Probing Dark Relativistic Species and Their Interactions with Dark Matter through CMB and 21cm surveys

TL;DR

This paper explores how 21cm surveys, combined with CMB data, can significantly improve constraints on dark radiation and dark matter interactions, potentially addressing cosmological tensions.

Contribution

It demonstrates that 21cm observations can vastly enhance sensitivity to dark sector interactions beyond current CMB constraints.

Findings

21cm data improves sensitivity to DM-DR interaction rate by up to four orders of magnitude.

HERA observations can probe DM-DR interactions relevant to the $S_8$ tension.

Combined 21cm and CMB data provide complementary constraints on dark sector physics.

Abstract

We investigate the sensitivity of the 21cm power spectrum from cosmic dawn and the epoch of reionization to models of free-streaming dark radiation (parameterized through $N_{\rm eff}$) and interacting dark radiation-dark matter models (DM-DR). The latter models have gained attention for their potential in addressing recent cosmological tensions and structure formation challenges. We perform a Fisher matrix analysis under different assumptions regarding the astrophysical modeling, and forecast the sensitivity of HERA observations, combined with CMB data from Planck and the Simons Observatory (SO), to $N_{\rm eff}$ and DM-DR interaction modeled using the ETHOS framework assuming a constant scattering rate between the two components. Most importantly, we find that 21cm observations can improve the sensitivity to the DM-DR interaction rate by up to four order of magnitude compared to Planck and SO. Conversely, in the limit of low interaction rate (which asymptotically matches $N_{\rm eff}$), CMB data dominates the constraining power, but the inclusion of HERA data can provide a $\sim 20\%$ improvement in sensitivity over CMB data alone. Moreover, we find that HERA observations will be able to probe a region of the DM-DR interaction parameter space which is promising to explain the weak lensing amplitude `$S_8$' tension. Our results demonstrate the complementarity of 21cm and CMB data in exploring dark sector interactions.