existence of Kähler-Einstein metrics is equivalent to divisorial semistability. Moreover, we find many non-Kähler-Einstein Fano manifolds of dimension three.

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