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arXiv · 2609.28986

Ricci entropy, RCD structures and Kahler spaces

Bin Guo·Jian Song·Jacob Sturm
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Abstract

This paper is the final installment in our series on the geometric theory of complex Monge-Ampere equations. We study singular Kahler metrics on compact normal Kahler spaces with klt singularities whose volume densities lie in $L^p$ for some $p>1$. We show that a lower bound for the Ricci current in the sense of pluripotential theory is equivalent to a synthetic Ricci lower bound in the sense of RCD theory. As a consequence, every Kahler class on a compact normal Kahler space with klt singularities admits an RCD structure, which makes differential geometric analysis available on singular complex spaces. As an application, we show that the fundamental group of a compact Kahler Calabi-Yau space with klt singularities is almost Abelian. We further establish compactness results for singular Kahler-Einstein spaces.

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Bin Guo, Jian Song, Jacob Sturm. 2026-09-24. Ricci entropy, RCD structures and Kahler spaces. https://arxiv.org/abs/2609.28986

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