{
  "abstract": "We investigate the cosmological dynamics of gravitational particle creation in a spatially flat FLRW Universe comprising radiation, baryons, dark matter (DM), and a separately conserved dark-energy component. The DM sector is described as an effective open thermodynamic fluid incorporating intrinsic pressure and particle-creation-induced negative pressure. Introducing the compact variable $u=H_0/(H_0+H)$, we construct a four-dimensional autonomous system and systematically investigate its critical points, dynamical stability, and physical admissibility. The model is constrained using three observational combinations: PPS+BAO+OHD, Union3+BAO+OHD, and DES-DOV+BAO+OHD. The observationally preferred parameter regions exclude the nontrivial DM-dominated de Sitter-like branches from the physical phase space, while identifying a stable, physically admissible, dark-energy-dominated accelerating attractor. The reconstructed cosmological evolution consistently reproduces the radiation--matter--acceleration sequence, with a transition redshift $z_{\\rm tr}\\simeq0.71$--$0.73$. Posterior-level analysis reveals that approximately $92\\%$--$97\\%$ of the samples support this accelerating attractor. The asymptotic evolution approaches a quintessence-like power-law expansion with $H\\rightarrow0$, rather than a de Sitter state. These findings establish a connection between observational constraints, gravitational particle creation, and the global dynamical structure governing the distant cosmic future.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.18531",
  "author_total": 1,
  "authors": [
    {
      "name": "Anirban Chatterjee"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/9y6wfbwq53659.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.18531",
  "fulltext_url": null,
  "id": "9y6wfbwq53659",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.18531",
  "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",
      "gr-qc"
    ],
    [
      "openalex",
      "3103|Cosmology and Gravitation Theories"
    ]
  ],
  "openalex": "W7221833162",
  "pdf_url": "https://arxiv.org/pdf/2610.18531",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-13",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/9y6wfbwq53659.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:29:11Z",
      "native_id": "2610.18531",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.18531"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:gr-qc",
      "subfield": "gravitation"
    }
  ],
  "title": "Dynamical stability and observational constraints on a late-time dark-matter particle-creation model",
  "title_text": "Dynamical stability and observational constraints on a late-time dark-matter particle-creation model",
  "type": "preprint",
  "updated_at": "2026-10-30T12:29:11Z",
  "url": "https://research.draconitic.com/paper/9y6wfbwq53659",
  "venue": "arXiv",
  "versions": []
}