Subnormalisers of semisimple elements in finite groups of Lie type

Abstract

We determine subnormalisers of semisimple elements of prime power order in finite quasi-simple groups of Lie type. For this, we determine the maximal overgroups of normalisers of Sylow tori. This is motivated by the recent character correspondence conjecture by Moret\'o and Rizo as well as by the question of existence of quasi-semiregular elements in finite permutation groups.