Smoothing the tension with a dynamical dark energy model
arXiv:2301.04200 · doi:10.1016/j.dark.2023.101266
Abstract
The discrepancy between Planck data and direct measurements of the current expansion rate and the matter fluctuation amplitude has become one of the most intriguing puzzles in cosmology nowadays. The tension has reached in the context of standard cosmology i.e CDM. Therefore, explanations to this issue are mandatory to unveil its secrets. Despite its success, CDM is unable to give a satisfying explanation to the tension problem. Unless some systematic errors might be hidden in the observable measurements, physics beyond the standard model of cosmology must be advocated. In this perspective, we study a phantom dynamical dark energy model as an alternative to CDM in order to explain the aforementioned issues. This phantom model is characterised by one extra parameter, , compared to CDM. We obtain a strong positive correlation between and , for all data combinations. Using Planck measurements together with BAO and Pantheon, we find that the and the tensions are and , respectively. By introducing a prior on the absolute magnitude, , of the SN Ia, the tension decreases to with km s Mpc and the tension reaches the value with .
arXiv comment11 pages, 4 figures
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