Central Extensions of the Quasi-orthogonal Lie algebras

Details Central Extensions of the Quasi-orthogonal Lie algebras Central Extensions of the Quasi-orthogonal Lie algebras

1996-12-17

arxiv.org/abs/q-alg/9612021v2

J.Phys.A31:1373-1394,1998

Physics

High Energy Physics

High Energy Physics - Theory

Latex file. 32 pages. Minor changes. To appear in J. Phys. A

Scientific paper

10.1088/0305-4470/31/5/008

We determine the central extensions of a whole family of Lie algebras, obtained by the method of graded contractions from so(N+1), N arbitrary. All the inhomogeneous orthogonal and pseudo-orthogonal algebras are members of this family, as well as a large number of other non-semisimple algebras, all of which have at least a semidirect structure (in some cases two or more). The dimensions of their second cohomology groups H^2(G,R) and the explicit expression of their central extensions are given.

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