Comptes Rendus
Geometry
Compact simple Lie groups admitting left-invariant Einstein metrics that are not geodesic orbit
[Groupes de Lie simples compacts admettant des métriques d'Einstein invariantes à gauche, dont une géodésique n'est pas une orbite]
Comptes Rendus. Mathématique, Volume 356 (2018) no. 1, pp. 81-84.

Dans cet article, nous démontrons que les groupes simples compacts SU(n) pour n6, SO(n) pour n7, Sp(n) pour n3, E6, E7, E8 et F4 admettent des métriques d'Einstein invariantes à gauche, dont une géodésique maximale n'est pas une orbite d'un sous-groupe à un paramètre du groupe des isométries complet. Ceci fournit une réponse positive à un problème récemment posé par Nikonorov.

In this article, we prove that the compact simple Lie groups SU(n) for n6, SO(n) for n7, Sp(n) for n3, E6,E7,E8, and F4 admit left-invariant Einstein metrics that are not geodesic orbit. This gives a positive answer to an open problem recently posed by Nikonorov.

Reçu le :
Accepté le :
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DOI : 10.1016/j.crma.2017.11.018
Huibin Chen 1 ; Zhiqi Chen 1 ; Shaoqiang Deng 1

1 School of Mathematical Sciences and LPMC, Nankai University, Tianjin 300071, PR China
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Huibin Chen; Zhiqi Chen; Shaoqiang Deng. Compact simple Lie groups admitting left-invariant Einstein metrics that are not geodesic orbit. Comptes Rendus. Mathématique, Volume 356 (2018) no. 1, pp. 81-84. doi : 10.1016/j.crma.2017.11.018. https://comptes-rendus.academie-sciences.fr/mathematique/articles/10.1016/j.crma.2017.11.018/

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[3] H. Chen; Z. Chen; S. Deng New non-naturally reductive Einstein metrics on exceptional simple Lie groups, 2016 (Preprint) | arXiv

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[8] K. Mori Left Invariant Einstein Metrics on SU(n) That Are Not Naturally Reductive, Osaka University, 1994 Master Thesis (in Japanese) English Translation: Osaka University RPM 96010 (preprint series), 1996

[9] Y.G. Nikonorov Classification of generalized Wallach spaces, Geom. Dedic., Volume 181 (2016) no. 1, pp. 193-212

[10] Y.G. Nikonorov On left-invariant Einstein Riemannian metrics that are not geodesic orbit, Transform. Groups (2017) (in press) | arXiv

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Supported by NSFC (No. 11671212, 51535008) of China.

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