Relieving the H₀tension with a new interacting dark energy model

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.

Dissecting the $H_0$ and $S_8$ tensions with Planck + BAO + supernova type Ia in multi-parameter cosmologies

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A forecast of using fast radio burst observations to constrain holographic dark energy

“…On the other hand, for the measurements of the Hubble constant, in recent years there appeared the puzzle of "Hubble tension". The values of the Hubble constant derived from different observations show strong tension, which actually reflects the inconsistency of measurements between the early universe and the late universe [111][112][113][114][115][116][117][118][119][120][121]. One may expect to precisely measure Ω b h 2 and H 0 with powerful low-redshift probes.…”

Galaxy-Scale Test of General Relativity with Strong Gravitational Lensing

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