Searching for Signatures of Dark matter-Dark Radiation Interaction in Observations of Large-scale Structure

Abstract

In this paper, we conduct a search in the latest large-scale structure measurements for signatures of the dark matter-dark radiation interaction proposed by Buen-Abad et al. (2015). We show that prior claims of a detection of this interaction rely on a use of the SZ cluster mass function that ignores uncertainty in the mass-observable relationship. Including this uncertainty we find that the inferred level of interaction remains consistent with the data, but so does zero interaction; i.e., there is no longer a detection. We also point out that inference of the shape and amplitude of the matter power spectrum from Ly$\alpha$ forest measurements is highly inconsistent with the predictions of the $\Lambda$CDM model conditioned on Planck CMB temperature, polarization, and lensing power spectra, and that the dark matter-dark radiation model can restore that consistency. We also phenomenologically generalize the model of Buen-Abad et al. (2015) to allow for interaction rates with different scalings with temperature, and find that the original scaling is preferred by the data.

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• Cannibal Dark Matter and Large Scale Structure
• Lyman-$\alpha$ forest constraints on interacting dark sectors
• Dark Matter Interactions, Helium, and the CMB
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• Astrophysical Tests of Dark Matter Self-Interactions
• The effect of dark matter-dark radiation interactions on halo abundance -- a Press-Schechter approach
• Addressing Astrophysical and Cosmological Problems With Secretly Asymmetric Dark Matter
• Closing up the cluster tension?
• Early-time thermalization of cosmic components? A hint for solving cosmic tensions
• Probing Dark Relativistic Species and Their Interactions with Dark Matter through CMB and 21cm surveys
• Probing interacting dark sector models with future weak lensing-informed galaxy cluster abundance constraints from SPT-3G and CMB-S4
• Equality scale-based and sound horizon-based analysis of the Hubble tension
• Common Origin of Warm Dark Matter and Dark Radiation
• Reconciling Cosmological Tensions with Inelastic Dark Matter and Dark Radiation in a $\mathbf{U}(1{)}_{\mathbf{D}}$ Framework