{
  "abstract": "A framework for quantum electrodynamics of equilibrium systems is proposed that takes the Maxwell equations as foundational and links them to the structure of density-functional theory for the quantum system. By switching from purely internal observables like the one-particle density to combined internal and external quantities, the external sources and their energy are taken into account. A fully regularized functional theory emerges that avoids the usual representability problems. With the Kohn-Sham construction that links to an auxiliary uncoupled system, the ultra-violet cutoff can be removed and one arrives at a fully renormalized and non-perturbative light-matter description. Regularized forms of density-functional theory with and without magnetic fields appear as boundary cases, while the emergent physical picture reproduces the macroscopic Maxwell equations.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.18327",
  "author_total": 4,
  "authors": [
    {
      "name": "Markus Penz"
    },
    {
      "name": "Christian Jöns"
    },
    {
      "name": "Michael Ruggenthaler"
    },
    {
      "name": "Angel Rubio"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/09zxmf4q0d46z.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.18327",
  "fulltext_url": null,
  "id": "09zxmf4q0d46z",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.18327",
  "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.mtrl-sci"
    ],
    [
      "arxiv",
      "physics.chem-ph"
    ],
    [
      "arxiv",
      "quant-ph"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2609.18327",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-16",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/09zxmf4q0d46z.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:22:01Z",
      "native_id": "2609.18327",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.18327"
    }
  ],
  "subjects": [
    {
      "field": "chemistry",
      "origin": "arxiv:physics.chem-ph",
      "subfield": "physical"
    },
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.mtrl-sci",
      "subfield": "condensed-matter"
    },
    {
      "field": "physics",
      "origin": "arxiv:quant-ph",
      "subfield": "quantum"
    }
  ],
  "title": "Quantum electrodynamics of equilibrium systems: A rigorous Maxwell-regularized functional-theoretic formulation",
  "title_text": "Quantum electrodynamics of equilibrium systems: A rigorous Maxwell-regularized functional-theoretic formulation",
  "type": "preprint",
  "updated_at": "2026-10-30T12:22:01Z",
  "url": "https://research.draconitic.com/paper/09zxmf4q0d46z",
  "venue": "arXiv",
  "versions": []
}