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  Cosmology from large-scale structure - Constraining ΛCDM with BOSS

Tröster, T., Sánchez, A. G., Asgari, M., Blake, C., Crocce, M., Heymans, C., et al. (2020). Cosmology from large-scale structure - Constraining ΛCDM with BOSS. Astronomy and Astrophysics, 633: L10. doi:10.1051/0004-6361/201936772.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0006-1092-2 Version Permalink: http://hdl.handle.net/21.11116/0000-0006-1093-1
Genre: Journal Article

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 Creators:
Tröster, Tilman, Author
Sánchez, Ariel G.1, Author              
Asgari, Marika, Author
Blake, Chris, Author
Crocce, Martín, Author
Heymans, Catherine, Author
Hildebrandt, Hendrik, Author
Joachimi, Benjamin, Author
Joudaki, Shahab, Author
Kannawadi, Arun, Author
Lin, Chieh-An, Author
Wright, Angus, Author
Affiliations:
1Optical and Interpretative Astronomy, MPI for Extraterrestrial Physics, Max Planck Society, ou_159895              

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 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 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.

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 Dates: 2020-01-15
 Publication Status: Published online
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 Identifiers: DOI: 10.1051/0004-6361/201936772
Other: LOCALID: 3220234
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Title: Astronomy and Astrophysics
  Other : Astron. Astrophys.
Source Genre: Journal
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Publ. Info: France : EDP Sciences S A
Pages: - Volume / Issue: 633 Sequence Number: L10 Start / End Page: - Identifier: ISSN: 1432-0746
CoNE: https://pure.mpg.de/cone/journals/resource/954922828219_1