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 $\mathrm{\Lambda }\mathrm{CDM}$ cosmology with massive neutrinos, we find the following late-Universe parameters: the Hubble constant $H_0=67.95_{-0.52}^{+0.66}\mathrm{km}{\mathrm{s}}^{-1}{\mathrm{Mpc}}^{-1}$, the matter density fraction ${\mathrm{\Omega }}_m=0.3079_{-0.0085}^{+0.0065}$, the mass fluctuation amplitude ${\sigma }_8=0.8087_{-0.0072}^{+0.012}$, and an upper limit on the sum of neutrino masses $M_{\mathrm{tot}}<0.16\mathrm{eV}$ (95% C.L.). This can be contrasted with the Planck-only measurements: $H_0=67.14_{-0.72}^{+1.3}\mathrm{km}{\mathrm{s}}^{-1}{\mathrm{Mpc}}^{-1}$, ${\mathrm{\Omega }}_m=0.3188_{-0.016}^{+0.0091}$, ${\sigma }_8=0.8053_{-0.0091}^{+0.019}$, and $M_{\mathrm{tot}}<0.26\mathrm{eV}$ (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, $N_{\mathrm{eff}}=2.88\pm 0.17$. 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.

• Received 26 December 2019
• Accepted 9 March 2020

DOI:https://doi.org/10.1103/PhysRevD.101.083504

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

Published by the American Physical Society