The Cotton tensor in Riemannian spacetimes

Details The Cotton tensor in Riemannian spacetimes The Cotton tensor in Riemannian spacetimes

2003-09-01

arxiv.org/abs/gr-qc/0309008v2

Class.Quant.Grav. 21 (2004) 1099-1118

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

27 pages, revtex4

Scientific paper

10.1088/0264-9381/21/4/024

Recently, the study of three-dimensional spaces is becoming of great interest. In these dimensions the Cotton tensor is prominent as the substitute for the Weyl tensor. It is conformally invariant and its vanishing is equivalent to conformal flatness. However, the Cotton tensor arises in the context of the Bianchi identities and is present in any dimension. We present a systematic derivation of the Cotton tensor. We perform its irreducible decomposition and determine its number of independent components for the first time. Subsequently, we exhibit its characteristic properties and perform a classification of the Cotton tensor in three dimensions. We investigate some solutions of Einstein's field equations in three dimensions and of the topologically massive gravity model of Deser, Jackiw, and Templeton. For each class examples are given. Finally we investigate the relation between the Cotton tensor and the energy-momentum in Einstein's theory and derive a conformally flat perfect fluid solution of Einstein's field equations in three dimensions.

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