Branes: cosmological surprise and observational deception
School of Mathematical Science, Queen Mary University of London, Mile End road, London E1 4NS, UK
2 Laboratoire Univers et Théories (LUTH), UMR 8102, Observatoire de Paris, 92195 Meudon Cedex, France e-mail: email@example.com
Accepted: 5 January 2006
Using some supernovae and CMB data, we constrain the Cardassian, Randall-Sundrum, and Dvali-Gabadadze-Porrati brane-inspired cosmological models. We show that a transient acceleration and an early loitering period are usually excluded by the data. Moreover, the three models are equivalent to some usual quintessence/ghost dark energy models defined by a barotropic index depending on the redshift. We calculate this index for each model and show that they mimic a universe close to a model today.
Key words: cosmological parameters / dark matter
© ESO, 2006