{
  "abstract": "We investigate the linear perturbation cosmology of a spinor-field realization of quintessence dark energy by implementing the model in the Einstein--Boltzmann solver \\texttt{CLASS}. The model parameters are constrained using a Markov Chain Monte Carlo analysis with Pantheon$^{+}$ Type Ia supernovae, cosmic chronometers, DESI DR2 baryon acoustic oscillations, redshift-space distortions, and Planck 2018 CMB distance-prior data. For the full combined dataset, we obtain $w_{\\rm de}=-0.9710^{+0.0206}_{-0.0206}$, $Ω_{m0}=0.2939^{+0.0047}_{-0.0047}$, and $H_0=66.23^{+0.55}_{-0.53},\\mathrm{kms^{-1}Mpc^{-1}}$. The corresponding perturbation quantities are $σ_8=0.7537^{+0.0076}_{-0.0075}$ and $S_8=0.7459^{+0.0067}_{-0.0065}$. We find that the spinor-quintessence model closely reproduces the predictions of a phenomenological constant-$w$ model in the matter power spectrum, growth-rate observable $fσ_8$, growth index, and CMB temperature anisotropy spectrum, with deviations generally below the percent level. A comparison with $Λ$CDM and $w$CDM shows statistically indistinguishable fits, although the Bayesian information criterion favors the simpler $Λ$CDM model. Our results demonstrate that the spinor-field quintessence scenario remains consistent with current expansion-history and structure-growth observations when its perturbation evolution is treated consistently, providing a field-theoretically motivated realization of constant-$w$ dark energy at the background and linear perturbation levels.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.00041",
  "author_total": 1,
  "authors": [
    {
      "name": "Mahendra Goray"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/4zt4ztz1df5mb.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.00041",
  "fulltext_url": null,
  "id": "4zt4ztz1df5mb",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.00041",
  "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",
      "physics.gen-ph"
    ],
    [
      "openalex",
      "3103|Cosmology and Gravitation Theories"
    ]
  ],
  "openalex": "W7206179524",
  "pdf_url": "https://arxiv.org/pdf/2609.00041",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-01",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/4zt4ztz1df5mb.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:18:00Z",
      "native_id": "2609.00041",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.00041"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "openalex:3103|Cosmology and Gravitation Theories",
      "subfield": "cosmology"
    }
  ],
  "title": "Cosmological Perturbations and Observational Constraints on Spinor Field Quintessence Dark Energy",
  "title_text": "Cosmological Perturbations and Observational Constraints on Spinor Field Quintessence Dark Energy",
  "type": "preprint",
  "updated_at": "2026-10-30T12:18:00Z",
  "url": "https://research.draconitic.com/paper/4zt4ztz1df5mb",
  "venue": "arXiv",
  "versions": []
}