Commun. Korean Math. Soc. 2023; 38(1): 195-203
Online first article December 6, 2022 Printed January 31, 2023
https://doi.org/10.4134/CKMS.c210255
Copyright © The Korean Mathematical Society.
Assia Mostefaoui, Noura Sidhoumi
\'{E}cole Nationale Polytechnique d'Oran-Maurice Audin; \'{E}cole Nationale Polytechnique d'Oran-Maurice Audin
Special examples of harmonic manifolds that are not symmetric, proving that the conjecture posed by Lichnerowicz fails in the non-compact case have been intensively studied. We completely classify homogeneous structures on Damek-Ricci spaces equipped with the left invariant metric.
Keywords: Damek-Ricci spaces, homogeneous structures, Lorentzian metrics, left-invariant metrics
MSC numbers: Primary 53C50, 53B30
2014; 29(2): 319-329
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