Generalization of the Gell-Mann formula for sl(n,R) and su(n) algebras

Details Generalization of the Gell-Mann formula for sl(n,R) and su(n) algebras Generalization of the Gell-Mann formula for sl(n,R) and su(n) algebras

2010-06-07

arxiv.org/abs/1006.1224v1

Physics

Mathematical Physics

Scientific paper

The so called Gell-Mann or decontraction formula is proposed as an algebraic expression inverse to the Inonu-Wigner Lie algebra contraction. It is tailored to express the Lie algebra elements in terms of the corresponding contracted ones. In the case of sl(n,R) and su(n) algebras, contracted w.r.t. so(n) subalgebras, this formula is generally not valid, and applies only in the cases of some algebra representations. A generalization of the Gell-Mann formula for sl(n,R) and su(n) algebras, that is valid for all tensorial, spinorial, (non)unitary representations, is obtained in a group manifold framework of the SO(n) and/or Spin(n) group. The generalized formula is simple, concise and of ample application potentiality. The matrix elements of the SL(n,R)/Spin(n), i.e. SU(n)/SO(n), generators are determined, by making use of the generalized formula, in a closed form for all irreducible representations.

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