A null test of the Cosmological Principle with BAO measurements

Abstract

The assumption of a Friedmann-Lemaître-Roberton-Walker (FLRW) Universe is one of the fundamental pillars of modern Cosmology. It is crucial to confront it against cosmological observations in order to confirm (or rule out) the validity of the $\Lambda$CDM paradigm. We perform a consistency test of the FLRW metric using measurements of both radial and transversal modes of Baryonic Acoustic Oscillations in a model-independent fashion using Gaussian Processes. The impact of different prior assumptions for the sound horizon scale and the Hubble Constant is also explored. We find a mild deviation of the FLRW hypothesis ($\gtrsim 3\sigma$ confidence level) at lower redshift ranges ($0.1<z<0.3$) under the assumption the SH0ES $H_0$ prior, which does not occur for the $H_0$ prior by Planck. We also find that different reconstruction kernels reduce the statistical significance of such a deviation. At higher reshift ranges, the null test are able to confirm the FLRW assumption within $3\sigma$ confidence level regardless of the priors.

arXiv comment13 pages, 4 figures. Revised manuscript with extended analysis, citations included, and fixed typos. Accepted for publication in Phys. Dark. Univ. Code provided at https://github.com/astrobengaly/null_test_FLRW

References in corpus (63)

• The Complete Light-curve Sample of Spectroscopically Confirmed Type Ia Supernovae from Pan-STARRS1 and Cosmological Constraints from The Combined Pantheon Sample
• In the Realm of the Hubble tension $-$ a Review of Solutions
• The Completed SDSS-IV extended Baryon Oscillation Spectroscopic Survey: Cosmological Implications from two Decades of Spectroscopic Surveys at the Apache Point observatory
• Dark Energy Survey Year 3 Results: Cosmological Constraints from Galaxy Clustering and Weak Lensing
• KiDS-1000 Cosmology: Multi-probe weak gravitational lensing and spectroscopic galaxy clustering constraints
• Two new diagnostics of dark energy
• Reconstruction of dark energy and expansion dynamics using Gaussian processes
• Hubble Parameter and Baryon Acoustic Oscillation Measurement Constraints on the Hubble Constant, the Deviation from the Spatially-Flat $\Lambda$cdm Model, The Deceleration-Acceleration Transition Redshift, and Spatial Curvature
• Gaussian Process Cosmography
• A Test of the Cosmological Principle with Quasars
• To H0 or not to H0?
• Distance measures in cosmology
• A general test of the Copernican Principle
• $H_0$ from cosmic chronometers and Type Ia supernovae, with Gaussian Processes and the novel Weighted Polynomial Regression method
• Evidence for anisotropy of cosmic acceleration
• Probing cosmic isotropy with a new X-ray galaxy cluster sample through the $L_{\text{X}}-T$ scaling relation
• Does Hubble Tension Signal a Breakdown in FLRW Cosmology?
• The Cardassian expansion revisited: constraints from updated Hubble parameter measurements and Type Ia Supernovae data
• A litmus test for Lambda
• Inhomogeneity and the foundations of concordance cosmology
• Model independent tests of the standard cosmological model
• Establishing homogeneity of the universe in the shadow of dark energy
• An improved model-independent assessment of the late-time cosmic expansion
• New test of the FLRW metric using the distance sum rule
• Probing the Cosmological Principle in the counts of radio galaxies at different frequencies
• Is the Universe homogeneous?
• Evidence for a Lower Value for $H_0$ from Cosmic Chronometers Data?
• Curvature vs Distances: testing the FLRW cosmology
• Null tests of the cosmological constant using supernovae
• Cosmological parameter analyses using transversal BAO data
• Chameleon dark energy can resolve the Hubble tension
• The length of the low-redshift standard ruler
• Angular Baryon Acoustic Oscillation measure at z=2.225 from the SDSS quasar survey
• Baryon Acoustic Oscillations from the SDSS DR10 galaxies angular correlation function
• Model-independent test of the FLRW metric, the flatness of the Universe, and non-local measurement of $H_0{r}_{\mathrm{d}}$
• Two new tests to the distance duality relation with galaxy clusters
• BAO angular scale at z_eff = 0.11 with the SDSS blue galaxies
• Model-independent constraints on the cosmic opacity
• Model independent inference of the expansion history and implications for the growth of structure
• Measuring the transverse baryonic acoustic scale from the SDSS DR11 galaxies
• Constraining Teleparallel Gravity through Gaussian Processes
• Novel null tests for the spatial curvature and homogeneity of the Universe and their machine learning reconstructions
• Non-parametric reconstruction of the cosmological \textit{jerk} parameter
• Quantifying the evidence for the current speed-up of the Universe with low and intermediate-redshift data. A more model-independent approach
• Towards a model-independent reconstruction approach for late-time Hubble data
• A data-driven Reconstruction of Horndeski gravity via the Gaussian processes
• Model Comparison of $\Lambda$CDM vs $R_h=ct$ using Cosmic Chronometers
• Null tests of the standard model using the linear model formalism
• Machine Learning improved fits of the sound horizon at the baryon drag epoch
• Machine Learning meets the redshift evolution of the CMB Temperature
• Evidence for cosmic acceleration with next-generation surveys: A model-independent approach
• A model-independent reconstruction of dark sector interactions
• Non-parametric reconstruction of cosmological matter perturbations
• Testing homogeneity with the fossil record of galaxies
• Debiasing Cosmic Gravitational Wave Sirens
• Peculiar motion of Solar system from the Hubble diagram of supernovae Ia and its implications for cosmology
• The Hubble constant tension with next-generation galaxy surveys
• Multi-tasking the growth of cosmological structures
• Galaxy correlations and the BAO in a void universe: structure formation as a test of the Copernican Principle
• Measuring the Homogeneity of the Universe Using Polarization Drift
• Null tests of the concordance model in the era of Euclid and the SKA
• Complementary consistency test of the Copernican principle via Noether's theorem and machine learning forecasts
• Solar system peculiar motion from the Hubble diagram of quasars and testing the Cosmological Principle

Cited by in corpus (11)

• Challenges for $\Lambda$CDM: An update
• Is the Observable Universe Consistent with the Cosmological Principle?
• Nonparametric late-time expansion history reconstruction and implications for the Hubble tension in light of recent DESI and type Ia supernovae data
• Reconstruction of the dark sectors' interaction: A model-independent inference and forecast from GW standard sirens
• Improved null tests of $\Lambda$CDM and FLRW in light of DESI DR2
• Testing the cosmic distance duality relation with Type Ia supernova and transverse BAO measurements
• A study of Dipolar Signal in distant Quasars with various observables
• Hubble constant by natural selection: Evolution chips in the Hubble tension
• Gaussian discriminators between $\Lambda$CDM and wCDM cosmologies using expansion data
• Diagnostic Consistency Tests of the Concordance Cosmology
• A model-independent test of speed of light variability with cosmological observations