Large-scale galaxy correlations as a test for dark energy

被引:22
作者
Blanchard, A
Douspis, M
Rowan-Robinson, M
Sarkar, S
机构
[1] LATT, F-31400 Toulouse, France
[2] Univ London Imperial Coll Sci Technol & Med, Blackett Lab, Astrophys Grp, London SW7 2BW, England
[3] Univ Oxford, Rudolf Peierls Ctr Theoret Phys, Oxford OX1 3NP, England
关键词
cosmic microwave background; large-scale structure of Universe; cosmological parameters;
D O I
10.1051/0004-6361:20054640
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
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 similar to 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.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 similar to 10- 100 h(-1) Mpc cannot be reproduced properly without violating the CMB angular power spectrum in the multipole range l similar to 100-1000. Thus, the combination of the CMB fluctuations and the shape of the correlation function up to similar to 100 h(-1) Mpc, if confirmed, does seem to require dark energy for a homogeneous cosmological model based on ( adiabatic) inflationary perturbations.
引用
收藏
页码:925 / 928
页数:4
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