Spherical nilpotent orbits and the Kostant-Sekiguchi correspondence
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- by Donald R. King PDF
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Abstract:
Let $G$ be a connected, linear semisimple Lie group with Lie algebra $\mathfrak g$, and let ${K_{{}_{\mathbf C}}}~\rightarrow ~{\operatorname {Aut} (\mathfrak p_{{}_{\mathbf C}})}$ be the complexified isotropy representation at the identity coset of the corresponding symmetric space. The Kostant-Sekiguchi correspondence is a bijection between the nilpotent $K_{{}_{\mathbf C}}$-orbits in $\mathfrak p_{{}_{\mathbf C}}$ and the nilpotent $G$-orbits in $\mathfrak g$. We show that this correspondence associates each spherical nilpotent $K_{{}_{\mathbf C}}$-orbit to a nilpotent $G$-orbit that is multiplicity free as a Hamiltonian $K$-space. The converse also holds.References
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Additional Information
- Donald R. King
- Affiliation: Department of Mathematics, Northeastern University, Boston, Massachusetts 02115
- Email: donking@neu.edu
- Received by editor(s): February 7, 2001
- Received by editor(s) in revised form: April 16, 2002
- Published electronically: August 1, 2002
- © Copyright 2002 American Mathematical Society
- Journal: Trans. Amer. Math. Soc. 354 (2002), 4909-4920
- MSC (2000): Primary 22E46; Secondary 14R20, 53D20
- DOI: https://doi.org/10.1090/S0002-9947-02-03089-1
- MathSciNet review: 1926842