Can the Universe decelerate in the future?
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arXiv
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| Main Authors: | , , , |
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| Format: | Preprint |
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2023
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| _version_ | 1866913210478624768 |
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| author | Escobal, A. A. Jesus, J. F. Pereira, S. H. Lima, J. A. S. |
| author_facet | Escobal, A. A. Jesus, J. F. Pereira, S. H. Lima, J. A. S. |
| contents | The possibility of an expanding decelerating Universe in the distant future is investigated in the context of a quintessence scalar field cosmology. Such a conceivable evolution is tested against SNe Ia and $H(z)$ cosmic chronometers data, and also through a model independent method based on Gaussian Processes. The scalar field model is an extension of the exponential Ratra-Peebles (RP) quintessential cosmology whose potential now depends on a pair of parameters ($α, λ)$ and predicts a decelerated expansion in the future. Different from RP approach the $α$ parameter allows for a decelerating cosmology in the future thereby frustrating the inevitable evolution for a de Sitter Cosmology as predicted by the cosmic concordance model ($Λ$CDM). The statistical model analysis is updated with the most recent SNe Ia and $H(z)$ data thereby obtaining $H_0 = 68.6\pm3.7$ km/s/Mpc, $Ω_{\Phi0} = 0.735^{+0.083}_{-0.069} $, $α< 6.56$ and $λ< 0.879 $ (at $2σ$ c.l.). It is also found that the extended RP model allows for a future deceleration both for $H(z)$ and SNe Ia data. In the (model-independent) Gaussian Processes analysis, however, future deceleration is allowed only in the case of $H(z)$ data. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2302_01946 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Can the Universe decelerate in the future? Escobal, A. A. Jesus, J. F. Pereira, S. H. Lima, J. A. S. Cosmology and Nongalactic Astrophysics The possibility of an expanding decelerating Universe in the distant future is investigated in the context of a quintessence scalar field cosmology. Such a conceivable evolution is tested against SNe Ia and $H(z)$ cosmic chronometers data, and also through a model independent method based on Gaussian Processes. The scalar field model is an extension of the exponential Ratra-Peebles (RP) quintessential cosmology whose potential now depends on a pair of parameters ($α, λ)$ and predicts a decelerated expansion in the future. Different from RP approach the $α$ parameter allows for a decelerating cosmology in the future thereby frustrating the inevitable evolution for a de Sitter Cosmology as predicted by the cosmic concordance model ($Λ$CDM). The statistical model analysis is updated with the most recent SNe Ia and $H(z)$ data thereby obtaining $H_0 = 68.6\pm3.7$ km/s/Mpc, $Ω_{\Phi0} = 0.735^{+0.083}_{-0.069} $, $α< 6.56$ and $λ< 0.879 $ (at $2σ$ c.l.). It is also found that the extended RP model allows for a future deceleration both for $H(z)$ and SNe Ia data. In the (model-independent) Gaussian Processes analysis, however, future deceleration is allowed only in the case of $H(z)$ data. |
| title | Can the Universe decelerate in the future? |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2302.01946 |