Large-scale galaxy correlations as a test for dark energy

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dc.creatorBlanchard, Alain
dc.creatorDouspis, Marian
dc.creatorRowan-Robinson, Michael
dc.creatorSarkar, Subir
dc.date2005-12-05
dc.date2006-01-15
dc.date.accessioned2026-07-07T10:27:43Z
dc.date.available2026-07-07T10:27:43Z
dc.descriptionWe 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 $Λ$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.
dc.description4 pages, 2 figures, revised version, accepted to A&A
dc.identifierhttps://arxiv.org/abs/astro-ph/0512085
dc.identifierhttp://arxiv.org/abs/astro-ph/0512085
dc.identifierAstron.Astrophys.449:925,2006
dc.identifierdoi:10.1051/0004-6361:20054640
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/177235
dc.subjectAstrophysics
dc.titleLarge-scale galaxy correlations as a test for dark energy
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