Jm. Moller et D. Notbohm, CONNECTED FINITE LOOP-SPACES WITH MAXIMAL TORI, Transactions of the American Mathematical Society, 350(9), 1998, pp. 3483-3504
Finite loop spaces are a generalization of compact Lie groups. However
, they do not enjoy all of the nice properties of compact Lie groups.
For example, having a maximal torus is a quite distinguished property.
Actually, an old conjecture, due to Wilkerson, says that every connec
ted finite loop space with a maximal torus is equivalent to a compact
connected Lie group. We give some more evidence for this conjecture by
showing that the associated action of the Weyl group on the maximal t
orus always represents the Weyl group as a crystallographic group. We
also develop the notion of normalizers of maximal tori for connected f
inite loop spaces, and prove for a large class of connected finite loo
p spaces that a connected finite loop space with maximal torus is equi
valent to a compact connected Lie group if it has the right normalizer
of the maximal torus. Actually, in the cases under consideration the
information about the Weyl group is sufficient to give the answer. All
this is done by first studying the analogous local problems.