Constraining interacting dark energy models with latest cosmological observations

TL;DR

Addresses whether late-time strengthening of dark energy via dark-energy–dark-matter interaction can relieve the H0 tension. Uses a joint analysis of Planck distance priors, BAO, LSS AP, SNe, H(z), and local H0 to constrain IDE models with a coupling parameter gamma. Finds gamma consistent with zero; a wCDM extension yields a mild deviation w<-1 and slight alleviation of the H0 tension, but IDE is not favored by the data. Concludes that current observations place tight limits on IDE and prefer LambdaCDM for late-time cosmology.

Abstract

The local measurement of $H_0$ is in tension with the prediction of $Λ$CDM model based on the Planck data. This tension may imply that dark energy is strengthened in the late-time Universe. We employ the latest cosmological observations on CMB, BAO, LSS, SNe, $H(z)$ and $H_0$ to constrain several interacting dark energy models. Our results show no significant indications for the interaction between dark energy and dark matter. The $H_0$ tension can be moderately alleviated, but not totally released.

Figures (2)

• Figure 1: The marginalized distribution contour of $H_0$ and $w$ for the wCDM model.
• Figure 2: The marginalized distribution contours and the likelihood distributions of $w$, $\gamma$ and $H_0$ for the IwCDM models.