{
  "abstract": "Recent DESI baryon acoustic oscillation (BAO) analyses suggest a preference for an evolving dark energy equation of state (EoS) that crosses the phantom divide $w=-1$. Interactions between dark energy and dark matter can also produce an apparent phantom-divide crossing in the effective dark energy EoS. In this work, we investigate interacting dark energy (IDE) models with a constant EoS parameter $w$, using cosmic microwave background (CMB) observations from Planck, ACT, and SPT, DESI DR2 BAO measurements, and type Ia supernova data from PantheonPlus, DES-Dovekie, and DESY5. We consider four typical forms of the interaction term $Q$. Our results show that the IDE models with $Q\\proptoρ_{\\rm de}$ generally exhibit a stronger preference for nonzero dark-sector interactions. In particular, for the CMB+DESI+DES-Dovekie data, the IDE model with $Q=βH_0ρ_{\\rm de}$ yields $β=-2.52^{+0.80}_{-0.54}$ and $w=-1.510^{+0.170}_{-0.120}$, corresponding to deviations from $β=0$ and $w=-1$ at the $3.2σ$ and $3.0σ$ levels, respectively. Interestingly, the effective EoS of the IDE model with $Q=βH_0ρ_{\\rm de}$ exhibits a redshift evolution resembling that of the $w_0w_a$CDM model, crossing the phantom divide. Bayesian evidence further indicates that this IDE model is favored over $Λ$CDM and the other three IDE models. Our analysis helps identify which interaction forms better account for current cosmological observations.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.30784",
  "author_total": 7,
  "authors": [
    {
      "name": "Zhao-Yu Li"
    },
    {
      "name": "Tian-Nuo Li"
    },
    {
      "name": "Guo-Hong Du"
    },
    {
      "name": "Sheng-Han Zhou"
    },
    {
      "name": "Yun-He Li"
    },
    {
      "name": "Jing-Fei Zhang"
    },
    {
      "name": "Xin Zhang"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/bhgfpjzwnq9j0.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.30784",
  "fulltext_url": null,
  "id": "bhgfpjzwnq9j0",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.30784",
  "language": null,
  "licence": "CC-BY-NC-ND-4.0",
  "licence_label": "CC BY-NC-ND 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by-nc-nd/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "astro-ph.CO"
    ],
    [
      "arxiv",
      "gr-qc"
    ],
    [
      "arxiv",
      "hep-ph"
    ],
    [
      "openalex",
      "3103|Cosmology and Gravitation Theories"
    ]
  ],
  "openalex": "W7223336680",
  "pdf_url": "https://arxiv.org/pdf/2610.30784",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-22",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/bhgfpjzwnq9j0.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:34:34Z",
      "native_id": "2610.30784",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.30784"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.CO",
      "subfield": "cosmology"
    },
    {
      "field": "physics",
      "origin": "arxiv:gr-qc",
      "subfield": "gravitation"
    },
    {
      "field": "physics",
      "origin": "arxiv:hep-ph",
      "subfield": "high-energy"
    }
  ],
  "title": "Constraints on interacting dark energy with a constant equation of state in light of DESI DR2: The role of the interaction term",
  "title_text": "Constraints on interacting dark energy with a constant equation of state in light of DESI DR2: The role of the interaction term",
  "type": "preprint",
  "updated_at": "2026-10-30T12:34:34Z",
  "url": "https://research.draconitic.com/paper/bhgfpjzwnq9j0",
  "venue": "arXiv",
  "versions": []
}