Unitals in $PG(2,q^2)$ with a large 2-point stabiliser

L. Giuzzi, G. Korchmáros

Published 2010-09-30, updated 2011-07-06Version 3

Let $\cU$ be a unital embedded in the Desarguesian projective plane $\PG(2,q^2)$. Write $M$ for the subgroup of $\PGL(3,q^2)$ which preserves $\cU$. We show that $\cU$ is classical if and only if $\cU$ has two distinct points $P,Q$ for which the stabiliser $G=M_{P,Q}$ has order $q^2-1$.