Cosmological constraints without fingers of God

Abstract

Non-linear redshift-space distortions ("fingers of God") are challenging to model analytically, a fact that limits the applicability of perturbation theory in redshift space as compared to real space. We show how this problem can be mitigated using a new observable, $Q_0$, which can be easily estimated from the redshift space clustering data and is approximately equal to the real space power spectrum. The new statistic does not suffer from fingers of God and can be accurately described with perturbation theory down to $k_{\max }\simeq 0.4h{\text{Mpc}}^{-1}$. It can be straightforwardly included in the likelihood at negligible additional computational cost, and yields noticeable improvements on cosmological parameters compared to standard power spectrum multipole analyses. Using both simulations and observational data from the Baryon Oscillation Spectroscopic Survey, we show that improvements vary from $10\%$ to $100\%$ depending on the cosmological parameter considered, the galaxy sample and the survey volume.

29 pages, 6 figures, minor edits, new BOSS likelihood used, available at github.com/oliverphilcox/full_shape_likelihoods

References in corpus (10)

• The DESI Experiment Part I: Science,Targeting, and Survey Design
• The Effective Field Theory of Cosmological Large Scale Structures
• The clustering of galaxies in the completed SDSS-III Baryon Oscillation Spectroscopic Survey: Anisotropic galaxy clustering in Fourier-space
• Redshift-Space Distortions in Lagrangian Perturbation Theory
• Consistent Modeling of Velocity Statistics and Redshift-Space Distortions in One-Loop Perturbation Theory
• The clustering of galaxies in the completed SDSS-III Baryon Oscillation Spectroscopic Survey: Cosmological implications of the Fourier space wedges of the final sample
• Precision analysis of the redshift-space galaxy bispectrum
• Redshift Space Distortions in the Effective Field Theory of Large Scale Structures
• Cosmological constraints from the power spectrum of eBOSS emission line galaxies
• Luminous Red Galaxy Halo Density Field Reconstruction and Application to Large Scale Structure Measurements

Cited by in corpus (33)

• Constraints on Multi-Field Inflation from the BOSS Galaxy Survey
• Constraints on Single-Field Inflation from the BOSS Galaxy Survey
• Cosmology with the Galaxy Bispectrum Multipoles: Optimal Estimation and Application to BOSS Data
• Ultra-light axions and the $S_8$ tension: joint constraints from the cosmic microwave background and galaxy clustering
• The state of the dark energy equation of state circa 2023
• Determining the Hubble Constant without the Sound Horizon: A $3.6\%$ Constraint on $H_0$ from Galaxy Surveys, CMB Lensing and Supernovae
• Constraints on modified gravity from the BOSS galaxy survey
• Cosmological inference from the EFTofLSS: the eBOSS QSO full-shape analysis
• Self-Interacting Neutrinos in Light of Large-Scale Structure Data
• Cosmological constraints from the power spectrum of eBOSS quasars
• Full-shape BOSS constraints on dark matter interacting with dark radiation and lifting the $S_8$ tension
• Updating non-standard neutrinos properties with Planck-CMB data and full-shape analysis of BOSS and eBOSS galaxies
• Observational constraints on early dark energy
• The two-mode puzzle: Confronting self-interacting neutrinos with the full shape of the galaxy power spectrum
• A Parameter-Masked Mock Data Challenge for Beyond-Two-Point Galaxy Clustering Statistics
• Testing signatures of phantom crossing through full-shape galaxy clustering analysis
• The Power of Locality: Primordial Non-Gaussianity at the Map Level
• Taming redshift-space distortion effects in the EFTofLSS and its application to data
• Strong constraints on a simple self-interacting neutrino cosmology
• Cosmological constraints from the cross-correlation of DESI Luminous Red Galaxies with CMB lensing from Planck PR4 and ACT DR6
• Studying large-scale structure probes of modified gravity with COLA
• A critical discussion on the $H_0$ tension
• Improving precision and accuracy in cosmology with model-independent spectrum and bispectrum
• Exploring neutrino interactions in light of present and upcoming galaxy surveys
• Cosmology from Planck CMB Lensing and DESI DR1 Quasar Tomography
• Bounds on Velocity-Dependent Dark Matter-Baryon Scattering from Large-Scale Structure
• Selecting samples of galaxies with fewer Fingers-of-God
• Reducing nuisance prior sensitivity via non-linear reparameterization, with application to EFT analyses of large-scale structure
• Updated neutrino mass constraints from galaxy clustering and CMB lensing-galaxy cross-correlation measurements
• The Effective Field Theory of Large Scale Structure for Mixed Dark Matter Scenarios
• New tests of dark sector interactions from the full-shape galaxy power spectrum
• On the range of validity of perturbative models for galaxy clustering and its uncertainty
• Cosmology with the Redshift-Space Galaxy Bispectrum Monopole at One-Loop Order