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arXiv · 2304.08155

Kähler-Einstein metrics on families of Fano varieties

Chung-Ming Pan·Antonio Trusiani
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Abstract

Given a one-parameter family of $\mathbb{Q}$-Fano varieties such that the central fibre admits a unique Kähler-Einstein metric, we provide an analytic method to show that the neighboring fibre admits a unique Kähler-Einstein metric. Our results go beyond by establishing uniform a priori estimates on the Kähler-Einstein potentials along fully degenerate families of $\mathbb{Q}$-Fano varieties. In addition, we show the continuous variation of these Kähler-Einstein currents, and establish uniform Moser-Trudinger inequalities and uniform coercivity of the Ding functionals. Central to our article is introducing and studying a notion of convergence for quasi-plurisubharmonic functions within families of normal Kähler varieties. We show that the Monge-Ampère energy is upper semi-continuous with respect to this topology, and we establish a Demailly-Kollár result for functions with full Monge-Ampère mass.

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Chung-Ming Pan, Antonio Trusiani. 2024-10-30. Kähler-Einstein metrics on families of Fano varieties. https://doi.org/10.1515/crelle-2024-0081

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