Kavli Affiliate: George Efstathiou
| First 5 Authors: George Efstathiou, Erik Rosenberg, Vivian Poulin, ,
| Summary:
Axion-like early dark energy (EDE) as an extension to $Lambda$CDM 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 $f_{rm EDE} < 0.061$ (without SH0ES) over the redshift range
$zin[10^3,10^4]$ and that the Hubble constant is constrained to lie within the
range $ 66.9 < H_0 < 69.5$ km/s/Mpc (both at 95 % C.L.). The data therefore
favour a model close to $Lambda$CDM, leaving a residual tension of $3.7sigma$
with the SH$0$ES Cepheid-based measurement of $H_0$. 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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