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R. A. Battye, B. Carter, E. Chachoua, and A. Moss, Rigidity and stability of cold dark solid universe model, Phys. Rev. D 72
2005
Cited alongside, same era.
F. Niedermann and M. S. Sloth, Resolving the Hubble tension with new early dark energy, Phys. Rev. D 102
Original
2006
Cited alongside, same era.
M. M. Ivanov, E. McDonough, J. C. Hill, M. Simonović, M. W. Toomey, S. Alexander, and M. Zaldarriaga, Constraining Early Dark Energy with Large-Scale Structure, Phys. Rev. D 102
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2006
Cited alongside, same era.
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Original
2006
Cited alongside, same era.
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Then

W. L. Freedman, Cosmology at a Crossroads, Nature Astron. 1
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2017
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S. M. Feeney, D. J. Mortlock, and N. Dalmasso, Clarifying the Hubble constant tension with a Bayesian hierarchical model of the local distance ladder, Mon. Not. Roy. Astron. Soc. 476
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2018
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J. Evslin, A. A. Sen, and Ruchika, Price of shifting the Hubble constant, Phys. Rev. D 97
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2018
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V. Poulin, T. L. Smith, D. Grin, T. Karwal, and M. Kamionkowski, Cosmological implications of ultralight axionlike fields, Phys. Rev. D 98
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2018
Later among the works it cites.
D. M. Scolnic et al. , The Complete Light-curve Sample of Spectroscopically Confirmed SNe Ia from Pan-STARRS1 and Cosmological Constraints from the Combined Pantheon Sample, Astrophys. J. 859

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2022

Microphysics of Early Dark Energy

Sabla, Vivian I., Caldwell, Robert R.

Understand

Early Dark Energy (EDE) relies on scalar field dynamics to resolve the Hubble tension, by boosting the pre-recombination length scales and thereby raising the CMB-inferred value of the Hubble constant into agreement with late universe probes.

However, the collateral effect of scalar field microphysics on the linear perturbation spectra appears to preclude a fully satisfactory solution.
$H_0$ is not raised without the inclusion of a late universe prior, and the "$S_8$-tension", a discrepancy between early- and late-universe measurements of the structure growth parameter, is exacerbated.
What if EDE is not a scalar field? Here, we investigate whether different microphysics, encoded in the constitutive relationships between pressure and energy density fluctuations, can relieve these tensions.