English

Polarized endomorphisms of log Calabi-Yau pairs

Algebraic Geometry 2025-08-20 v2

Abstract

Let (X,Δ)(X,\Delta) be a dlt log Calabi-Yau pair admitting a polarized endomorphism. We show that (X,Δ)(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,Δ)(X,\Delta) even if XX is a smooth variety. Given a klt type variety XX and a log Calabi-Yau pair (X,Δ)(X,\Delta) admitting a polarized endomorphism, we show that a suitable birational modification of (X,Δ)(X,\Delta) is a finite quotient of a toric log Calabi-Yau fibration over an abelian variety.

Keywords

Cite

@article{arxiv.2406.18092,
  title  = {Polarized endomorphisms of log Calabi-Yau pairs},
  author = {Joaquín Moraga and José Ignacio Yáñez and Wern Yeong},
  journal= {arXiv preprint arXiv:2406.18092},
  year   = {2025}
}

Comments

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