{
  "abstract": "We investigate whether interacting dark energy can provide additional relief to the Hubble tension once early dark energy (EDE) is present. Considering a cosmology containing EDE, an independent late-time dark energy fluid with an equation of state fixed at $w\\simeq-1$ interacting with cold dark matter, and a cosmological constant, we find that the data strongly drive the model toward the non-interacting limit. The best fit effectively reduces to the standard EDE cosmology, where a non-zero EDE component provides most of the required increase in $H_0$, leaving little statistical gain for the interaction. Although energy transfer from dark matter to dark energy can raise $H_0$ further, this limited gain is rapidly outweighed by the deterioration of the fit to low-redshift observations. In particular, since the CMB tightly constrains the early-time physical matter density, any additional energy transfer requires a lower present-day matter abundance. Such low values are strongly disfavored by Type Ia supernovae. We show that this limitation becomes particularly severe once EDE has already raised $H_0$ and that the same mechanism extends to a broad class of post-recombination interactions. Allowing a dynamical dark energy equation of state of the Chevallier-Polarski-Linder form does not alter our conclusions.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.37836",
  "author_total": 2,
  "authors": [
    {
      "name": "William Giarè"
    },
    {
      "name": "Jeremy Sakstein"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/6ta4rckpgpwy7.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.37836",
  "fulltext_url": null,
  "id": "6ta4rckpgpwy7",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.37836",
  "language": null,
  "licence": "LicenseRef-arXiv-nonexclusive-1.0",
  "licence_label": "arXiv licence",
  "licence_source": "article",
  "licence_url": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "astro-ph.CO"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2610.37836",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-27",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/6ta4rckpgpwy7.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:36:23Z",
      "native_id": "2610.37836",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.37836"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.CO",
      "subfield": "cosmology"
    }
  ],
  "title": "Early Dark Energy Crowds Out Interacting Dark Energy",
  "title_text": "Early Dark Energy Crowds Out Interacting Dark Energy",
  "type": "preprint",
  "updated_at": "2026-11-01T12:20:44Z",
  "url": "https://research.draconitic.com/paper/6ta4rckpgpwy7",
  "venue": "arXiv",
  "versions": []
}