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

TL;DR

This paper introduces a novel joint analysis method of galaxy two-point functions from the BOSS survey, utilizing full-shape and BAO information through Lagrangian perturbation theory, yielding precise cosmological constraints.

Contribution

It presents a new technique for combined analysis of pre- and post-reconstruction galaxy data using Lagrangian perturbation theory, improving cosmological parameter estimation.

Findings

Constraints on mbda CDM parameters consistent with Planck data

Accurate measurement of the distance-redshift relation and growth rate

Method enables joint analysis without summary statistic approximations

Abstract

We present a new method for consistent, joint analysis of the pre- and post-reconstruction 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 $\Omega_m=0.303 \pm 0.0082$, $H_0=69.23 \pm 0.77$ and $\sigma_8=0.733 \pm 0.047$ within the context of $\Lambda$CDM. These constraints are in good agreement both with the Planck primary CMB anisotropy data and recent cosmic shear surveys.