Extracting high-order cosmological information in galaxy surveys with power spectra

Abstract

The reconstruction method was proposed more than a decade ago to boost the signal of baryonic acoustic oscillations measured in galaxy redshift surveys, which is one of key probes for dark energy. After moving the observed overdensities in galaxy surveys back to their initial position, the reconstructed density field is closer to a linear Gaussian field, with higher-order information moved back into the power spectrum. We find that by jointly analysing power spectra measured from the pre- and post-reconstructed galaxy samples, higher-order information beyond the $2$-point power spectrum can be efficiently extracted, which generally yields an information gain upon the analysis using the pre- or post-reconstructed galaxy sample alone. This opens a window to easily use higher-order information when constraining cosmological models.

38 pages including 4 figures and 1 table, with a Supplement Information document attached; Version accepted to Communications Physics

References in corpus (15)

• The Completed SDSS-IV extended Baryon Oscillation Spectroscopic Survey: Cosmological Implications from two Decades of Spectroscopic Surveys at the Apache Point observatory
• A test of the nature of cosmic acceleration using galaxy redshift distortions
• Galaxy Evolution from Halo Occupation Distribution Modeling of DEEP2 and SDSS Galaxy Clustering
• Improving Cosmological Distance Measurements by Reconstruction of the Baryon Acoustic Peak
• The clustering of galaxies in the completed SDSS-III Baryon Oscillation Spectroscopic Survey: Anisotropic galaxy clustering in Fourier-space
• Constraining $M_{\nu }$ with the Bispectrum II: The Total Information Content of the Galaxy Bispectrum
• Efficient Reconstruction of Linear Baryon Acoustic Oscillations in Galaxy Surveys
• Accurate emulator for the redshift-space power spectrum of dark matter halos and its application to galaxy power spectrum
• Angular power spectrum of galaxies in the 2MASS Redshift Survey
• Information Content of Higher-Order Galaxy Correlation Functions
• Cosmological forecasts for future galaxy surveys with the linear point standard ruler: Toward consistent BAO analyses far from a fiducial cosmology
• Perturbation theory for the redshift-space matter power spectra after reconstruction
• Covariance of the redshift-space matter power spectrum after reconstruction
• Combined full shape analysis of BOSS galaxies and eBOSS quasars using an iterative emulator
• Emulating power spectra for pre- and post-reconstructed galaxy samples

Cited by in corpus (4)

• DESI 2024 V: Full-Shape Galaxy Clustering from Galaxies and Quasars
• A multitracer analysis for the eBOSS galaxy sample based on the effective field theory of large-scale structure
• Neural Network Reconstruction of Non-Gaussian Initial Conditions from Dark Matter Halos
• Modelling the covariance matrix for the power spectra before and after the BAO reconstruction