Abstract
We have shown earlier that, contrary to popular belief, Einstein--de Sitter
(E--deS) models can still fit the 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
SDSS measurement of the large-scale correlation function of luminous red
galaxies at $z 0.35$ 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 $Łambda$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 $10-100 h^-1$ Mpc
cannot be reproduced properly without violating the CMB angular power spectrum
in the multipole range $l 100-1000$. Thus, the combination of the CMB
fluctuations and the shape of the correlation function up to $100
h^-1$Mpc, if confirmed, does seem to require dark energy for a homogeneous
cosmological model based on (adiabatic) inflationary perturbations.
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