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28 March 2024
 
  » arxiv » astro-ph/0512085

 Article overview


Large-scale galaxy correlations as a test for dark energy
Alain Blanchard ; Marian Douspis ; Michael Rowan-Robinson ; Subir Sarkar ;
Date 5 Dec 2005
Journal Astron.Astrophys. 449 (2006) 925
AbstractWe have shown earlier that, contrary to popular belief, Einstein--de Sitter (E--deS) models can still fit the {sl WMAP} data on the cosmic microwave background provided one adopts a low Hubble constant and relaxes the usual assumption that the primordial density perturbation is scale-free. The recent {sl SDSS} measurement of the large-scale correlation function of luminous red galaxies at $z sim 0.35$ has however provided a new constraint by detecting a `baryon acoustic peak’. Our best-fit E--deS models do possess a baryonic feature at a similar physical scale as the best-fit $Lambda$CDM concordance model, but do not fit the new observations as well as the latter. In particular the shape of the correlation function in the range $sim 10-100 h^{-1}$ Mpc cannot be reproduced properly without violating the CMB angular power spectrum in the multipole range $l sim 100-1000$. Thus, the combination of the CMB fluctuations and the shape of the correlation function up to $sim 100 h^{-1}$Mpc, if confirmed, does seem to require dark energy for a homogeneous cosmological model based on (adiabatic) inflationary perturbations.
Source arXiv, astro-ph/0512085
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