Work

A new analysis of galaxy 2-point functions in the BOSS survey, including full-shape information and post-reconstruction BAO

Year: 2022

Type: article

Abstract: We present a new method for consistent, joint analysis of the pre- and post-reconstruction galaxy two-point functions of the BOSS survey. The post-reconstruction correlation function is used to accurately measure the distance-redshift relation and expansion history, while the pre-reconstruction power spectrum multipoles constrain the broad-band shape and the rate-of-growth of large-scale structure. Our technique uses Lagrangian perturbation theory to self-consistently work at the level of two-point functions, i.e. directly with the measured data, without approximating the constraints with summary statistics normalized by the drag scale. Combining galaxies across the full redshift range and both hemispheres we constrain Ωm = 0.303 ± 0.0082, H 0 = 69.23 ± 0.77 and σ8 = 0.733 ± 0.047 within the context of ΛCDM. These constraints are consistent both with the Planck primary CMB anisotropy data and recent cosmic shear surveys.

Source: Journal of Cosmology and Astroparticle Physics

DOI: 10.1088/1475-7516/2022/02/008

Authors: Shi-Fan Chen, Zvonimir Vlah, Martin White

Institutions: University of California, Berkeley, University of Cambridge, Ruđer Bošković Institute

Language: English

Topic: Cosmology and Gravitation Theories

Subfield: Astronomy and Astrophysics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

Funders: National Science Foundation, U.S. Department of Energy

Awards: Graduate Research Fellowship Program, G7317432133, Testing General Relativity with Galaxy Surveys