Geodesic
Left-invariant Lorentzian Flat Metrics on Lie Groups
Journal of Lie theory, Tome 22 (2012) no. 1, pp. 269-289
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We call the Lie algebra of a Lie group with a left invariant pseudo-Riemannian flat metric pseudo-Riemannian flat Lie algebra. We give a new proof of a classical result of Milnor on Riemannian flat Lie algebras. We reduce the study of Lorentzian flat Lie algebras to those with trivial center or those with degenerate center. We show that the double extension process can be used to construct all Lorentzian flat Lie algebras with degenerate center generalizing a result of Aubert-Medina on Lorentzian flat nilpotent Lie algebras. Finally, we give the list of Lorentzian flat Lie algebras with degenerate center up to dimension 6.
Classification : 53C50, 16T25, 53C20, 17B62
Mots-clés : Coadjoint orbit, integral coadjoint orbit 
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     author = {M. A. Ben Haddou and M. Boucetta and H. Lebzioui},
     title = {Left-invariant {Lorentzian} {Flat} {Metrics} on {Lie} {Groups}},
     journal = {Journal of Lie theory},
     pages = {269--289},
     year = {2012},
     volume = {22},
     number = {1},
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M. A. Ben Haddou; M. Boucetta; H. Lebzioui. Left-invariant Lorentzian Flat Metrics on Lie Groups. Journal of Lie theory, Tome 22 (2012) no. 1, pp. 269-289. http://geodesic.mathdoc.fr/item/JLT_2012_22_1_JLT_2012_22_1_a10/