Beyond CDM with low and high redshift data: implications for dark energy
Aug 20, 2018
10 pages
Published in:
- Gen.Rel.Grav. 52 (2020) 2, 15
- Published: Feb 7, 2020
e-Print:
- 1808.06623 [astro-ph.CO]
Report number:
- IPM/P-2018/064
View in:
Citations per year
Abstract: (Springer)
Assuming that the Universe at higher redshifts ( and beyond) is consistent with CDM model as constrained by the Planck measurements, we reanalyze the low redshift cosmological data to reconstruct the Hubble parameter as a function of redshift. This enables us to address the and other tensions between low z observations and high z Planck measurement from CMB. From the reconstructed H(z), we compute the energy density for the “dark energy” sector of the Universe as a function of redshift without assuming a specific model for dark energy. We find that the dark energy density has a minimum for certain redshift range and that the value of dark energy at this minimum is negative. This behavior can most simply be described by a negative cosmological constant plus an evolving dark energy component. We discuss possible theoretical and observational implications of such a scenario.Note:
- v3: 10 pages, 12 .pdf figure, matching the published version
- Dark energy
- Low redshift data
- CMB
- H0\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}\end{document} tension
- cosmological constant: negative
- dark energy: density
- redshift: high
- redshift: low
- phantom: crossing
- energy: density
References(0)
Figures(12)
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