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Title: Measuring the homogeneity of the universe using polarization drift

Abstract

We propose a method to probe the homogeneity of a general universe, without assuming symmetry. We show that isotropy can be tested at remote locations on the past lightcone by comparing the line-of-sight and transverse expansion rates, using the time dependence of the polarization of Cosmic Microwave Background photons that have been inverse-Compton scattered by the hot gas in massive clusters of galaxies. This probes a combination of remote transverse and parallel components of the expansion rate of the metric, and we may use radial baryon acoustic oscillations or cosmic clocks to measure the parallel expansion rate. Thus we can test remote isotropy, which is a key requirement of a homogeneous universe. We provide explicit formulas that connect observables and properties of the metric.

Authors:
 [1];  [2];  [3];  [4];  [5];  [1]
  1. Univ. of Barcelona, Barcelona (Spain); ICREA, Barcelona (Spain)
  2. Univ. of the Western Cape, Cape Town (South Africa); Univ. of Portsmouth (United Kingdom)
  3. Univ. of Barcelona, Barcelona (Spain)
  4. Dartmouth College, Hanover, NH (United States)
  5. Imperial College London, London (United Kingdom). Imperial Centre for Inference and Cosmology
Publication Date:
Research Org.:
Dartmouth College, Hanover, NH (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
OSTI Identifier:
1593382
Grant/Contract Number:  
SC0010386
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Cosmology and Astroparticle Physics
Additional Journal Information:
Journal Volume: 2019; Journal Issue: 05; Journal ID: ISSN 1475-7516
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; Early Universe; Gravity

Citation Formats

Jimenez, Raul, Maartens, Roy, Khalifeh, Ali Rida, Caldwell, Robert R., Heavens, Alan F., and Verde, Licia. Measuring the homogeneity of the universe using polarization drift. United States: N. p., 2019. Web. doi:10.1088/1475-7516/2019/05/048.
Jimenez, Raul, Maartens, Roy, Khalifeh, Ali Rida, Caldwell, Robert R., Heavens, Alan F., & Verde, Licia. Measuring the homogeneity of the universe using polarization drift. United States. doi:10.1088/1475-7516/2019/05/048.
Jimenez, Raul, Maartens, Roy, Khalifeh, Ali Rida, Caldwell, Robert R., Heavens, Alan F., and Verde, Licia. Tue . "Measuring the homogeneity of the universe using polarization drift". United States. doi:10.1088/1475-7516/2019/05/048.
@article{osti_1593382,
title = {Measuring the homogeneity of the universe using polarization drift},
author = {Jimenez, Raul and Maartens, Roy and Khalifeh, Ali Rida and Caldwell, Robert R. and Heavens, Alan F. and Verde, Licia},
abstractNote = {We propose a method to probe the homogeneity of a general universe, without assuming symmetry. We show that isotropy can be tested at remote locations on the past lightcone by comparing the line-of-sight and transverse expansion rates, using the time dependence of the polarization of Cosmic Microwave Background photons that have been inverse-Compton scattered by the hot gas in massive clusters of galaxies. This probes a combination of remote transverse and parallel components of the expansion rate of the metric, and we may use radial baryon acoustic oscillations or cosmic clocks to measure the parallel expansion rate. Thus we can test remote isotropy, which is a key requirement of a homogeneous universe. We provide explicit formulas that connect observables and properties of the metric.},
doi = {10.1088/1475-7516/2019/05/048},
journal = {Journal of Cosmology and Astroparticle Physics},
number = 05,
volume = 2019,
place = {United States},
year = {2019},
month = {5}
}

Journal Article:
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This content will become publicly available on May 28, 2020
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