Principal reconstructed modes of dark energy and gravity

Abstract

Recently, in [1], we presented the first combined non-parametric reconstruction of the three time-dependent functions that capture departures from the standard cosmological model, $\Lambda$CDM, in the expansion history and gravitational effects on matter and light from the currently available combination of the background and large scale structure data. The reconstruction was performed with and without a theory-informed prior, built on the general Horndeski class of scalar-tensor theories, that correlates the three functions. In this work, we perform a decomposition of the prior and posterior covariances of the three functions to determine the structure of the modes that are constrained by the data relative to the Horndeski prior. We find that the combination of all data can constrain 15 combined eigenmodes of the three functions with respect to the prior. We examine and interpret their features in view of the well-known tensions between datasets within the $\Lambda$CDM model. We also assess the bias introduced by the simplistic parameterizations commonly used in the literature for constraining deviations from GR on cosmological scales.

19 pages, 6 figures

References in corpus (25)

• The Clustering of the SDSS DR7 Main Galaxy Sample I: A 4 per cent Distance Measure at z=0.15
• The Completed SDSS-IV extended Baryon Oscillation Spectroscopic Survey: Cosmological Implications from two Decades of Spectroscopic Surveys at the Apache Point observatory
• Beyond the Cosmological Standard Model
• Cosmic Distances Calibrated to 1% Precision with Gaia EDR3 Parallaxes and Hubble Space Telescope Photometry of 75 Milky Way Cepheids Confirm Tension with LambdaCDM
• Maximal freedom at minimum cost: linear large-scale structure in general modifications of gravity
• Measuring the dark side (with weak lensing)
• Approaches to Understanding Cosmic Acceleration
• The Completed SDSS-IV extended Baryon Oscillation Spectroscopic Survey: Baryon acoustic oscillations with Lyman-$\alpha$ forests
• The Completed SDSS-IV extended Baryon Oscillation Spectroscopic Survey: measurement of the BAO and growth rate of structure of the luminous red galaxy sample from the anisotropic correlation function between redshifts 0.6 and 1
• Distinguishing Modified Gravity from Dark Energy
• Gaussian Process Cosmography
• Searching for modified growth patterns with tomographic surveys
• Testing gravity with CAMB and CosmoMC
• A unifying description of dark energy
• Effective Field Theory of Cosmic Acceleration: constraining dark energy with CMB data
• How to optimally parametrize deviations from General Relativity in the evolution of cosmological perturbations
• Observables and unobservables in dark energy cosmologies
• Examining the evidence for dynamical dark energy
• Testing the theory of gravity with DESI: estimators, predictions and simulation requirements
• The clustering of galaxies in the completed SDSS-III Baryon Oscillation Spectroscopic Survey: tomographic BAO analysis of DR12 combined sample in Fourier space
• MGCAMB with massive neutrinos and dynamical dark energy
• The clustering of the SDSS-IV extended Baryon Oscillation Spectroscopic Survey DR16 luminous red galaxy and emission line galaxy samples: cosmic distance and structure growth measurements using multiple tracers in configuration space
• Current constraints on deviations from General Relativity using binning in redshift and scale
• Cosmological Tests of Gravity: A Future Perspective
• What does a cosmological experiment really measure? Covariant posterior decomposition with normalizing flows

Cited by in corpus (24)

• The CosmoVerse White Paper: Addressing observational tensions in cosmology with systematics and fundamental physics
• DESI 2024: Reconstructing Dark Energy using Crossing Statistics with DESI DR1 BAO data
• Underdetermination of dark energy
• Hints of Nonminimally Coupled Gravity in DESI 2024 Baryon Acoustic Oscillation Measurements
• Omnipotent dark energy: A phenomenological answer to the Hubble tension
• Dynamical Dark Energy in light of the DESI DR2 Baryonic Acoustic Oscillations Measurements
• Model selection applied to reconstructions of the Dark Energy
• Inevitable manifestation of wiggles in the expansion of the late Universe
• New MGCAMB tests of gravity with CosmoMC and Cobaya
• Exploring new physics in the late Universe's expansion through non-parametric inference
• Reconstructing dark energy with model independent methods after DESI DR2 BAO
• 50 Years of Horndeski Gravity: Past, Present and Future
• Joint reconstructions of growth and expansion histories from stage-IV surveys with minimal assumptions. II. Modified gravity and massive neutrinos
• Combining gravitational lensing and gravitational redshift to measure the anisotropic stress with future galaxy surveys
• Cosmological Probes of Structure Growth and Tests of Gravity
• Non-minimally coupled gravity constraints from DESI DR2 data
• Shape of Dark Energy: Constraining Its Evolution with a General Parametrization
• Do we need wavelets in the late Universe?
• Testing the equivalence principle across the Universe: a model-independent approach with galaxy multi-tracing
• Late Time Modification of Structure Growth and the S8 Tension
• Exploring Modified Gravity: Constraints on the $\mu$ and $\Sigma$ Parametrization with WMAP, ACT, and SPT
• A comprehensive data-driven odyssey to explore the equation of state of dark energy
• Measurement of the Weyl potential evolution from the first three years of Dark Energy Survey data
• Principal Components for Model-Agnostic Modified Gravity with 3x2pt