Cosmic microwave background constraints on extended dark matter objects

Abstract

Primordially formed extended dark objects would accrete baryonic matter and impact the ionisation history of the Universe. Insisting on consistency with the anisotropies of the cosmic microwave background, we derive constraints on the dark matter fraction for various classes of objects, of different sizes. We introduce a novel scaling technique to speed up numerical calculations and release our calculation framework in the form of a Mathematica notebook. Conservatively, we focus on spherical accretion and collisional ionisation. We find strong constraints limiting the dark matter fraction to subpercent level for objects of up to $10^4$ AU in size.

23 pages, 8 figures, Code available at:https://gitlab.com/SergioSevillano/edo-accretion

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• Constraints on Dark Matter from Dynamical Heating of Stars in Ultrafaint Dwarfs. Part 2: Substructure and the Primordial Power Spectrum
• Signatures of dark and baryonic structures on weakly lensed gravitational waves
• Axion star condensation around primordial black holes and microlensing limits
• Probing Long-Range Forces Between Neutrinos with Cosmic Structures
• Updated constraints on the primordial power spectrum at sub-Mpc scales
• Across the Universe: GW231123 as a magnified and diffracted black hole merger