On characteristic equations, trace identities and Casimir operators of simple Lie algebras

Details On characteristic equations, trace identities and Casimir operators of simple Lie algebras On characteristic equations, trace identities and Casimir operators of simple Lie algebras

1999-07-30

arxiv.org/abs/math-ph/9907024v1

J. Math. Phys. 41 no. 5 (2000) 3192-3225

Physics

Mathematical Physics

39 pages, 8 tables, latex

Scientific paper

10.1063/1.533300

Two approaches are developed to exploit, for simple complex or compact real Lie algebras g, the information that stems from the characteristic equations of representation matrices and Casimir operators. These approaches are selected so as to be viable not only for `small' Lie algebras and suitable for treatment by computer algebra. A very large body of new results emerges in the forms, a) of identities of a tensorial nature, involving structure constants etc. of g, b) of trace identities for powers of matrices of the adjoint and defining representations of g, c) of expressions of non-primitive Casimir operators of g in terms of primitive ones. The methods are sufficiently tractable to allow not only explicit proof by hand of the non-primitive nature of the quartic Casimir of g2, f4, e6, but also e.g. of that of the tenth order Casimir of f4.

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