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Probing homogeneity with standard candles

Journal Article · · Journal of Cosmology and Astroparticle Physics
 [1];  [2];  [1];  [3]
  1. National Taiwan Univ., Taipei (Taiwan)
  2. European Organization for Nuclear Research (CERN), Geneva (Switzerland); Bishop's Univ. (Canada). Dept. of Physics & Astronomy; Univ. de Antioquia (Colombia)
  3. National Taiwan Univ., Taipei (Taiwan); SLAC National Accelerator Lab., Menlo Park, CA (United States)
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We show that standard candles can provide some valuable information about the density contrast, which could be particularly important at redshifts where other observations are not available. We use an inversion method to reconstruct the local radial density profile from luminosity distance observations assuming background cosmological parameters obtained from large scale observations. Using type Ia Supernovae, Cepheids and the cosmological parameters from the Planck mission we reconstruct the radial density profiles along two different directions of the sky. We compare these profiles to other density maps obtained from luminosity density, in particular Keenan et al. 2013 and the 2M++ galaxy catalogue. The method independently confirms the existence of inhomogeneities, could be particularly useful to correctly normalize density maps from galaxy surveys with respect to the average density of the Universe, and could clarify the apparent discrepancy between local and large scale estimations of the Hubble constant. When better observational supernovae data will be available, the accuracy of the reconstructed density profiles will improve and will allow to further investigate the existence of structures whose size is beyond the reach of galaxy surveys.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
1604572
Alternate ID(s):
OSTI ID: 22902276
Journal Information:
Journal of Cosmology and Astroparticle Physics, Journal Name: Journal of Cosmology and Astroparticle Physics Journal Issue: 11 Vol. 2019; ISSN 1475-7516
Publisher:
Institute of Physics (IOP)Copyright Statement
Country of Publication:
United States
Language:
English

References (10)

Discriminating different models of luminosity–redshift distribution journal April 2013
Testing the void against cosmological data: fitting CMB, BAO, SN and H 0 journal November 2010
The magnitude–redshift relation in a perturbed Friedmann universe journal October 1987
Cosmic variance of the local Hubble flow in large-scale cosmological simulations journal December 2013
Inhomogeneous and anisotropic Universe and apparent acceleration journal January 2015
The 2M++ galaxy redshift catalogue text January 2011
The second-order luminosity-redshift relation in a generic inhomogeneous cosmology text January 2012
Average and dispersion of the luminosity-redshift relation in the concordance model text January 2013
Pecular velocities of galaxies in the Leo Spur text January 2015
Peculiar motion away from the Local Void dataset January 2008

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Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
Hubble Parameter
Inhomogeneous Universe
Large Scale Structure
Standard Candles