Relieving the H0 tension with a new interacting dark energy model. Issue 7 (5th July 2021)

• Record Type: Journal Article
• Authors: Gao, Li-Yang; Zhao, Ze-Wei; Xue, She-Sheng; Zhang, Xin
• Is Part Of: Journal of cosmology and astroparticle physics. Volume 2021:Issue 7(2021)
• Publication Date: 2021-07-05
• Subjects: dark energy experiments -- dark energy theory; Cosmology -- Periodicals; Astrophysics -- Periodicals; 523.0105
• DOI: 10.1088/1475-7516/2021/07/005
• Languages: English
• ISSNs: 1475-7516

Abstract

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 δ G and δ Λ, 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) Λ̃CDM with one additional free parameter δ G, with δ G and δ Λ related by a low-redshift limit relation and (ii) eΛ̃CDM with two additional free parameters δ G and δ Λ that are independent of each other. We use two data combinations, CMB+BAO+SN (CBS) and CMB+BAO+SN+ H 0 (CBSH), to constrain the models. We find that, in the case of using the CBS data, neither Λ̃CDM nor eΛ̃CDM can effectively alleviate the H 0 tension. However, it is found that using the CBSH data the H 0 tension can be greatly relieved by the models. In particular, in the case of eΛ̃CDM, the H 0 tension can be resolved to 0.71σ. We conclude that as an interacting dark energy model, Λ̃CDM is much better than Λ(t)CDM in the sense of both relieving the H 0 tension and fitting to the current observational data.