Cosmological forecasts for future galaxy surveys with the linear point standard ruler: Toward consistent BAO analyses far from a fiducial cosmology

Abstract

The linear point (LP) standard ruler was identified as the basis of a purely geometric method for exploiting the Baryon Acoustic Oscillations (BAO). The LP exploits the BAO feature imprinted in the galaxy two-point correlation function to measure cosmological distances independent of any specific cosmological model. We forecast the expected precision of future and ongoing spectroscopic galaxy surveys to measure distances leveraging the linear point. We investigate the cosmological implications of our forecasted results. We focus in particular on a relevant working example: the detection of the late-time cosmic acceleration independent of other cosmological probes. Our findings show that, even within the LCDM standard cosmological paradigm, estimated distances need to be reliable over a very wide parameter range in order to realize their maximum utility. This is particularly relevant if we aim to properly characterize cosmological tensions. The LP is a promising candidate approach to achieve this reliability. In contrast, widely employed procedures in BAO analysis estimate distances keeping fixed cosmological parameters to fiducial values close to cosmic-microwave-background constraints in flat-LCDM. It is unclear whether they are purely geometric methods. Moreover, they rely on untested extrapolations to explore the parameter space away from those fiducial flat-LCDM values. We recommend that all BAO methodologies be validated across the full range of models and parameters over which their results are quoted, first by means of linear predictions and then N-body simulations.

arXiv comment17 pages, 2 figures, 6 tables. Revised to match version published by PRD

References in corpus (51)

• Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant
• Measurements of Omega and Lambda from 42 High-Redshift Supernovae
• Planck 2015 results. XIII. Cosmological parameters
• Wilkinson Microwave Anisotropy Probe (WMAP) Three Year Results: Implications for Cosmology
• Planck 2013 results. XVI. Cosmological parameters
• The Completed SDSS-IV extended Baryon Oscillation Spectroscopic Survey: Cosmological Implications from two Decades of Spectroscopic Surveys at the Apache Point observatory
• Karhunen-Loeve eigenvalue problems in cosmology: how should we tackle large data sets?
• Challenges for $\Lambda$CDM: An update
• Cosmological implications of baryon acoustic oscillation (BAO) measurements
• A 2% Distance to z=0.35 by Reconstructing Baryon Acoustic Oscillations - I : Methods and Application to the Sloan Digital Sky Survey
• Extragalactic Science, Cosmology and Galactic Archaeology with the Subaru Prime Focus Spectrograph (PFS)
• 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
• CMB Anomalies after Planck
• Parameterization of Dark-Energy Properties: a Principal-Component Approach
• Measuring D_A and H at z=0.35 from the SDSS DR7 LRGs using baryon acoustic oscillations
• The evidence for a spatially flat Universe
• The clustering of galaxies in the SDSS-III Baryon Oscillation Spectroscopic Survey: Baryon Acoustic Oscillations in the correlation function of LOWZ and CMASS galaxies in Data Release 12
• `Eppur Si Muove': On The Motion of the Acoustic Peak in the Correlation Function
• Non-linear structure formation and the acoustic scale
• Gaussian covariance matrices for anisotropic galaxy clustering measurements
• Marginal evidence for cosmic acceleration from Type Ia supernovae
• A 2% Distance to z=0.35 by Reconstructing Baryon Acoustic Oscillations - II: Fitting Techniques
• The High Latitude Spectroscopic Survey on the Nancy Grace Roman Space Telescope
• A new method to build the (inverse) distance ladder
• Tracing The Sound Horizon Scale With Photometric Redshift Surveys
• ShapeFit: extracting the power spectrum shape information in galaxy surveys beyond BAO and RSD
• Covariance of cross-correlations: towards efficient measures for large-scale structure
• Cosmological constraints from baryon acoustic oscillations and clustering of large-scale structure
• The Impact of the Fiducial Cosmology Assumption on BAO Cosmological Parameter Inference
• Testing Low-Redshift Cosmic Acceleration with Large-Scale Structure
• Full-Shape Galaxy Power Spectra and the Curvature Tension
• Robustness of baryon acoustic oscillation constraints for early-Universe modifications to $\Lambda$CDM
• Model selection as a science driver for dark energy surveys
• Cosmological parameters from the likelihood analysis of the galaxy power spectrum and bispectrum in real space
• Cosmic distance inference from purely geometric BAO methods: Linear Point standard ruler and Correlation Function Model Fitting
• Perturbation theory challenge for cosmological parameters estimation: Matter power spectrum in real space
• Linear Point and Sound Horizon as Purely Geometric standard rulers
• A fast semi-discrete optimal transport algorithm for a unique reconstruction of the early Universe
• The effects of massive neutrinos on the linear point of the correlation function
• Beating non-linearities: improving the Baryon Acoustic Oscillations with the linear point
• Isotropic vs. Anisotropic components of BAO data: a tool for model selection
• The Linear Point: A cleaner cosmological standard ruler
• Quantifying the accuracy of the Alcock-Paczynski scaling of baryon acoustic oscillation measurements
• Precise Measurement of the Radial Baryon Acoustic Oscillation Scales in Galaxy Redshift Surveys
• The Linear Point Standard Ruler for galaxy survey data: validation with mock catalogues
• Optimal Transport Reconstruction of Baryon Acoustic Oscillations
• Accurate Baryon Acoustic Oscillations reconstruction via semi-discrete optimal transport
• A first model-independent radial BAO constraint from the final BOSS sample
• Cosmological Model Parameter Dependence of the Matter Power Spectrum Covariance from the DEUS-PUR $Cosmo$ Simulations
• Laguerre reconstruction of the BAO feature in halo-based mock galaxy catalogues

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