Rescuing constraints on modified gravity using gravitational redshift in large-scale structure

Abstract

The distribution of galaxies provides an ideal laboratory to test for deviations from General Relativity. In particular, redshift-space distortions are commonly used to constrain modifications to the Poisson equation, which governs the strength of dark matter clustering. Here, we show that these constraints rely on the validity of the weak equivalence principle, which has never been tested for the dark matter component. Relaxing this restrictive assumption leads to modifications in the growth of structure that are fully degenerate with modifications induced by the Poisson equation. This in turns strongly degrades the constraining power of redshift-space distortions. Such degeneracies can however be broken and tight constraints on modified gravity can be recovered by measuring gravitational redshift from the galaxy distribution, an effect that will be detectable by the coming generation of large-scale structure surveys.

arXiv comment8 pages, 3 figures; summary video at https://youtu.be/-xXmfaq0Zsg

References in corpus (43)

• GW170817: Observation of Gravitational Waves from a Binary Neutron Star Inspiral
• The Completed SDSS-IV extended Baryon Oscillation Spectroscopic Survey: Cosmological Implications from two Decades of Spectroscopic Surveys at the Apache Point observatory
• Cosmological Tests of Modified Gravity
• The linear power spectrum of observed source number counts
• What galaxy surveys really measure
• Dark Energy vs. Modified Gravity
• Torsion-balance tests of the weak equivalence principle
• Dark Energy Survey Year 1 Results: Constraints on Extended Cosmological Models from Galaxy Clustering and Weak Lensing
• New Perspective on Galaxy Clustering as a Cosmological Probe: General Relativistic Effects
• Galaxy Cluster Baryon Fractions Revisited
• Correlated Fluctuations in Luminosity Distance and the (Surprising) Importance of Peculiar Motion in Supernova Surveys
• Equivalence Principle Implications of Modified Gravity Models
• Fluctuations of the luminosity distance
• CFHTLenS: Testing the Laws of Gravity with Tomographic Weak Lensing and Redshift Space Distortions
• How to optimally parametrize deviations from General Relativity in the evolution of cosmological perturbations
• Going beyond the Kaiser redshift-space distortion formula: a full general relativistic account of the effects and their detectability in galaxy clustering
• Testing General Relativity on Horizon Scales and the Primordial non-Gaussianity
• Asymmetric galaxy correlation functions
• Effective Theory of Interacting Dark Energy
• Gravitational redshift and other redshift-space distortions of the imaginary part of the power spectrum
• Extending cosmological tests of General Relativity with the Square Kilometre Array
• Measurement of the dipole in the cross-correlation function of galaxies
• New constraints on parametrised modified gravity from correlations of the CMB with large scale structure
• Dark-Energy Instabilities induced by Gravitational Waves
• Inhomogeneous vacuum energy
• Complementarity of Weak Lensing and Peculiar Velocity Measurements in Testing General Relativity
• Effective Theory of Dark Energy at Redshift Survey Scales
• Coupled quintessence with a $\Lambda$CDM background: removing the ${\sigma }_8$ tension
• Galaxy morphology rules out astrophysically relevant Hu-Sawicki $f(R)$ gravity
• Testing the equivalence principle on cosmological scales
• Euclid preparation: XIX. Impact of magnification on photometric galaxy clustering
• Optimising the measurement of relativistic distortions in large-scale structure
• Modeling relativistic contributions to the halo power spectrum dipole
• On structure formation from a small-scales-interacting dark sector
• Cosmological constraints on dark energy in light of gravitational wave bounds
• On the importance of lensing for galaxy clustering in photometric and spectroscopic surveys
• New Gravitational Scales in Cosmological Surveys
• Gravitational redshifts from large-scale structure
• Impact of Relativistic Effects on the Primordial Non-Gaussianity Signature in the Large-Scale Clustering of Quasars
• Parametrized modified gravity constraints after Planck
• Detectability of the gravitational redshift effect from the asymmetric galaxy clustering
• A null test of the equivalence principle using relativistic effects in galaxy surveys
• Testing the equivalence principle on cosmological scales using the odd multipoles of galaxy cross-power spectrum and bispectrum

Cited by in corpus (14)

• The CosmoVerse White Paper: Addressing observational tensions in cosmology with systematics and fundamental physics
• Gravitational Redshift Constraints on the Effective Theory of Interacting Dark Energy
• Modified Einstein versus Modified Euler for Dark Matter
• Combining gravitational lensing and gravitational redshift to measure the anisotropic stress with future galaxy surveys
• Wide-angle effects in the galaxy bispectrum
• 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
• Euclid: Relativistic effects in the dipole of the 2-point correlation function
• Using relativistic effects in large-scale structure to constrain astrophysical properties of galaxy populations
• Measurement of the Weyl potential evolution from the first three years of Dark Energy Survey data
• Comparing the motion of dark matter and standard model particles on cosmological scales
• The Atacama Cosmology Telescope: A Test of the Gravitational Force Law on Cosmological Scales Using the Kinematic Sunyaev-Zeldovich Effect
• A Light-Cone Approach to Higher-Order Cosmological Observables
• Gravitational redshift from large-scale structure: nonlinearities, antisymmetries, and the dipole