Additive actions on toric projective hypersurfaces

Abstract

Let $\mathbb{K}$ be an algebraically closed field of characteristic zero and ${\mathbb{G}}_a$ be the additive group of $\mathbb{K}$. We say that an irreducible algebraic variety $X$ of dimension $n$ over the field $\mathbb{K}$ admits an additive action if there is a regular action of the group ${\mathbb{G}}_a^n={\mathbb{G}}_a\times \dots \times {\mathbb{G}}_a$ ($n$ times) on $X$ with an open orbit. In this paper we find all projective toric hypersurfaces admitting additive action.

13 pages