{
  "abstract": "Electroweak $Z$ strings are generally unstable, and their Nambu-monopole endpoints lack topological protection in the bulk. Using degenerate inert and inert-like Higgs vacua as a solvable reference, we show that their interface supports both defects. The analytic interface carries a normalizable $SU(2)$ relative-orientation field. Its effective theory supports locally stable unit-flux $Z$ strings in a one-vacuum phase and fractional $Z$ strings in a two-vacuum phase. The fractional string carries an $S^2$ orientation field; a Nambu monopole is a second kink between symmetry-related, equal-tension $Z$ strings. We identify phases in which Nambu monopoles are confined or deconfined within the interface: in the confined phase, their $Z$ flux is concentrated into fractional strings, whereas in the deconfined phase, the monopole becomes a vortex within the interface and its $Z$ flux spreads radially through the interface. The electromagnetic magnetic field extends outside the interface in both phases. We determine analytic string profiles, effective-theory stability regions, and the unchanged electromagnetic magnetic charge across this confinement transition.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.39173",
  "author_total": 1,
  "authors": [
    {
      "name": "Muneto Nitta"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/bnt8ppxcg0y7x.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.39173",
  "fulltext_url": null,
  "id": "bnt8ppxcg0y7x",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.39173",
  "language": null,
  "licence": "LicenseRef-arXiv-nonexclusive-1.0",
  "licence_label": "arXiv licence",
  "licence_source": "article",
  "licence_url": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "hep-ph"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2610.39173",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-29",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/bnt8ppxcg0y7x.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:36:23Z",
      "native_id": "2610.39173",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.39173"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:hep-ph",
      "subfield": "high-energy"
    }
  ],
  "title": "Stable Electroweak Strings and Nambu Monopoles Nested at Inert-Higgs Interfaces",
  "title_text": "Stable Electroweak Strings and Nambu Monopoles Nested at Inert-Higgs Interfaces",
  "type": "preprint",
  "updated_at": "2026-11-01T12:20:45Z",
  "url": "https://research.draconitic.com/paper/bnt8ppxcg0y7x",
  "venue": "arXiv",
  "versions": []
}