Can the Universe decelerate in the future?
Abstract
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 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 ( and predicts a decelerated expansion in the future. Different from RP approach the 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 (CDM). The statistical model analysis is updated with the most recent SNe Ia and data thereby obtaining km/s/Mpc, , and (at c.l.). It is also found that the extended RP model allows for a future deceleration both for and SNe Ia data. In the (model-independent) Gaussian Processes analysis, however, future deceleration is allowed only in the case of data.
Keywords
Cite
@article{arxiv.2302.01946,
title = {Can the Universe decelerate in the future?},
author = {A. A. Escobal and J. F. Jesus and S. H. Pereira and J. A. S. Lima},
journal= {arXiv preprint arXiv:2302.01946},
year = {2024}
}
Comments
10 pages, 5 figures. Accepted for publication in Physical Review D