Noncommutative ampleness from finite endomorphisms

Abstract

Let $X$ be a projective integral scheme with endomorphism $\sigma$, where $\sigma$ is finite, but not an automorphism. We examine noncommutative ampleness of bimodules defined by $\sigma$. In contrast to the automorphism case, one-sided ampleness is possible. We also find that rings and bimodule algebras associated with $\sigma$ are not noetherian.