Complexity of nilpotent orbits and the Kostant-Sekiguchi correspondence

Details Complexity of nilpotent orbits and the Kostant-Sekiguchi correspondence Complexity of nilpotent orbits and the Kostant-Sekiguchi correspondence

2003-03-07

arxiv.org/abs/math/0303096v1

Mathematics

Representation Theory

7 pages

Scientific paper

Let G be a connected linear semisimple Lie group with Lie algebra g, and let K_C --> Aut(p_C) be the complexified isotropy representation at the identity coset of the corresponding symmetric space G/K. Suppose that O is a nilpotent G-orbit in g and O* is the nilpotent K_C-orbit in p_C associated to O by the Kostant-Sekiguchi correspondence. We show that the complexity of O* as a K_C variety measures the failure of the Poisson algebra of smooth K-invariant functions on O to be commutative.

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