Diagrammatic Derivation of Lovelock Densities

Details Diagrammatic Derivation of Lovelock Densities Diagrammatic Derivation of Lovelock Densities

2009-02-16

arxiv.org/abs/0902.2703v2

Phys. Rev. D 79, 107501, 2009

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

5 pages, 4 figures. References added. Corrected minor typos

Scientific paper

We discuss a method of calculating the various scalar densities encountered in Lovelock theory which relies on diagrammatic, instead of algebraic manipulations. Taking advantage of the known symmetric and antisymmetric properties of the Riemann tensor which appears in the Lovelock densities, we map every quadratic or higher contraction into a corresponding permutation diagram. The derivation of the explicit form of each density is then reduced to identifying the distinct diagrams, from which we can also read off the overall combinatoric factors. The method is applied to the first Lovelock densities, of order two (Gauss-Bonnet term) and three.

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