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N. Kaloper, Dark energy, H 0 H_{0} and weak gravity conjecture
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1903
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F. Takahashi and W. Yin, ALP inflation and Big Bang on Earth
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1903
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P. Agrawal, F.-Y. Cyr-Racine, D. Pinner, and L. Randall, Rock ’n’ Roll Solutions to the Hubble Tension
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1904
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M.-X. Lin, G. Benevento, W. Hu, and M. Raveri, Acoustic Dark Energy: Potential Conversion of the Hubble Tension
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1905
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1907
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1911
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2003
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2003
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2004
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2004
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2005
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M. Benetti, L. L. Graef, and J. S. Alcaniz, Do joint CMB and HST data support a scale invariant spectrum?
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2017
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2022

Towards early dark energy and $n_s$=1 with Planck, ACT and SPT

Jiang, Jun-Qian, Piao, Yun-Song

Understand

We investigate the constraints on early dark energy (EDE) by combining the most recent CMB observations available, ACT DR4, SPT-3G, and Planck2018 ($\ell_\text{TT,max}=1000$) data.

This combined CMB dataset favors non-zero EDE fractions and large Hubble constants.
The inclusion of BAO+Pantheon data has little effect on the results, leads to $H_0=71.6( 72.9)_{-1.5}^{+2.0}$ and $73.17(72.74)^{+0.55}_{-0.77}$ km/s/Mpc for axion-like EDE and AdS-EDE, respectively.
The axion-like EDE can fit the data significantly better ($\Delta \chi^2 \lesssim -10$) than $\Lambda$CDM, which is mainly driven by the ACT data.