A journey from the octonionic $\mathbb P^2$ to a fake $\mathbb P^2$

Lev Borisov, Anders Buch, Enrico Fatighenti

Published 2020-08-22Version 1

We discover a family of surfaces of general type with $K^2=3$ and $p=q=0$ as free $C_{13}$ quotients of special linear cuts of the octonionic projective plane $\mathbb O \mathbb P^2$. A special member of the family has $3$ singularities of type $A_2$, and is a quotient of a fake projective plane. We use the techniques of \cite{BF20} to define this fake projective plane by explicit equations in its bicanonical embedding.