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We investigate constraints on early dark energy (EDE) using ACT DR4, SPT-3G 2018, Planck polarization, and restricted Planck temperature data (at 1300 reduces the preference from 3. 0 to 2. 3 and the constraint on f₄₃₄ (z₂) becomes compatible with at 1. We explore whether systematic errors in the Planck polarization data may affect our conclusions and find that changing the TE polarization efficiencies significantly reduces the Planck preference for EDE. More work will be necessary to establish whether these hints for EDE within CMB data alone are the sole results of systematic errors or an opening to new physics.
Smith et al. (Wed,) studied this question.