A model-independent measurement of the expansion and growth rates from BOSS using the FreePower method

Abstract

In this work we provide a data analysis of the BOSS galaxy clustering data with the recently proposed FreePower method, which adopts as parameters the power spectrum band-powers, the expansion rate, and the growth rate instead of specific cosmological parametrizations. It relies on the Alcock-Paczyński effect and redshift-space distortions, and makes use of one-loop perturbation theory for biased tracers. In this way, we obtain for the first time constraints on the linear growth rate, on the Hubble parameter, as well as on the dimensionless distance $H_0{D}_A$ and various bias functions, that are independent of a model for the power spectrum shape and thus of both the early and late-time cosmological modelling. Using weakly-informative priors, requiring basically that ${\sigma }_8\in [0.67,1.07]$ at 95% CI, we find at $z_{\mathrm{eff}}=0.38$, $f=0.67_{-0.19}^{+0.20}$, $H/H_0=1.033_{-0.081}^{+0.13}$, $H_0{D}_A=0.264_{-0.039}^{+0.026}$ and at $z_{\mathrm{eff}}=0.61$, $f=0.82_{-0.20}^{+0.25}$, $H/H_0=1.085_{-0.067}^{+0.16}$, $H_0{D}_A=0.390_{-0.046}^{+0.036}$. We find lower $H/H_0$ results than expected from Planck 2018 $\Lambda$CDM results at a confidence level of 1.7$\sigma$ ($2.1\sigma$) for low-$z$ (high-$z$). These results form a proof-of-principle of the FreePower method. We also get constraints on the bias parameters which are in agreement with constraints from previous BOSS analyses, which serves as a cross-check of our pipeline.

arXiv commentv4: two short new appendices; accepted for publication in Physics of the Dark Universe

References in corpus (52)

• emcee: The MCMC Hammer
• The clustering of galaxies in the completed SDSS-III Baryon Oscillation Spectroscopic Survey: cosmological analysis of the DR12 galaxy sample
• SDSS-III: Massive Spectroscopic Surveys of the Distant Universe, the Milky Way Galaxy, and Extra-Solar Planetary Systems
• The Baryon Oscillation Spectroscopic Survey of SDSS-III
• Large-Scale Structure of the Universe and Cosmological Perturbation Theory
• The Completed SDSS-IV extended Baryon Oscillation Spectroscopic Survey: Cosmological Implications from two Decades of Spectroscopic Surveys at the Apache Point observatory
• The Pantheon+ Analysis: Cosmological Constraints
• DESI 2024 VI: Cosmological Constraints from the Measurements of Baryon Acoustic Oscillations
• Cosmology and Fundamental Physics with the Euclid Satellite
• Why your model parameter confidences might be too optimistic -- unbiased estimation of the inverse covariance matrix
• Large-Scale Galaxy Bias
• Cosmological Non-Linearities as an Effective Fluid
• The Effective Field Theory of Cosmological Large Scale Structures
• The Cosmological Analysis of the SDSS/BOSS data from the Effective Field Theory of Large-Scale Structure
• Cosmological Parameters from the BOSS Galaxy Power Spectrum
• The clustering of galaxies in the SDSS-III Baryon Oscillation Spectroscopic Survey: mock galaxy catalogues for the BOSS Final Data Release
• Dynamic temperature selection for parallel-tempering in Markov chain Monte Carlo simulations
• 4MOST: Project overview and information for the First Call for Proposals
• DESI 2024 III: Baryon Acoustic Oscillations from Galaxies and Quasars
• DESI 2024 IV: Baryon Acoustic Oscillations from the Lyman Alpha Forest
• The Clustering of Galaxies in the SDSS-III Baryon Oscillation Spectroscopic Survey: Including covariance matrix errors
• The IR-resummed Effective Field Theory of Large Scale Structures
• Constraining Early Dark Energy with Large-Scale Structure
• $H_0$ from cosmic chronometers and Type Ia supernovae, with Gaussian Processes and the novel Weighted Polynomial Regression method
• Non-linear perturbation theory extension of the Boltzmann code CLASS
• The Effect of Covariance Estimator Error on Cosmological Parameter Constraints
• Flowing with Time: a New Approach to Nonlinear Cosmological Perturbations
• DESI 2024 VII: Cosmological Constraints from the Full-Shape Modeling of Clustering Measurements
• Halo Stochasticity from Exclusion and non-linear Clustering
• Limits on $w$CDM from the EFTofLSS with the PyBird code
• The miniJPAS survey: a preview of the Universe in 56 colours
• Cosmological Perturbation Theory Using the FFTLog: Formalism and Connection to QFT Loop Integrals
• Constraints on the curvature of the Universe and dynamical dark energy from the Full-shape and BAO data
• Cosmological constraints from BOSS with analytic covariance matrices
• Evidence for suppression of structure growth in the concordance cosmological model
• Precision analysis of the redshift-space galaxy bispectrum
• The BOSS bispectrum analysis at one loop from the Effective Field Theory of Large-Scale Structure
• Consistency of effective field theory analyses of the BOSS power spectrum
• Towards Precision Constraints on Gravity with the Effective Field Theory of Large-Scale Structure
• Cosmological Constraints on Light (but Massive) Relics
• Cosmology with the Wide-Field Infrared Survey Telescope -- Synergies with the Rubin Observatory Legacy Survey of Space and Time
• Constraints on modified gravity from the BOSS galaxy survey
• Effects of cosmological model assumptions on galaxy redshift survey measurements
• The Redshift-Space Momentum Power Spectrum I: Optimal Estimation From Peculiar Velocity Surveys
• A Reference Survey for Supernova Cosmology with the Nancy Grace Roman Space Telescope
• Measuring the Hubble function with standard candle clustering
• Resummed Kinetic Field Theory: general formalism and linear structure growth from Newtonian particle dynamics
• The 6x2pt method: supernova velocities meet multiple tracers
• Fisher matrix for the one-loop galaxy power spectrum: measuring expansion and growth rates without assuming a cosmological model
• Improving precision and accuracy in cosmology with model-independent spectrum and bispectrum
• A model-independent tripartite test of cosmic distance relations
• Fisher matrix for multiple tracers: all you can learn from large-scale structure without assuming a model

Cited by in corpus (2)

• Comparing the motion of dark matter and standard model particles on cosmological scales
• J-PAS: forecast on the primordial power spectrum reconstruction