{
  "abstract": "A double-occupancy cell model of a fluid with Curie-Weiss interaction is studied. First, we show that the model is isomorphic to the Blume-Capel model on a complete graph through a simple transformation from spin to occupancy variables. We then investigate its phase behavior within the grand-canonical ensemble using a combination of analytical and numerical methods. Despite its simplicity, the model exhibits a remarkably rich thermodynamic behavior depending on the ratio between the local repulsive and global attractive interactions. We identify the regimes characterized by a single critical point, two distinct critical points, tricritical behavior, and triple-point formation. For sufficiently strong repulsion, the system possesses three fluid phases of different densities, leading to both gas-liquid and liquid-liquid coexistence. The locations of the critical, tricritical, and triple points are determined, and the corresponding phase diagrams are constructed. These results demonstrate that the competition between double-occupancy repulsion and long-range attraction is sufficient to generate a complex phase behavior in a minimal multiple-occupancy lattice-gas-like model.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": "Journal reference: Condens. Matter Phys. 2026, 29 (3), 33603",
  "arxiv": "2607.01009",
  "author_total": 5,
  "authors": [
    {
      "name": "R. V. Romanik"
    },
    {
      "name": "O. A. Dobush"
    },
    {
      "name": "M. P. Kozlovskii"
    },
    {
      "name": "I. V. Pylyuk"
    },
    {
      "name": "M. A. Shpot"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/9qe6bkycp4e5d.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2607.01009",
  "fulltext_url": null,
  "id": "9qe6bkycp4e5d",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2607.01009",
  "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",
      "cond-mat.soft"
    ],
    [
      "arxiv",
      "cond-mat.stat-mech"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2607.01009",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-29",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/9qe6bkycp4e5d.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:25:31Z",
      "native_id": "2607.01009",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2607.01009"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.soft",
      "subfield": "condensed-matter"
    },
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.stat-mech",
      "subfield": "statistical-nonlinear"
    }
  ],
  "title": "Phase diagram of a double-occupancy cell model of a fluid with Curie-Weiss interaction",
  "title_text": "Phase diagram of a double-occupancy cell model of a fluid with Curie-Weiss interaction",
  "type": "preprint",
  "updated_at": "2026-10-30T12:25:31Z",
  "url": "https://research.draconitic.com/paper/9qe6bkycp4e5d",
  "venue": "arXiv",
  "versions": [
    {
      "doi": "10.5488/cmp.29.33603",
      "pid": null,
      "relation": "published-as",
      "title": null,
      "venue": null
    }
  ]
}