{
  "abstract": "We forecast constraints on the parameters of the coupled dark energy model using DESI and Euclid data with the one-loop galaxy power spectrum. We investigate the distinguishability of our model from the zero-coupling scenario at the $1σ$ level and explore how the parameter constraints depend on the fiducial coupling $β_{\\rm fid}$, the fixed potential slope parameter $ν$, the maximum wavenumber $k_{\\max}$, and different prior choices. We find that the inclusion of mildly non-linear scales improves the constraints on the coupling by roughly a factor of five. Then, we address the question of which is the minimum value of $β$ that can be distinguished from zero at $1σ$. We find that for our reference case $k_{\\rm max}=0.2 h/$Mpc, $β=0.15$ lies roughly $1σ$ above zero. In the most optimistic case with $k_{\\rm max}=0.3 h/$Mpc and including a Planck prior on $Ω_{m0}$, this value can be reduced to $0.05$. These values are substantially larger than the current constraints on $β$, but the latter have been obtained assuming $β$ to be constant from at least the decoupling epoch to today, while we only employ late-time data. We conclude therefore that only models that allow for time-varying couplings can be detected with late-time datasets.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.14966",
  "author_total": 2,
  "authors": [
    {
      "name": "Bilal Tüdes"
    },
    {
      "name": "Luca Amendola"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/56epb3bf2e31p.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.14966",
  "fulltext_url": null,
  "id": "56epb3bf2e31p",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.14966",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "astro-ph.CO"
    ],
    [
      "openalex",
      "3103|Cosmology and Gravitation Theories"
    ]
  ],
  "openalex": "W7213356723",
  "pdf_url": "https://arxiv.org/pdf/2609.14966",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-29",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/56epb3bf2e31p.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:25:48Z",
      "native_id": "2609.14966",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.14966"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.CO",
      "subfield": "cosmology"
    }
  ],
  "title": "Forecasting Coupled Dark Energy Parameters with the One-Loop Galaxy Power Spectrum",
  "title_text": "Forecasting Coupled Dark Energy Parameters with the One-Loop Galaxy Power Spectrum",
  "type": "preprint",
  "updated_at": "2026-10-30T12:25:48Z",
  "url": "https://research.draconitic.com/paper/56epb3bf2e31p",
  "venue": "arXiv",
  "versions": []
}