Cosmology from large-scale structure: constraining ΛCDM with BOSS
We reanalyse the anisotropic galaxy clustering measurement from the Baryon Oscillation Spectroscopic Survey (BOSS), demonstrating that using the full shape information provides cosmological constraints that are comparable to other low-redshift probes. We find Ωm = 0.317+0.015−0.019, σ8 = 0.710±0.049...
| Main Authors: | , , , , , , , , , , , |
|---|---|
| Format: | Journal article |
| Language: | English |
| Published: |
EDP Sciences
2020
|
| _version_ | 1797090177192034304 |
|---|---|
| author | Troster, T Sanchez, AG Asgari, M Blake, C Crocce, M Heymans, C Hildebrandt, H Joachimi, B Joudaki, S Kannawadi, A Lin, C-A Wright, A |
| author_facet | Troster, T Sanchez, AG Asgari, M Blake, C Crocce, M Heymans, C Hildebrandt, H Joachimi, B Joudaki, S Kannawadi, A Lin, C-A Wright, A |
| author_sort | Troster, T |
| collection | OXFORD |
| description | We reanalyse the anisotropic galaxy clustering measurement from the Baryon Oscillation Spectroscopic Survey (BOSS), demonstrating that using the full shape information provides cosmological constraints that are comparable to other low-redshift probes. We find Ωm = 0.317+0.015−0.019, σ8 = 0.710±0.049, and h = 0.704 ± 0.024 for flat ΛCDM cosmologies using uninformative priors on Ωch2, 100θMC, ln1010As, and ns, and a prior on Ωbh2 that is much wider than current constraints. We quantify the agreement between the Planck 2018 constraints from the cosmic microwave background and BOSS, finding the two data sets to be consistent within a flat ΛCDM cosmology using the Bayes factor as well as the prior-insensitive suspiciousness statistic. Combining two low-redshift probes, we jointly analyse the clustering of BOSS galaxies with weak lensing measurements from the Kilo-Degree Survey (KV450). The combination of BOSS and KV450 improves the measurement by up to 45%, constraining σ8 = 0.702 ± 0.029 and S8 = σ8 Ωm/0.3 = 0.728 ± 0.026. Over the full 5D parameter space, the odds in favour of a single cosmology describing galaxy clustering, lensing, and the cosmic microwave background are 7 ± 2. The suspiciousness statistic signals a 2.1 ± 0.3σ tension between the combined low-redshift probes and measurements from the cosmic microwave background. |
| first_indexed | 2024-03-07T03:14:44Z |
| format | Journal article |
| id | oxford-uuid:b568a6fe-2e5d-4d4d-9467-6e1ce5d5cf60 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T03:14:44Z |
| publishDate | 2020 |
| publisher | EDP Sciences |
| record_format | dspace |
| spelling | oxford-uuid:b568a6fe-2e5d-4d4d-9467-6e1ce5d5cf602022-03-27T04:33:16ZCosmology from large-scale structure: constraining ΛCDM with BOSSJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:b568a6fe-2e5d-4d4d-9467-6e1ce5d5cf60EnglishSymplectic ElementsEDP Sciences2020Troster, TSanchez, AGAsgari, MBlake, CCrocce, MHeymans, CHildebrandt, HJoachimi, BJoudaki, SKannawadi, ALin, C-AWright, AWe reanalyse the anisotropic galaxy clustering measurement from the Baryon Oscillation Spectroscopic Survey (BOSS), demonstrating that using the full shape information provides cosmological constraints that are comparable to other low-redshift probes. We find Ωm = 0.317+0.015−0.019, σ8 = 0.710±0.049, and h = 0.704 ± 0.024 for flat ΛCDM cosmologies using uninformative priors on Ωch2, 100θMC, ln1010As, and ns, and a prior on Ωbh2 that is much wider than current constraints. We quantify the agreement between the Planck 2018 constraints from the cosmic microwave background and BOSS, finding the two data sets to be consistent within a flat ΛCDM cosmology using the Bayes factor as well as the prior-insensitive suspiciousness statistic. Combining two low-redshift probes, we jointly analyse the clustering of BOSS galaxies with weak lensing measurements from the Kilo-Degree Survey (KV450). The combination of BOSS and KV450 improves the measurement by up to 45%, constraining σ8 = 0.702 ± 0.029 and S8 = σ8 Ωm/0.3 = 0.728 ± 0.026. Over the full 5D parameter space, the odds in favour of a single cosmology describing galaxy clustering, lensing, and the cosmic microwave background are 7 ± 2. The suspiciousness statistic signals a 2.1 ± 0.3σ tension between the combined low-redshift probes and measurements from the cosmic microwave background. |
| spellingShingle | Troster, T Sanchez, AG Asgari, M Blake, C Crocce, M Heymans, C Hildebrandt, H Joachimi, B Joudaki, S Kannawadi, A Lin, C-A Wright, A Cosmology from large-scale structure: constraining ΛCDM with BOSS |
| title | Cosmology from large-scale structure: constraining ΛCDM with BOSS |
| title_full | Cosmology from large-scale structure: constraining ΛCDM with BOSS |
| title_fullStr | Cosmology from large-scale structure: constraining ΛCDM with BOSS |
| title_full_unstemmed | Cosmology from large-scale structure: constraining ΛCDM with BOSS |
| title_short | Cosmology from large-scale structure: constraining ΛCDM with BOSS |
| title_sort | cosmology from large scale structure constraining λcdm with boss |
| work_keys_str_mv | AT trostert cosmologyfromlargescalestructureconstraininglcdmwithboss AT sanchezag cosmologyfromlargescalestructureconstraininglcdmwithboss AT asgarim cosmologyfromlargescalestructureconstraininglcdmwithboss AT blakec cosmologyfromlargescalestructureconstraininglcdmwithboss AT croccem cosmologyfromlargescalestructureconstraininglcdmwithboss AT heymansc cosmologyfromlargescalestructureconstraininglcdmwithboss AT hildebrandth cosmologyfromlargescalestructureconstraininglcdmwithboss AT joachimib cosmologyfromlargescalestructureconstraininglcdmwithboss AT joudakis cosmologyfromlargescalestructureconstraininglcdmwithboss AT kannawadia cosmologyfromlargescalestructureconstraininglcdmwithboss AT linca cosmologyfromlargescalestructureconstraininglcdmwithboss AT wrighta cosmologyfromlargescalestructureconstraininglcdmwithboss |