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A More Accurate and Competitive Estimative of H0 in Intermediate Redshifts

Authors
  • da Silva, G. Pordeus1
  • Cavalcanti, A. G.1
  • 1 Universidade Federal do Rio Grande do Norte, Departamento de Física Teórica e Experimental, Natal, Rio Grande do Norte, Brasil , Natal (Brazil)
Type
Published Article
Journal
Brazilian Journal of Physics
Publisher
Springer US
Publication Date
Jun 20, 2018
Volume
48
Issue
5
Pages
521–530
Identifiers
DOI: 10.1007/s13538-018-0581-9
Source
Springer Nature
Keywords
License
Yellow

Abstract

In order to clarify the tension between estimates of the Hubble Constant (H0) from local (z ≪ 1) and global (z ≫ 1) measurements, Lima and Cunha (LC) proposed a new method to measure H0 in intermediate redshifts (z ≈ 1), which were obtained H0 = 74.1 ± 2.2 km s− 1Mpc− 1 (1σ), in full agreement to local measurements via Supernovae/Cepheid dataset. However, Holanda et al. (Month. Not. R. Astronom. Soc. Lett. 443(1) L74–L78 (2014)) affirm that a better understanding of the morphology of galaxy clusters in LC framework is needed to a more robust and accurate determination of H0. Moreover, that kind of sample has been strongly questioned in the literature. In this context, (i) we investigated if the sample of galaxy clusters used by LC has a relevant role in their results, then (ii) we perform a more accurate and competitive determination of H0 in intermediate redshifts, free of unknown systematic uncertainties. First, we found that the exclusion of the sample of galaxy clusters from the determination initially proposed by LC leads to significantly different results. Finally, we performed a new determination in H0, where we obtained H0 = 68.00 ± 2.20 km s− 1 Mpc− 1 (1σ) with statistical and systematic errors and H0=68.71−1.45+1.37\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$H_{0} = 68.71^{+ 1.37}_{-1.45}$\end{document} km s− 1 Mpc− 1 (1σ) with statistical errors only. Contrary to those obtained by LC, these values are in full harmony with the global measurements via Cosmic Microwave Background (CMB) radiation and to the other recent estimates of H0 in intermediate redshifts.

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