Modeling Background Radiation in Isotropic Cosmologies
arXiv:1101.2991 · doi:10.1007/s10714-011-1144-3
Abstract
Using explicit perturbations of isotropic cosmological models which describe simple gravitational waves, an isotropic tensor having the algebraic symmetries of the Bel-Robinson tensor is derived as a model of cosmic background gravitational radiation and this is used to provide an answer to the question: in what sense can an energy-momentum-stress tensor similar to that describing the cosmic microwave background radiation (neglecting anisotropies) be associated with an isotropic background of gravitational radiation?
15 pages, Latex file, accepted for publication in General Relativity and Gravitation