G-birationally rigid cubic threefolds

Ivan Cheltsov, Igor Krylov, Sione Ma'u

We classify pairs $(X,G)$ consisting of a (possibly singular) cubic threefold $X\subset {\mathbb{P}}^4$ and a finite subgroup $G\subset \mathrm{Aut}(X)$ such that $X$ is $G$-birational…