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Title: Probing homogeneity with standard candles

Abstract

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.

Authors:
 [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)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1604572
Grant/Contract Number:  
AC02-76SF00515
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Cosmology and Astroparticle Physics
Additional Journal Information:
Journal Volume: 2019; Journal Issue: 11; Journal ID: ISSN 1475-7516
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; Hubble Parameter; Standard Candles; Inhomogeneous Universe; Large Scale Structure

Citation Formats

Chiang, Hsu-Wen, Romano, Antonio Enea, Nugier, Fabien, and Chen, Pisin. Probing homogeneity with standard candles. United States: N. p., 2019. Web. https://doi.org/10.1088/1475-7516/2019/11/016.
Chiang, Hsu-Wen, Romano, Antonio Enea, Nugier, Fabien, & Chen, Pisin. Probing homogeneity with standard candles. United States. https://doi.org/10.1088/1475-7516/2019/11/016
Chiang, Hsu-Wen, Romano, Antonio Enea, Nugier, Fabien, and Chen, Pisin. Thu . "Probing homogeneity with standard candles". United States. https://doi.org/10.1088/1475-7516/2019/11/016. https://www.osti.gov/servlets/purl/1604572.
@article{osti_1604572,
title = {Probing homogeneity with standard candles},
author = {Chiang, Hsu-Wen and Romano, Antonio Enea and Nugier, Fabien and Chen, Pisin},
abstractNote = {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.},
doi = {10.1088/1475-7516/2019/11/016},
journal = {Journal of Cosmology and Astroparticle Physics},
number = 11,
volume = 2019,
place = {United States},
year = {2019},
month = {11}
}

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