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 -cold-dark-matter model now returns back to the scope of future polarization observations of the cosmic microwave background.
Keywords
Cite
@article{arxiv.2310.12932,
title = {Reconciling early dark energy with a Harrison-Zeldovich spectrum},
author = {Chengjie Fu and Shao-Jiang Wang},
journal= {arXiv preprint arXiv:2310.12932},
year = {2024}
}
Comments
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