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The essential skeleton of a degeneration of algebraic varieties

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arxiv 1307.4041 v2 pith:M37JFORV submitted 2013-07-15 math.AG

Johannes Nicaise , Chenyang Xu This is my paper · ORCID
classification math.AG
keywords skeletonessentialberkovichminimalmodelvarietyalgebraicanalytification
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abstract

In this paper, we explore the connections between the Minimal Model Program and the theory of Berkovich spaces. Let $k$ be a field of characteristic zero and let $X$ be a smooth and proper $k((t))$-variety with semi-ample canonical divisor. We prove that the essential skeleton of $X$ coincides with the skeleton of any minimal $dlt$-model and that it is a strong deformation retract of the Berkovich analytification of $X$. As an application, we show that the essential skeleton of a Calabi-Yau variety over $k((t))$ is a pseudo-manifold.

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  1. The Frobenius structure theorem for affine log Calabi-Yau varieties containing a torus

    math.AG 2019-08 accept novelty 8.0 of 10

    Naive counts of rational curves in an affine log Calabi-Yau variety containing a torus uniquely determine a Frobenius algebra, now proved via non-archimedean analytic disk counting.

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