Relieving the Tension between Weak Lensing and Cosmic Microwave Background with Interacting Dark Matter and Dark Energy Models

TL;DR

This paper investigates whether interacting dark matter and dark energy models can resolve the tension between weak lensing data from KiDS and CMB measurements from Planck, finding that these models can alleviate the discordance.

Contribution

The study introduces and constrains IDMDE models using KiDS and Planck data, demonstrating their potential to reduce dataset tensions compared to the standard Lambda CDM model.

Findings

IDMDE models can alleviate the tension between KiDS and Planck datasets.

IDMDE models are moderately favored when combining both datasets.

The models provide a better fit to the combined data than Lambda CDM.

Abstract

We constrain interacting dark matter and dark energy (IDMDE) models using a 450-degree-square cosmic shear data from the Kilo Degree Survey (KiDS) and the angular power spectra from Planck's latest cosmic microwave background measurements. We revisit the discordance problem in the standard Lambda cold dark matter ($\Lambda$CDM) model between weak lensing and Planck datasets and extend the discussion by introducing interacting dark sectors. The IDMDE models are found to be able to alleviate the discordance between KiDS and Planck as previously inferred from the $\Lambda$CDM model, and moderately favored by a combination of the two datasets.