Details

Autor(en) / Beteiligte

• Bogdanos, C.

Titel

Diagrammatic derivation of Lovelock densities

Ist Teil von

• Physical review. D, Particles, fields, gravitation, and cosmology, 2009-05, Vol.79 (10), Article 107501

Ort / Verlag

American Physical Society

Erscheinungsjahr

2009

Link zum Volltext

Quelle

PROLA - Physical Review Online Archive

Beschreibungen/Notizen

• 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.