Figure 1.

(Color online) Luminosity distance – redshift relations for selected brane-world cosmologies and for the ΛCDM model, compared to the supernova data. The diagrams are log-scaled (left panel) and linearly scaled (right panel). Selected low absorption supernovae from Ref. [41] are plotted with red, black dots represent the Gold set [23]. Both sets are represented with the corresponding error bars on the log-scaled diagrams. For the sake of perspicuity, the error bars of low absorption supernovae are not represented on the linearly scaled diagrams. The plotted models are the ΛCDM model (2); the brane models with cosmological constant and late-time dark radiation (1 and 3); without cosmological constant but with dark radiation (5); with cosmological constant satisfying Λ = κ²λ/2, thus low brane tension (4 and 6) and no dark radiation.