{
  "abstract": "We present a method to obtain the proven exact 2-component (X2C) method, normally applied to Gaussian-type fixed Hilbert bases, in an adaptative non-uniform grid basis of the Hilbert space, namely Multiwavelets. The X2C method manages to block-diagonalise the Dirac Hamiltonian restricted to the subspace of the basis, in an energy-independent manner. The method takes inspiration from the success of the atomic mean-field X2C method on the Gaussian bases to represent the coupling operator as a projector onto the small components of the eigenstates of the constituent atoms of the system.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.07512",
  "author_total": 3,
  "authors": [
    {
      "name": "Quentin Pitteloud"
    },
    {
      "name": "Jacopo Masotti"
    },
    {
      "name": "Luca Frediani"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/egcza75w4gmth.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.07512",
  "fulltext_url": null,
  "id": "egcza75w4gmth",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.07512",
  "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.chem-ph"
    ],
    [
      "arxiv",
      "quant-ph"
    ],
    [
      "openalex",
      "3107|Advanced Chemical Physics Studies"
    ]
  ],
  "openalex": "W7220913075",
  "pdf_url": "https://arxiv.org/pdf/2610.07512",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-05",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/egcza75w4gmth.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:27:22Z",
      "native_id": "2610.07512",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.07512"
    }
  ],
  "subjects": [
    {
      "field": "chemistry",
      "origin": "arxiv:physics.chem-ph",
      "subfield": "physical"
    },
    {
      "field": "physics",
      "origin": "arxiv:quant-ph",
      "subfield": "quantum"
    }
  ],
  "title": "X2C-inspired approximation of the Dirac coupling operator in a multiwavelet basis",
  "title_text": "X2C-inspired approximation of the Dirac coupling operator in a multiwavelet basis",
  "type": "preprint",
  "updated_at": "2026-10-30T12:27:22Z",
  "url": "https://research.draconitic.com/paper/egcza75w4gmth",
  "venue": "arXiv",
  "versions": []
}