Cosmic homogeneity: a spectroscopic and model-independent measurement

Abstract

Cosmology relies on the Cosmological Principle, i.e., the hypothesis that the Universe is homogeneous and isotropic on large scales. This implies in particular that the counts of galaxies should approach a homogeneous scaling with volume at sufficiently large scales. Testing homogeneity is crucial to obtain a correct interpretation of the physical assumptions underlying the current cosmic acceleration and structure formation of the Universe. In this Letter, we use the Baryon Oscillation Spectroscopic Survey to make the first spectroscopic and model-independent measurements of the angular homogeneity scale ${\theta }_{\mathrm{h}}$. Applying four statistical estimators, we show that the angular distribution of galaxies in the range 0.46 < z < 0.62 is consistent with homogeneity at large scales, and that ${\theta }_{\mathrm{h}}$ varies with redshift, indicating a smoother Universe in the past. These results are in agreement with the foundations of the standard cosmological paradigm.

arXiv comment5 pages, 2 figures, Version accepted by MNRAS

References in corpus (35)

• Planck 2015 results. XIII. Cosmological parameters
• The Sloan Digital Sky Survey: Technical Summary
• LSST Science Book, Version 2.0
• Cosmology and fundamental physics with the Euclid satellite
• The SDSS-IV extended Baryon Oscillation Spectroscopic Survey: Overview and Early Data
• CMB Anomalies after Planck
• Cosmic homogeneity demonstrated with luminous red galaxies
• Scale-invariance of galaxy clustering
• The WiggleZ Dark Energy Survey: the transition to large-scale cosmic homogeneity
• Detection of the velocity dipole in the radio galaxies of the NRAO VLA Sky Survey
• J-PAS: The Javalambre-Physics of the Accelerated Universe Astrophysical Survey
• Inhomogeneity and the foundations of concordance cosmology
• Establishing homogeneity of the universe in the shadow of dark energy
• Revisiting the NVSS number count dipole
• Is the Universe homogeneous?
• Fractal Dimension as a measure of the scale of Homogeneity
• Baryon Acoustic Oscillations from the SDSS DR10 galaxies angular correlation function
• Homogeneity and isotropy in the 2MASS Photometric Redshift catalogue
• Exploring cosmic homogeneity with the BOSS DR12 galaxy sample
• Seeing patterns in noise: Gigaparsec-scale `structures' that do not violate homogeneity
• A 14 $h^{-3}$ Gpc${}^3$ study of cosmic homogeneity using BOSS DR12 quasar sample
• Measuring the transverse baryonic acoustic scale from the SDSS DR11 galaxies
• Very large scale correlations in the galaxy distribution
• Anisotropy in the all-sky distribution of galaxy morphological types
• Is there evidence for anomalous dipole anisotropy in the large-scale structure?
• Testing homogeneity in the Sloan Digital Sky Survey Data Release Twelve with Shannon entropy
• Testing homogeneity with the fossil record of galaxies
• Cosmology with the SKA -- overview
• The cosmological principle is not in the sky
• Measuring the transition to homogeneity with photometric redshift surveys
• Constraining the local variance of $H_0$ from directional analyses
• North-South non-Gaussian asymmetry in PLANCK CMB maps
• An information theory based search for homogeneity on the largest accessible scale
• Asymmetry in the reconstructed deceleration parameter
• Testing Homogeneity with Galaxy Star Formation Histories

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• A Model-independent Test of Cosmic Isotropy with Low-z Pantheon Supernovae
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• Testing the isotropy of cosmic acceleration with Pantheon+ and SH0ES: A cosmographic analysis
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• A measurement of the scale of homogeneity in the Early Universe
• Measuring the Homogeneity of the Universe Using Polarization Drift
• Mapping Poincaré gauge cosmology to Horndeski theory for emergent dark energy
• Non-parametric reconstructions of cosmic curvature: current constraints and forecasts
• No evidence for anisotropy in galaxy spin directions
• Is the local Hubble flow consistent with concordance cosmology?
• Solving the Hubble tension à la Ellis & Stoeger 1987
• Can the angular scale of cosmic homogeneity be used as a cosmological test?
• Revisiting the CMB homogeneity scale: low multipoles removal effect and extragalactic foreground masking
• Confirming the uniformity of the Hubble flow with Pantheon+ Supernovae