Comptes Rendus
Differential geometry/Lie algebras
On left-invariant Einstein metrics that are not geodesic orbit
[Sur les métriques d'Einstein invariantes à gauche, qui ne sont pas à orbites géodésiques]
Comptes Rendus. Mathématique, Volume 357 (2019) no. 7, pp. 624-628.

Dans cette Note, nous démontrons que les groupes de Lie simples, compacts, SO(n) (n>12) admettent au moins deux métriques d'Einstein invariantes à gauche, dont des géodésiques maximales ne sont pas des orbites de sous-groupes à un paramètre du groupe d'isométries complet. Ceci répond par l'affirmative à une question récemment posée par Nikonorov.

In this article, we prove that compact simple Lie groups SO(n) (n>12) admit at least two left-invariant Einstein metrics that are not geodesic orbit, which gives a positive answer to a problem recently posed by Nikonorov.

Reçu le :
Accepté le :
Publié le :
DOI : 10.1016/j.crma.2019.07.003
Na Xu 1 ; Ju Tan 1

1 School of Mathematics and Physics, Anhui University of Technology, Maanshan, 243032, People's Republic of China
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     title = {On left-invariant {Einstein} metrics that are not geodesic orbit},
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Na Xu; Ju Tan. On left-invariant Einstein metrics that are not geodesic orbit. Comptes Rendus. Mathématique, Volume 357 (2019) no. 7, pp. 624-628. doi : 10.1016/j.crma.2019.07.003. https://comptes-rendus.academie-sciences.fr/mathematique/articles/10.1016/j.crma.2019.07.003/

[1] A. Arvanitoyeorgos; K. Mori; Y. Sakane Einstein metrics on compact Lie groups which are not naturally reductive, Geom. Dedic., Volume 160 (2012) no. 1, pp. 261-285

[2] H. Chen; Z. Chen; S. Deng Compact simple Lie groups admitting left invariant Einstein metrics that are not geodesic orbit, C. R. Acad. Sci. Paris, Ser. I, Volume 356 (2018), pp. 81-84

[3] Z. Chen; K. Liang Non-naturally reductive Einstein metrics on the compact simple Lie group F4, Ann. Glob. Anal. Geom., Volume 46 (2014), pp. 103-115

[4] I. Chrysikos; Y. Sakane Non-naturally reductive Einstein metrics on exceptional Lie groups, J. Geom. Phys., Volume 116 (2017), pp. 152-186

[5] O. Kowalski; L. Vanhecke Riemannian manifolds with homogeneous geodesic, Boll. Unione Mat. Ital., B (7), Volume 5 (1991) no. 1, pp. 189-246

[6] Y.G. Nikonorov On left invariant Einstein Riemannian metrics that are not geodesic orbit, Transform. Groups, Volume 24 (2019) no. 2, pp. 511-530

[7] J. Ta; N. Xu Homogeneous Einstein–Randers metrics on symplectic groups, J. Math. Anal. Appl., Volume 472 (2019), pp. 1902-1913

[8] Z. Ya; S. Deng Einstein metrics on compact simple Lie groups attached to standard triples, Trans. Amer. Math. Soc., Volume 369 (2017), pp. 8587-8605

[9] B. Zhang; H. Chen; J. Tan New non-naturally reductive Einstein metrics on SO(n), Int. J. Math., Volume 29 (2018)

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