Cosmological parameters from the BOSS galaxy power spectrum

By Mikhail Ivanov, M. Simonovi'c, M. Zaldarriaga. Journal of Cosmology and Astroparticle Physics, 2019

405 citations recorded by the source corpus.

We present cosmological parameter measurements from the publicly available Baryon Oscillation Spectroscopic Survey (BOSS) data on anisotropic galaxy clustering in Fourier space. Compared to previous studies, our analysis has two main novel features. First, we use a complete perturbation theory model that properly takes into account the non-linear effects of dark matter clustering, short-scale physics, galaxy bias, redshift-space distortions, and large-scale bulk flows. Second, we employ a Markov-Chain Monte-Carlo technique and consistently reevaluate the full power spectrum likelihood as we scan over different cosmologies. Our baseline analysis assumes minimal ΛCDM, varies the neutrino masses within a reasonably tight range, fixes the primordial power spectrum tilt, and uses the big bang nucleosynthesis prior on the physical baryon density ωb. In this setup, we find the following late-Universe parameters: Hubble constant H0=(67.9± 1.1) km s−1Mpc−1, matter density fraction Ωm=0.295± 0.010, and the mass fluctuation amplitude σ8=0.721± 0.043. These parameters were measured directly from the BOSS data and independently of the Planck cosmic microwave background observations. Scanning over the power spectrum tilt or relaxing the other priors do not significantly alter our main conclusions. Finally, we discuss the information content of the BOSS power spectrum and show that it is dominated by the location of the baryon acoustic oscillations and the power spectrum shape. We argue that the contribution of the Alcock-Paczynski effect is marginal in ΛCDM, but becomes important for non-minimal cosmological models.

Subfields: Astronomy and Astrophysics, Instrumentation

View Paper: https://www.semanticscholar.org/paper/08b258bb2c7d9d0252b8617aee80d31a24401d21

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Astronomy and Astrophysics

1. Z. Vlah
2. Mikhail Ivanov
3. Shi-Fan Chen
4. O. Philcox
5. M. White
6. M. Simonovi'c
7. M. Zaldarriaga
8. L. Senatore

In Instrumentation

1. Z. Vlah
2. Shi-Fan Chen
3. M. White
4. O. Philcox
5. Mikhail Ivanov
6. M. Zaldarriaga
7. M. Simonovi'c
8. L. Senatore

Citations in the corpus

• Combining full-shape and BAO analyses of galaxy power spectra: a 1.6% CMB-independent constraint on H0 (2020, methodology): “5, comparing the results of the combined FS and BAO analysis to those obtained from a FS only analysis [52] and those of the final Planck data release [1], using the TT,TE,EE+lowE+lowl+lensing data.”
• Consistent modeling of velocity statistics and redshift-space distortions in one-loop perturbation theory (2020, methodology): “ous options to this end are (1) to compute P s(k) for the broadband using P nw only and add in the exponential damping factor for P w by hand, as has been done in recent analyses in the EFT framework [43] or (2) to use the Gaussian streaming model (GSM; [51]) for conguration space analyses employing”
• A new analysis of galaxy 2-point functions in the BOSS survey, including full-shape information and post-reconstruction BAO (2021, methodology): “This work is not the first to analyze galaxy clustering with an effective theory framework, and follows a number of papers analyzing the BOSS redshift space power spectrum using effective Eulerian perturbation theory [26, 27] as well as work by refs.”
• BOSS DR12 full-shape cosmology: ΛCDM constraints from the large-scale galaxy power spectrum and bispectrum monopole (2021, methodology): “05, using the power spectrum multipoles alone), which is somewhat different from that of previous full-shape power spectrum analyses [18, 19, 21, 28].”
• Cosmology Intertwined II: The Hubble Constant Tension (2020, neutral): “[14] M.”