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Homogeneous bundles and the first eigenvalue of symmetric spaces

Leonardo Biliotti, Alessandro Ghigi (2008)

Annales de l’institut Fourier

In this note we prove the stability of the Gieseker point of an irreducible homogeneous bundle over a rational homogeneous space. As an application we get a sharp upper estimate for the first eigenvalue of the Laplacian of an arbitrary Kähler metric on a compact Hermitian symmetric spaces of ABCD–type.

Hyperplane section 𝕆 0 2 of the complex Cayley plane as the homogeneous space F 4 / P 4

Karel Pazourek, Vít Tuček, Peter Franek (2011)

Commentationes Mathematicae Universitatis Carolinae

We prove that the exceptional complex Lie group F 4 has a transitive action on the hyperplane section of the complex Cayley plane 𝕆 2 . Although the result itself is not new, our proof is elementary and constructive. We use an explicit realization of the vector and spin actions of Spin ( 9 , ) F 4 . Moreover, we identify the stabilizer of the F 4 -action as a parabolic subgroup P 4 (with Levi factor B 3 T 1 ) of the complex Lie group F 4 . In the real case we obtain an analogous realization of F 4 ( - 20 ) / .

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