Lie Algebra Decomposition Classes for Reductive Algebraic Groups in Arbitrary Characteristic

In this paper, we investigate the decomposition classes of the Lie algebras of connected reductive algebraic groups, over algebraically closed fields of arbitrary characteristic.

We extend some results proved previously under restrictions on the characteristic, including a formula for the dimension of a decomposition class, and introduce Levi-type decomposition classes to account for some of the difficulties encountered in bad characteristic.

We also establish properties of Lusztig--Spaltenstein induction of non-nilpotent orbits, such as parabolic independence, extending the known results for nilpotent orbits.

Finally, we determine the covering relation for the closure order on decomposition classes, in the case of good characteristic.