{
  "abstract": "We study an interacting relativistic system of charged bosons at finite temperature and fixed isospin density within a thermodynamically consistent mean-field approach. The interaction is represented by repulsive phi-4 and phi-6 self-interactions, which generate a density-dependent effective mass of the bosonic quasiparticles. We formulate the thermodynamics in the Extended Canonical Ensemble, obtained from the grand canonical description by a Legendre transformation from the isospin chemical potential to the conserved isospin density. In the condensed phase the chemical potential is constrained by the Bose-condensation condition and is therefore determined self-consistently through the effective mass. We apply the formalism to a pion-like system at finite isospin and clarify the relation between the isospin chemical-potential conventions used for pion and quark degrees of freedom. Using the convention adopted in lattice-QCD calculations, we compare the pressure, isospin density, energy density, and trace anomaly with lattice results at T=120 MeV. With one constant fitted to the lattice pressure, each model reproduces the lattice isospin density, energy density, and trace anomaly. Both the phi-4 and phi-6 models reproduce the main features of the lattice data, with the phi-6 interaction providing the better description. The Extended Canonical Ensemble provides a convenient framework for treating interacting particle-antiparticle systems across the transition to the Bose-condensed phase.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2611.06697",
  "author_total": 4,
  "authors": [
    {
      "name": "D. Anchishkin"
    },
    {
      "name": "V. Gnatovskyy"
    },
    {
      "name": "D. Zhuravel"
    },
    {
      "name": "V. Karpenko"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/9x2z5n40zst1b.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2611.06697",
  "fulltext_url": null,
  "id": "9x2z5n40zst1b",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2611.06697",
  "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",
      "nucl-th"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2611.06697",
  "pmcid": null,
  "pmid": null,
  "published": "2026-11-04",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/9x2z5n40zst1b.ris",
  "sources": [
    {
      "first_seen": "2026-11-05T15:20:56Z",
      "native_id": "2611.06697",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2611.06697"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:nucl-th",
      "subfield": "nuclear"
    }
  ],
  "title": "Interacting Boson System at Finite Temperatures: The treatment of the lattice QCD results",
  "title_text": "Interacting Boson System at Finite Temperatures: The treatment of the lattice QCD results",
  "type": "preprint",
  "updated_at": "2026-11-09T00:20:20Z",
  "url": "https://research.draconitic.com/paper/9x2z5n40zst1b",
  "venue": "arXiv",
  "versions": []
}