Abstract
We construct a family of involutions on the space of matrices with real eigenvalues interpolating the complex conjugation and the transpose. We deduce from it a stratified homeomorphism between the space of real matrices with real eigenvalues and the space of symmetric matrices with real eigenvalues, which restricts to a real analytic isomorphism between individual -adjoint orbits and -adjoint orbits. We also establish similar results in more general settings of Lie algebras of classical types and quiver varieties. To this end, we prove a general result about involutions on hyper-Kähler quotients of linear spaces. We provide applications to the (generalized) Kostant–Sekiguchi correspondence, singularities of real and symmetric adjoint orbit closures, and Springer theory for real groups and symmetric spaces.
Citation
Tsao-Hsien Chen. David Nadler. "Real and symmetric matrices." Duke Math. J. 172 (9) 1623 - 1672, 15 June 2023. https://doi.org/10.1215/00127094-2022-0076
Information