Reconciling early dark energy with a Harrison-Zeldovich spectrum

Abstract

Recent attempts to fully resolve the Hubble tension from early dark energy models seem to favor a primordial Harrison-Zeldovich universe with its scalar spectrum being extremely scale invariant. Restoring the Harrison-Zeldovich spectrum within the single-field inflationary paradigm appears to be infeasible, turning to the multifield approach from either curvaton or waterfall models. In this Letter, we successfully align with the Harrison-Zeldovich spectrum within a single-field chaotic inflation by a nonminimal derivative coupling, and the previously disfavored chaotic potential by Planck+BICEP/Keck data in the standard $\Lambda$-cold-dark-matter model now returns back to the scope of future polarization observations of the cosmic microwave background.

v1, 7 pages, 3 figures; v2, references added; v3, title changed as required by the Editor, version accepted for publication in Phys. Rev. D as a Letter; v4, to match the published version

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• Resilience and implications of adiabatic CMB cooling
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• 2D BAO vs 3D BAO: Hints for new physics?
• Harrison-Zeldovich attractor: From Planck to ACT results