Update on Coupled Dark Energy and the $H_0$ tension

Understand

In this work we provide updated constraints on coupled dark energy (CDE) cosmology with Peebles-Ratra (PR) potential and constant coupling strength $\beta$.

• This modified gravity scenario introduces a fifth force between dark matter particles, mediated by a scalar field that plays the role of dark energy.
• The mass of the dark matter particles does not remain constant, but changes with time as a function of the scalar field.
• Here we focus on the phenomenological behavior of the model, and assess its ability to describe updated cosmological data sets that include the Planck 2018 cosmic microwave background (CMB) temperature, polarization and lensing, baryon acoustic oscillations, the Pantheon compilation of supernovae of Type Ia, data on $H(z)$ from cosmic chronometers, and redshift-space distortions.