{
  "abstract": "Using the effective field theory of cosmological media, we show that derivative interactions in the dark sector between a perfect fluid and a superfluid cannot support slow-roll expansion while remaining free from instabilities. Furthermore, decomposing the dark sector medium into effective dark matter and dark energy components, we find that the stability conditions exclude a phantom-to-non-phantom crossing. Our approach gives a clear route for constructing theoretically viable dark sector models, and highlights the fundamental constraints that stability requirements impose on their cosmological dynamics.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2611.05560",
  "author_total": 4,
  "authors": [
    {
      "name": "Jose Beltrán Jiménez"
    },
    {
      "name": "Luis J. Garay"
    },
    {
      "name": "Erik Jensko"
    },
    {
      "name": "María Pérez Garrote"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/fcaerqsjjedps.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2611.05560",
  "fulltext_url": null,
  "id": "fcaerqsjjedps",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2611.05560",
  "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"
    ],
    [
      "arxiv",
      "gr-qc"
    ],
    [
      "arxiv",
      "hep-th"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2611.05560",
  "pmcid": null,
  "pmid": null,
  "published": "2026-11-03",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/fcaerqsjjedps.ris",
  "sources": [
    {
      "first_seen": "2026-11-05T15:20:56Z",
      "native_id": "2611.05560",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2611.05560"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.CO",
      "subfield": "cosmology"
    },
    {
      "field": "physics",
      "origin": "arxiv:gr-qc",
      "subfield": "gravitation"
    },
    {
      "field": "physics",
      "origin": "arxiv:hep-th",
      "subfield": "high-energy"
    }
  ],
  "title": "An obstruction to cosmic acceleration from shift-symmetric dark sector interactions",
  "title_text": "An obstruction to cosmic acceleration from shift-symmetric dark sector interactions",
  "type": "preprint",
  "updated_at": "2026-11-05T15:20:56Z",
  "url": "https://research.draconitic.com/paper/fcaerqsjjedps",
  "venue": "arXiv",
  "versions": []
}