Constraining the interaction between dark sectors with future HI intensity mapping observations

TL;DR

This paper explores how future 21-cm intensity mapping surveys can effectively constrain interactions between dark matter and dark energy, which are difficult to detect with current methods.

Contribution

It provides forecasts for the detectability of dark sector interactions using upcoming radio surveys like BINGO, FAST, and SKA-I, highlighting their potential to tighten constraints.

Findings

Future radio surveys will significantly improve constraints on dark sector coupling.

HI intensity mapping is an effective tool for probing dark energy interactions.

Predictions show detectable signals within the sensitivity range of upcoming surveys.

Abstract

We study a model of interacting dark matter and dark energy, in which the two components are coupled. We calculate the predictions for the 21-cm intensity mapping power spectra, and forecast the detectability with future single-dish intensity mapping surveys (BINGO, FAST and SKA-I). Since dark energy is turned on at $z\sim 1$, which falls into the sensitivity range of these radio surveys, the HI intensity mapping technique is an efficient tool to constrain the interaction. By comparing with current constraints on dark sector interactions, we find that future radio surveys will produce tight and reliable constraints on the coupling parameters.