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Improved Planck constraints on axion-like early dark energy as a resolution of the Hubble tension
George Efstathiou, Erik Rosenberg, Vivian Poulin
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Axion-like early dark energy (EDE) as an extension to ΛCDM has been proposed as a possible solution to the 'Hubble tension'. We revisit this model using a new cosmic microwave background (CMB) temperature and polarization likelihood constructed from the {\it Planck} NPIPE data release. In a Bayesian analysis, we find that the maximum fractional contribution of EDE to the total energy density is f_(EDE) < 0.061 (without SH0ES) over the redshift range z∈[10³,10⁴] and that the Hubble constant is constrained to lie within the range 66.9 < H₀ < 69.5 km/s/Mpc (both at 95 \% C.L.). The data therefore favour a model close to ΛCDM, leaving a residual tension of 3.7σ with the SH$0$ES Cepheid-based measurement of H₀. A comparison with the likelihood profile shows that our conclusions are robust to prior-volume effects. Our new CMB likelihood provides no evidence in favour of a significant EDE component.
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