Non-isomorphic endomorphisms of Fano threefolds
Let $X$ be a smooth Fano threefold. We show that $X$ admits a non-isomorphic surjective endomorphism if and only if $X$ is either a toric variety or a product of $\mathbb{P}^1$ and a del Pezzo surface; in this case, $X$ is a rational variety. We further show that $X$ admits a polarized (or amplified) endomorphism if and only if $X$ is a toric variety.
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Algebraic Geometry
Dynamical Systems
14M25, 14E30, 32H50, 20K30, 08A35