A Consistent View of Interacting Dark Energy from Multiple CMB Probes

TL;DR

This study examines a cosmological model with interacting dark energy and dark matter using multiple CMB datasets, consistently finding a preference for interaction and an $H_0$ value aligned with local measurements.

Contribution

It provides a comprehensive analysis of interacting dark energy models using diverse CMB data, confirming the interaction preference across datasets and probes.

Findings

Consistent preference for interacting dark energy across datasets.

Interaction favored at 95% confidence level.

$H_0$ values align with local distance ladder measurements.

Abstract

We analyze a cosmological model featuring an interaction between dark energy and dark matter in light of the measurements of the Cosmic Microwave Background released by three independent experiments: the most recent data by the Planck satellite and the Atacama Cosmology Telescope, and WMAP (9-year data). We show that different combinations of the datasets provide similar results, always favoring an interacting dark sector with a $95\%$~CL significance in the majority of the cases. Remarkably, such a preference remains consistent when cross-checked through independent probes, while always yielding a value of the expansion rate $H_0$ consistent with the local distance ladder measurements. We investigate the source of this preference by scrutinizing the angular power spectra of temperature and polarization anisotropies as measured by different experiments.