Large-scale galaxy correlations as a test for dark energy
We 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 rece...
| Hlavní autoři: | , , , |
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| Médium: | Journal article |
| Jazyk: | English |
| Vydáno: |
2005
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| _version_ | 1826303234469265408 |
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| author | Blanchard, A Douspis, M Rowan-Robinson, M Sarkar, S |
| author_facet | Blanchard, A Douspis, M Rowan-Robinson, M Sarkar, S |
| author_sort | Blanchard, A |
| collection | OXFORD |
| description | We 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. |
| first_indexed | 2024-03-07T05:59:33Z |
| format | Journal article |
| id | oxford-uuid:ebb3a0b2-0b51-4cbe-b0c1-75bdbd03e7fa |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T05:59:33Z |
| publishDate | 2005 |
| record_format | dspace |
| spelling | oxford-uuid:ebb3a0b2-0b51-4cbe-b0c1-75bdbd03e7fa2022-03-27T11:11:46ZLarge-scale galaxy correlations as a test for dark energyJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:ebb3a0b2-0b51-4cbe-b0c1-75bdbd03e7faEnglishSymplectic Elements at Oxford2005Blanchard, ADouspis, MRowan-Robinson, MSarkar, SWe 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. |
| spellingShingle | Blanchard, A Douspis, M Rowan-Robinson, M Sarkar, S Large-scale galaxy correlations as a test for dark energy |
| title | Large-scale galaxy correlations as a test for dark energy |
| title_full | Large-scale galaxy correlations as a test for dark energy |
| title_fullStr | Large-scale galaxy correlations as a test for dark energy |
| title_full_unstemmed | Large-scale galaxy correlations as a test for dark energy |
| title_short | Large-scale galaxy correlations as a test for dark energy |
| title_sort | large scale galaxy correlations as a test for dark energy |
| work_keys_str_mv | AT blancharda largescalegalaxycorrelationsasatestfordarkenergy AT douspism largescalegalaxycorrelationsasatestfordarkenergy AT rowanrobinsonm largescalegalaxycorrelationsasatestfordarkenergy AT sarkars largescalegalaxycorrelationsasatestfordarkenergy |