Extending cosmological tests of General Relativity with the Square Kilometre Array

Abstract

Tests of general relativity (GR) are still in their infancy on cosmological scales, but forthcoming experiments promise to greatly improve their precision over a wide range of distance scales and redshifts. One such experiment, the Square Kilometre Array (SKA), will carry out several wide and deep surveys of resolved and unresolved neutral hydrogen (HI) 21cm line-emitting galaxies, mapping a significant fraction of the sky from $0\le z\lesssim 6$. I present forecasts for the ability of a suite of possible SKA HI surveys to detect deviations from GR by reconstructing the cosmic expansion and growth history. SKA Phase 1 intensity mapping surveys can achieve sub-1\% measurements of $f{\sigma }_8$ out to $z\approx 1$, with an SKA1-MID Band 2 survey out to $z\lesssim 0.6$ able to surpass contemporary spectroscopic galaxy surveys such as DESI and Euclid in terms of constraints on modified gravity parameters if challenges such as foreground contamination can be tackled effectively. A more futuristic Phase 2 HI survey of $\sim 10^9$ spectroscopic galaxy redshifts would be capable of detecting a $\sim 2\%$ modification of the Poisson equation out to $z\approx 2$.

Updated to match published version - minor additions only

References in corpus (47)

• Beyond the Cosmological Standard Model
• A test of the nature of cosmic acceleration using galaxy redshift distortions
• A Parameterized Post-Friedmann Framework for Modified Gravity
• Report of the Dark Energy Task Force
• Baryon Acoustic Oscillation Intensity Mapping as a Test of Dark Energy
• Measurement of 21 cm brightness fluctuations at z ~ 0.8 in cross-correlation
• Late-time cosmology with 21cm intensity mapping experiments
• Observational Tests of Modified Gravity
• Dark Energy versus Modified Gravity
• Possibility of Precise Measurement of the Cosmological Power Spectrum With a Dedicated 21cm Survey After Reionization
• A Method for 21cm Power Spectrum Estimation in the Presence of Foregrounds
• Linking Tests of Gravity On All Scales: from the Strong-Field Regime to Cosmology
• Testing General Relativity with 21 cm intensity mapping
• Foregrounds in Wide-Field Redshifted 21 cm Power Spectra
• Observables and unobservables in dark energy cosmologies
• Blind foreground subtraction for intensity mapping experiments
• Ultra large-scale cosmology in next-generation experiments with single tracers
• Constraining ultra large-scale cosmology with multiple tracers in optical and radio surveys
• Observational constraints on the linear fluctuation growth rate
• Findings of the Joint Dark Energy Mission Figure of Merit Science Working Group
• Will point sources spoil 21 cm tomography?
• Cosmological performance of SKA HI galaxy surveys
• Galaxy Bias and its Effects on the Baryon Acoustic Oscillations Measurements
• N-Body Simulations of Alternate Gravity Models
• Fast simulations for intensity mapping experiments
• Nonlinear growth in modified gravity theories of dark energy
• Simulations for single-dish intensity mapping experiments
• Theories of Dark Energy with Screening Mechanisms
• Extracting HI cosmological signal with Generalized Needlet Internal Linear Combination
• The foreground wedge and 21 cm BAO surveys
• Searching for Modified Gravity: Scale and Redshift Dependent Constraints from Galaxy Peculiar Velocities
• Observational signatures of modified gravity on ultra-large scales
• New Gravitational Scales in Cosmological Surveys
• A Future Test of Gravitation Using Galaxy Cluster Velocities
• Prospects for clustering and lensing measurements with forthcoming intensity mapping and optical surveys
• $\nu$Galileon: modified gravity with massive neutrinos as a testable alternative to $\Lambda$CDM
• Probing non-standard gravity with the growth index: a background independent analysis
• Quintessence in a quandary: prior dependence in dark energy models
• The Hubble constant and new discoveries in cosmology
• Exploring degeneracies in modified gravity with weak lensing
• Spectroscopic Confusion: Its Impact on Current and Future Extragalactic HI Surveys
• Weak gravitational lensing with the Square Kilometre Array
• Real time cosmology - A direct measure of the expansion rate of the Universe
• Lectures on Screened Modified Gravity
• Model-independent constraints on dark energy and modified gravity with the SKA
• SKA Engineering Change Proposal: Gridded Visibilities to Enable Precision Cosmology with Radio Weak Lensing
• The Billion Galaxy Cosmological HI Large Deep Survey

