BOSS DR12 full-shape cosmology: Λ CDM constraints from the large-scale galaxy power spectrum and bispectrum monopole

Journal Article · Fri Feb 11 00:00:00 EST 2022 · Physical Review. D.

DOI:https://doi.org/10.1103/physrevd.105.043517· OSTI ID:1982795

Philcox, Oliver H. E.  ^[1]; Ivanov, Mikhail M. ^[2]

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1. Princeton Univ., NJ (United States); Institute for Advanced Study, Princeton, NJ (United States)
2. Institute for Advanced Study, Princeton, NJ (United States)

Here, we present a full Λ CDM analysis of the BOSS DR12 dataset, including information from the power spectrum multipoles, the real-space power spectrum, the reconstructed power spectrum and the bispectrum monopole. This is the first analysis to feature a complete treatment of the galaxy bispectrum, including a consistent theoretical model and without large-scale cuts. Unlike previous works, the statistics are measured using window-free estimators: this greatly reduces computational costs by removing the need to window-convolve the theory model. Our pipeline is tested using a suite of high-resolution mocks and shown to be robust and precise, with systematic errors far below the statistical thresholds. Inclusion of the bispectrum yields consistent parameter constraints and shrinks the σ 8 posterior by 13% to reach < 5 % precision; less conservative analysis choices would reduce the error bars further. Our constraints are broadly consistent with Planck: in particular, we find H₀ = 69.6$$^{+1.1}_{–1.3}$$ km s^–1 Mpc^–1, σ₈ = 0.692$$^{+0.035}_{–0.041}$$ and n_s = 0.870$$^{+0.067}_{–0.064}$$, including a BBN prior on the baryon density. When n_s is set by Planck, we find H₀= 68.31$$^{+0.83}_{–0.86}$$ km s^–1 Mpc^–1 and σ₈ = 0.722$$^{+0.032}_{–0.036}$$. Our S₈ posterior, 0.751 ± 0.039, is consistent with weak lensing studies, but lower than Planck. Constraints on the higher-order bias parameters are significantly strengthened from the inclusion of the bispectrum, and we find no evidence for deviation from the dark matter halo bias relations. These results represent the most complete full-shape analysis of BOSS DR12 to-date, and the corresponding spectra will enable a variety of beyond-Λ CDM analyses, probing phenomena such as the neutrino mass and primordial non-Gaussianity.

• Research Organization: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)
• Sponsoring Organization: USDOE Office of Science (SC)
• Grant/Contract Number: AC02-05CH11231
• OSTI ID: 1982795
• Alternate ID(s): OSTI ID: 1847448
• Journal Information: Physical Review. D., Vol. 105, Issue 4; ISSN 2470-0010
• Publisher: American Physical Society (APS)
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
cosmological parameters
dark energy
evolution of the universe
inflation
large scale structure of the universe