Polarized endomorphisms of log Calabi-Yau pairs

Abstract

Let $(X,\Delta )$ be a dlt log Calabi-Yau pair admitting a polarized endomorphism. We show that $(X,\Delta )$ is a finite quotient of a toric log Calabi-Yau fibration over an abelian variety. We provide an example which shows that the previous statement does not hold if we drop the dlt condition of $(X,\Delta )$ even if $X$ is a smooth variety. Given a klt type variety $X$ and a log Calabi-Yau pair $(X,\Delta )$ admitting a polarized endomorphism, we show that a suitable birational modification of $(X,\Delta )$ is a finite quotient of a toric log Calabi-Yau fibration over an abelian variety.

26 pages. v2: added result regarding lifting surjective endomorphisms to small $\mathbb{Q}$-factorializations