= Dark radiation on a cosmological brane
{title2=$\rho_{\mathcal E}\propto\mathcal C a^{-4}$}
Projected bulk <Weyl tensor> can contribute a radiation-scaling term to the brane <Friedmann equation>, even without ordinary brane photons. For an anti-de Sitter black-hole bulk the integration constant is related to its mass. This <dark radiation on a cosmological brane> changes the expansion rate tested by <Big Bang nucleosynthesis> and <Cosmic microwave background anisotropy>; it should not automatically be identified with a freely specifiable thermal particle species.
Back to article page
