Article

Cosmology from large-scale structure

Tilman TrösterInstitute for Astronomy, University of Edinburgh, Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ, UKAriel G. SánchezMax-Planck-Institut für Extraterrestrische Physik, Postfach 1312, Giessenbachstr., 85741 Garching, GermanyMarika AsgariInstitute for Astronomy, University of Edinburgh, Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ, UKChris BlakeCentre for Astrophysics & Supercomputing, Swinburne University of Technology, PO Box 218, Hawthorn, VIC 3122, AustraliaM. CrocceCatherine HeymansGerman Centre for Cosmological Lensing, Astronomisches Institut, Ruhr-Universität Bochum, Universitätsstr. 150, 44801 Bochum, GermanyH. HildebrandtGerman Centre for Cosmological Lensing, Astronomisches Institut, Ruhr-Universität Bochum, Universitätsstr. 150, 44801 Bochum, GermanyB. JoachimiDepartment of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, UKShahab JoudakiDepartment of Physics, University of Oxford, Denys Wilkinson Building, Keble Road, Oxford OX1 3RH, UKArun KannawadiLeiden Observatory, Leiden University, PO Box 9513, 2300 RA Leiden, The NetherlandsChieh-An LinInstitute for Astronomy, University of Edinburgh, Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ, UKAngus H. WrightGerman Centre for Cosmological Lensing, Astronomisches Institut, Ruhr-Universität Bochum, Universitätsstr. 150, 44801 Bochum, Germany

2019en

ABI

Abstract

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 Ω m = 0.317 +0.015 −0.019 , σ 8 = 0.710±0.049, and h = 0.704 ± 0.024 for flat ΛCDM cosmologies using uninformative priors on Ω c h 2 , 100 θ MC , ln10 10 A s , and n s , and a prior on Ω b h 2 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 σ 8 = 0.702 ± 0.029 and S 8 = σ 8 Ω m /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 ± 0.3 σ tension between the combined low-redshift probes and measurements from the cosmic microwave background.

Identifiers

DOI: 10.1051/0004-6361/201936772

Citations and references

Cited by 20 references

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