Relieving the tension with a new interacting dark energy model
arXiv:2101.10714 · doi:10.1088/1475-7516/2021/07/005
Abstract
We investigate an extended cosmological model motivated by the asymptotic safety of gravitational field theory, in which the matter and radiation densities and the cosmological constant receive a correction parametrized by the parameters and , leading to that both the evolutions of the matter and radiation densities and the cosmological constant slightly deviate from the standard forms. Here we explain this model as a scenario of vacuum energy interacting with matter and radiation. We consider two cases of the model: {(i) CDM with one additional free parameter , with and related by a low-redshift limit relation and (ii) eCDM with two additional free parameters and that are independent of each other.} We use two data combinations, CMB+BAO+SN (CBS) and CMB+BAO+SN+ (CBSH), to constrain the models. We find that, in the case of using the CBS data, neither CDM nor eCDM can effectively alleviate the tension. However, it is found that using the CBSH data the tension can be greatly relieved by the models. In particular, in the case of eCDM, the tension can be resolved to 0.71. We conclude that as an interacting dark energy model, CDM is much better than CDM in the sense of both relieving the tension and fitting to the current observational data.
arXiv comment17 pages, 6 figures; accepted for publication in JCAP
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