On m-ovoids of dual twisted triality hexagons

Abstract

A generalised hexagon of order $(s,t)$ is said to be \emph{extremal} if $t$ meets the Haemers-Roos bound, that is, $t=s^3$. The \emph{dual twisted triality hexagons} associated to the exceptional Lie type groups ${}^3{D}_4(s)$ have these parameters, and are the only known such examples. It was shown in the work of De Bruyn and Vanhove that an extremal generalised hexagon has no 1-ovoids. In this note, we prove that a dual twisted triality hexagon has no $m$-ovoids for every possible (nontrivial) value of $m$, except for the isolated case where $s=3$ and $m=2$.

arXiv commentThis paper has been withdrawn by the author due to a crucial error