{
  "abstract": "We present a multi-probe observational analysis of a clustering tachyonic Dirac-Born-Infeld~(DBI) dark energy model. Its noncanonical kinetic term gives a subluminal sound speed, so dark energy perturbations can grow on subhorizon scales. Working in a multifluid framework that tracks both the background expansion and linear perturbations, we constrain the model with nested sampling, using Planck 2018 compressed CMB distance priors, DESI DR2 BAO, cosmic chronometers, $fσ_8$ growth data, and three Type Ia supernova compilations: Pantheon$+$, DES-SN5YR, and Union3. The standard cosmological parameters agree with $Λ$CDM within $2σ$, with DBI preferring a slightly lower $H_0$ and higher $Ω_{m0}$, with the largest shift being $\\simeq1.8σ$ in $H_0$ for Pantheon$+$. The Bayesian evidence favours DBI in every compilation, moderately for Pantheon$+$ ($Δ\\ln\\mathcal{Z}\\simeq3.4$) and inconclusively for DES-SN5YR and Union3 ($Δ\\ln\\mathcal{Z}\\simeq0.6$-$0.7$). The field thaws naturally. Dark energy perturbations stay several orders of magnitude below matter perturbations, yet the noncanonical sound speed still alters the Hubble friction term, raising $S_8$ by only $\\approx0.5σ$ relative to $Λ$CDM. Four independent diagnostics, namely the CPL parametrization, $Om(z)$, the statefinder hierarchy, and the growth index, all point to genuinely evolving dark energy rather than a cosmological constant. The thermal history is left intact, with negligible early dark energy. However, one limitation remains. Because $w_ϕ=\\dotϕ^2-1\\geq-1$, the phantom regime is out of reach, which is in line with the no-go theorem for a single minimally coupled scalar field, so the model cannot follow the DESI DR2 preference for an effective equation of state crossing $w=-1$.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2611.08008",
  "author_total": 6,
  "authors": [
    {
      "name": "Samit Ganguly"
    },
    {
      "name": "Surhud More"
    },
    {
      "name": "Goutam Manna"
    },
    {
      "name": "Kazuharu Bamba"
    },
    {
      "name": "Eduardo Guendelman"
    },
    {
      "name": "Abhijit Bhattacharyya"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/5w0n9hvz49ad6.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2611.08008",
  "fulltext_url": null,
  "id": "5w0n9hvz49ad6",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2611.08008",
  "language": null,
  "licence": "CC-BY-SA-4.0",
  "licence_label": "CC BY-SA 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by-sa/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "astro-ph.CO"
    ],
    [
      "arxiv",
      "gr-qc"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2611.08008",
  "pmcid": null,
  "pmid": null,
  "published": "2026-11-05",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/5w0n9hvz49ad6.ris",
  "sources": [
    {
      "first_seen": "2026-11-06T18:21:30Z",
      "native_id": "2611.08008",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2611.08008"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.CO",
      "subfield": "cosmology"
    },
    {
      "field": "physics",
      "origin": "arxiv:gr-qc",
      "subfield": "gravitation"
    }
  ],
  "title": "Multi-Probe Cosmological Constraints on Clustering DBI Dark Energy Scenario",
  "title_text": "Multi-Probe Cosmological Constraints on Clustering DBI Dark Energy Scenario",
  "type": "preprint",
  "updated_at": "2026-11-09T00:20:41Z",
  "url": "https://research.draconitic.com/paper/5w0n9hvz49ad6",
  "venue": "arXiv",
  "versions": []
}