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A class of solvable Lie algebras and their Casimir invariants

L Šnobl1,2 and P Winternitz3

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A nilpotent Lie algebra {\mathfrak n}_{n,1} with an (n − 1)-dimensional Abelian ideal is studied. All indecomposable solvable Lie algebras with {\mathfrak n}_{n,1} as their nilradical are obtained. Their dimension is at most n + 2. The generalized Casimir invariants of {\mathfrak n}_{n,1} and of its solvable extensions are calculated. For n = 4 these algebras figure in the Petrov classification of Einstein spaces. For larger values of n they can be used in a more general classification of Riemannian manifolds.


PACS

02.20.Sv Lie algebras of Lie groups

02.10.Ud Linear algebra

MSC

20Kxx Abelian groups

46J30 Subalgebras

22Exx Lie groups (For the topology of Lie groups and homogeneous spaces, see 57Sxx, 57Txx; for analysis thereon, see 43A80, 43A85, 43A90)

Subjects

Mathematical physics

Dates

Issue 12 (25 March 2005)

Received 4 November 2004, in final form 4 February 2005

Published 9 March 2005



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