Simple-graduated dark energy and spatial curvature
| Autor: | J. Alberto Vázquez, Özgür Akarsu, Giovanni Acquaviva, Nihan Katırcı |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Physics
Cosmology and Nongalactic Astrophysics (astro-ph.CO) media_common.quotation_subject Null (mathematics) Order (ring theory) FOS: Physical sciences Cosmological constant General Relativity and Quantum Cosmology (gr-qc) Astrophysics::Cosmology and Extragalactic Astrophysics Universe General Relativity and Quantum Cosmology Baryon De Sitter universe Dark energy Flatness (cosmology) Mathematical physics media_common Astrophysics - Cosmology and Nongalactic Astrophysics |
| Zdroj: | INSPIRE-HEP |
| Popis: | In this work, we first discuss the possibility that dark energy models with negative energy density values in the past can alleviate the $H_0$ tension, as well as the discrepancy with the baryon acoustic oscillation (BAO) Lyman-$\alpha$ data, both which prevail within the $\Lambda$CDM model. We then investigate whether two minimal extensions of the $\Lambda$CDM model, together or separately, can successfully realize such a scenario: (i) the spatial curvature, which, in the case of spatially closed universe, mimics a negative density source and (ii) simple-graduated dark energy (gDE), which promotes the null inertial mass density of the usual vacuum energy to an arbitrary constant--if negative, the corresponding energy density decreases with redshift similar to the phantom models, but unlike them crosses below zero at a certain redshift. We find that, when the Planck data are not included in the observational analysis, the models with simple-gDE predict interesting and some significant deviations from the $\Lambda$CDM model. In particular, a spatially closed universe along with a simple-gDE of positive inertial mass density, which work in contrast to each other, results in minor improvement to the $H_0$ tension. The joint dataset, including the Planck data, presents no evidence for a deviation from spatial flatness but almost the same evidence for a cosmological constant and the simple-gDE with an inertial mass density of order $\mathcal{O}(10^{-12})\,\rm eV^4$. The latter case predicts almost no deviation from the $\Lambda$CDM model up until today--so that it results in no improvement regarding the BAO Ly-$\alpha$ data--except that it slightly aggravates the $H_0$ tension. We also study via dynamical analysis the history of the Universe in the models, as the simple-gDE results in futures different than the de Sitter future of the $\Lambda$CDM model. Comment: 17 pages, 9 figures, 2 tables; matches the version published in Physical Review D |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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