On the Casimir of the group ISL(n,R) and its algebraic decomposition

Details On the Casimir of the group ISL(n,R) and its algebraic decomposition On the Casimir of the group ISL(n,R) and its algebraic decomposition

1996-09-27

arxiv.org/abs/hep-th/9609213v2

J.Math.Phys. 46 (2005) 063503

Physics

High Energy Physics

High Energy Physics - Theory

Scientific paper

In this paper, an explicit expression for the Casimir operator (or the Casimir invariant) of the inhomogeneous group ISL(n,R) in its enveloping algebra is proposed, which using contractions of the tenso- rial indices of the generating operators P^{rho} and E^{nu}{mu} may be presented in the following (slightly more comprehensible as equation (1)) form. The Casimir is obtained by symmetrizing this expression. This tensor form is useful in the classification of particles in affine gravitational gauge theories; such as that based on ISL(4,R). It is also proven that the Casimir of ISL(n,R) can be decomposed in terms of the Casimirs of its little groups, a key point in the posterior construction of its irreducible representations.

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