Wall crossing for K-moduli spaces of plane curves.

Wall crossing for K-moduli spaces of plane curves.
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平面曲线 K 模空间的壁交叉。

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发表时间:
2019
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影响因子:
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通讯作者:
Yuchen Liu
Yuchen Liu
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作者:
Kenneth Ascher;Kristin Devleming;Yuchen Liu

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我们构造适当的好模空间参数化的K-polystable $\mathbb{Q}$-Gorenstein smoothable log Fano对$(X,cD)$,其中$X$是Fano簇,$D$是反典型因子的有理倍数.然后,我们建立了这些K-模空间作为$c$变化的跨壁框架。本文的主要应用是$d \geq 4$次平面曲线作为$\mathbb{P}^2$的边界因子的情况。在这种情况下,我们表明,当系数$c$是小的,这些对的K-模空间是同构的GIT模空间。然后,我们证明了这些K-模空间的第一壁交叉是Kirwan型的加权爆破。我们还描述了所有的4,5,6度的壁交叉,并将最终的K-模空间与Hacking紧化和K3曲面的模联系起来。
We construct proper good moduli spaces parametrizing K-polystable $\mathbb{Q}$-Gorenstein smoothable log Fano pairs $(X, cD)$, where $X$ is a Fano variety and $D$ is a rational multiple of the anti-canonical divisor. We then establish a wall-crossing framework of these K-moduli spaces as $c$ varies. The main application in this paper is the case of plane curves of degree $d \geq 4$ as boundary divisors of $\mathbb{P}^2$. In this case, we show that when the coefficient $c$ is small, the K-moduli space of these pairs is isomorphic to the GIT moduli space. We then show that the first wall crossing of these K-moduli spaces are weighted blow-ups of Kirwan type. We also describe all wall crossings for degree 4,5,6, and relate the final K-moduli spaces to Hacking's compactification and the moduli of K3 surfaces.
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