PBH evaporation at ΩPBH≈1e-3 ΩC delays recombination (Δz≈64) and boosts CMB-inferred H0 by ~9%, enough to nominally resolve the Hubble tension, though full CMB fits require lower densities.
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The impact of Hawking radiation from primordial black holes on recombination and the Hubble tension
PBH evaporation at ΩPBH≈1e-3 ΩC delays recombination (Δz≈64) and boosts CMB-inferred H0 by ~9%, enough to nominally resolve the Hubble tension, though full CMB fits require lower densities.