Cosmological parameters and neutrino masses from the final Planck and full-shape BOSS data

2019/12/17 by Mikhail M. Ivanov, Marko Simonović, Matias Zaldarriaga +1 · 7 citations
Physics and Astronomy · #Astrophysics #Baryon #Cosmic microwave background #Cosmology #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Galaxies: Formation, Evolution, Phenomena #Galaxy #Hubble's law #Neutrino #Particle physics #Physics #Planck #Quantum mechanics #Redshift #astro-ph.CO #hep-ph

paper · pdf · doi:10.1103/physrevd.101.083504

published as Phys. Rev. D 101, 083504 (2020) · 13 pages, 3 figures

arxiv created 2019/12/17 · openalex created_date 2019/12/26 · openalex publication_date 2020/04/03 · arxiv updated 2020/04/08 · openalex updated_date 2026/08/06

Abstract

We present a joint analysis of the Planck cosmic microwave background (CMB) and Baryon Oscillation Spectroscopic Survey (BOSS) final data releases. A key novelty of our study is the use of a new full-shape (FS) likelihood for the redshift-space galaxy power spectrum of the BOSS data, based on an improved perturbation theory template. We show that the addition of the redshift-space galaxy clustering measurements breaks degeneracies present in the CMB data alone and tightens constraints on cosmological parameters. Assuming the minimal \mathrm\ensuremathΛCDM cosmology with massive neutrinos, we find the following late-Universe parameters: the Hubble constant H₀=67.95_\ensuremath-0.52^+0.66 km s^\ensuremath-1 Mpc^\ensuremath-1, the matter density fraction \mathrm\ensuremathΩ_m=0.3079_\ensuremath-0.0085^+0.0065, the mass fluctuation amplitude \ensuremathσ₈=0.8087_\ensuremath-0.0072^+0.012, and an upper limit on the sum of neutrino masses M_tot<0.16 eV (95% C.L.). This can be contrasted with the Planck-only measurements: H₀=67.14_\ensuremath-0.72^+1.3 km s^\ensuremath-1 Mpc^\ensuremath-1, \mathrm\ensuremathΩ_m=0.3188_\ensuremath-0.016^+0.0091, \ensuremathσ₈=0.8053_\ensuremath-0.0091^+0.019, and M_tot<0.26 eV (95% C.L.). Our bound on the sum of neutrino masses relaxes once the hierarchy-dependent priors from the oscillation experiments are imposed. The addition of the new FS likelihood also constrains the effective number of extra relativistic degrees of freedom, N_eff=2.88\ifmmode±\else\textpm\fi0.17. Our study shows that the current FS and the pure baryon acoustic oscillation data add a similar amount of information in combination with the Planck likelihood. We argue that this is just a coincidence given the BOSS volume and efficiency of the current reconstruction algorithms. In the era of future surveys FS will play a dominant role in cosmological parameter measurements.

Citations

• Efficient sampling of fast and slow cosmological parameters
• Massive neutrinos and cosmology
• The Effective Field Theory of Large-Scale Structure in the presence of Massive Neutrinos
• Messengers from the Early Universe: Cosmic Neutrinos and Other Light Relics

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