Astronomy & Astrophysics

Issue		A&A Volume 452, Number 3, June IV 2006
Page(s)		781 - 794
Section		Cosmology (including clusters of galaxies)
DOI		10.1051/0004-6361:20054154

A&A 452, 781-794 (2006)
DOI: 10.1051/0004-6361:20054154

Branes: cosmological surprise and observational deception

S. Fay^{1, 2}

¹ 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: steph.fay@gmail.com

(Received 5 September 2005 / Accepted 5 January 2006)

Abstract
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 $\gamma_\phi$ depending on the redshift. We calculate this index for each model and show that they mimic a universe close to a $\Lambda CDM$ model today.

Key words: cosmological parameters -- dark matter

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