Constraining constant and tomographic coupled dark energy with low-redshift and high-redshift probes

Understand

We consider coupled dark energy (CDE) cosmologies, where dark matter particles feel a force stronger than gravity, due to the fifth force mediated by a scalar field which plays the role of dark energy.

• We perform for the first time a tomographic analysis of coupled dark energy, where the coupling strength is parametrized and constrained in different redshift bins.
• This allows us to verify which data can better constrain the strength of the coupling and how large the coupling can be at different epochs.
• First, we employ cosmic microwave background data from Planck, the Atacama Cosmology Telescope (ACT) and South Pole Telescope (SPT), showing the impact of different choices that can be done in combining these datasets.