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• Fundamental Physics with the Square Kilometre Array
• Cosmology with Phase 1 of the Square Kilometre Array; Red Book 2018: Technical specifications and performance forecasts
• General Relativity and Cosmology: Unsolved Questions and Future Directions
• Line-Intensity Mapping: 2017 Status Report
• Cosmology in the era of Euclid and the Square Kilometre Array
• Coupled quintessence with a $\Lambda$CDM background: removing the ${\sigma }_8$ tension
• High-redshift post-reionization cosmology with 21cm intensity mapping
• Testing the equivalence principle on cosmological scales
• Prospects for Constraining Interacting Dark Energy Models with 21 cm Intensity Mapping Experiments
• Inflation and Early Dark Energy with a Stage II Hydrogen Intensity Mapping Experiment
• Reconstructing cosmic growth with kSZ observations in the era of Stage IV experiments
• Higgs-Dilaton Cosmology: An inflation - dark energy connection and forecasts for future galaxy surveys
• Magnification and evolution biases in large-scale structure surveys
• The road ahead of Horndeski: cosmology of surviving scalar-tensor theories
• Cosmological parameter forecasts for HI intensity mapping experiments using the angular power spectrum
• On the importance of lensing for galaxy clustering in photometric and spectroscopic surveys
• Prospects for clustering and lensing measurements with forthcoming intensity mapping and optical surveys
• Probing the primordial Universe with MeerKAT and DES
• Dipolar modulation in the size of galaxies: The effect of Doppler magnification
• Spatial curvature endgame: Reaching the limit of curvature determination
• The foreground transfer function for HI intensity mapping signal reconstruction: MeerKLASS and precision cosmology applications
• Probing primordial features with next-generation photometric and radio surveys
• Evidence for cosmic acceleration with next-generation surveys: A model-independent approach
• Constraining the Expansion History and Early Dark Energy with Line Intensity Mapping
• Diagnostic of Horndeski Theories
• Gravitational Redshift Constraints on the Effective Theory of Interacting Dark Energy
• The Hubble constant tension with next-generation galaxy surveys
• Testing gravity at large scales with HI intensity mapping
• Rescuing constraints on modified gravity using gravitational redshift in large-scale structure
• A null test of the equivalence principle using relativistic effects in galaxy surveys
• Synergies between radio, optical and microwave observations at high redshift
• General Modified Gravity With 21cm Intensity Mapping: Simulations and Forecast
• Constraints on the growth rate using the observed galaxy power spectrum
• Ultra-large-scale approximations and galaxy clustering: debiasing constraints on cosmological parameters
• Constraining the growth rate by combining multiple future surveys
• A new estimator for gravitational lensing using galaxy and intensity mapping surveys
• A null test to probe the scale-dependence of the growth of structure as a test of General Relativity
• Combining gravitational lensing and gravitational redshift to measure the anisotropic stress with future galaxy surveys
• Measuring the distortion of time with relativistic effects in large-scale structure
• Observing the dark sector
• Testing General Relativity with the Doppler magnification effect
• Null tests of the concordance model in the era of Euclid and the SKA
• Non-commutative effects on gravitational measurements
• Probing the primordial Universe with 21-cm line from cosmic dawn/epoch of reionization
• Impact of $1/f$ noise on cosmological parameter constraints for SKA intensity mapping
• Forecasts of cosmological constraints from HI intensity mapping with FAST, BINGO & SKA-I
• Redshift-space distortions from vector perturbations
• Linear Density Perturbations in Multifield Coupled Quintessence
• Post-reionization HI 21-cm signal: A probe of negative cosmological constant
• Imprints of primordial magnetic fields on intrinsic alignments of galaxies
• Testing the equivalence principle across the Universe: a model-independent approach with galaxy multi-tracing
• Disentangling modified gravity from a dark force with gravitational redshift
• Searching for dark energy in the matter-dominated era
• High-redshift test of gravity using enhanced growth of small structures probed by the neutral hydrogen distribution
• The flat-sky approximation to galaxy number counts -- redshift space correlation function
• Cosmology in the non-linear regime : the small scale miracle
• Detectable Data-driven Features in the Primordial Scalar Power Spectrum
• A new observable for cosmic shear
• Sensitivity of Cosmological Parameter Estimation to Nonlinear Prescription from Galaxy Clustering
• Gravitational measurements in higher dimensions
• Redshift weighted galaxy number counts
• On the $2^{\text{nd}}$ feature of the matter two-point function
• Using relativistic effects in large-scale structure to constrain astrophysical properties of galaxy populations
• Relativistic imprints on dispersion measure space distortions
• Model-Independent Test for Gravity using Intensity Mapping and Galaxy Clustering
• Tests of General Relativity: A Review
• The slingshot effect as a probe of transverse motions of galaxies
• The string theory swampland in the Euclid, SKA and Vera Rubin observatory era
• Linear and non-linear Modified Gravity forecasts with future surveys
• Multipoles of the galaxy bispectrum on a light cone: wide-separation and relativistic corrections
• Probing Interacting Dark Sectors with upcoming Post-Reionization and Galaxy Surveys
• Generalized local ansatz for scale-dependent primordial non-Gaussianities and future galaxy surveys
• Constraining the growth rate on linear scales by combining SKAO and DESI surveys
• Redshift-space distortion from dynamical dark energy with time-dependent Lagrangian perturbation theory
• Sensitivity of Cosmological Parameter Estimation to Nonlinear Prescription from Cosmic Shear