{
  "abstract": "A bstract : We introduce a novel class of defects, termed crosscap defects , in conformal field theory (CFT) in general dimensions. These arise from quotienting the spacetime by a ℤ ₂ automorphism, and provide higher-codimension generalisations of CFTs on real projective space $$ \\left({\\mathbbm{RP}}^d\\right) $$ RP d . Crosscap defects extend along a p -dimensional fixed locus of the ℤ ₂ action and preserve an SO ( p + 1, 1) × PO ( d – p ) subgroup of the conformal group. The two-point functions of operators in this setup exhibit three operator product expansion channels: bulk, image, and defect. These lead to several crosscap crossing equations , which we present. We analyse conformal block decompositions and show that the blocks are identical to defect CFT blocks up to a redefinition of cross ratios. As concrete examples, we study crosscap defects in the O ( N ) model at the Gaussian and Wilson-Fisher fixed points in the ε -expansion. We compute explicitly the associated CFT data as a function of p and find that, unlike standard defects, displacement and tilt operators are absent for generic p . They provide examples of defect conformal manifolds without exactly marginal operators.",
  "abstract_shown": true,
  "affiliations": [
    "King’s College London",
    "Department of Theoretical Physics, CERN",
    "Laboratory for Theoretical Fundamental Physics, EPFL"
  ],
  "article_type": null,
  "arxiv": null,
  "author_total": 3,
  "authors": [
    {
      "affs": [
        0
      ],
      "name": "Nadav Drukker",
      "orcid": "0000-0003-4984-5736"
    },
    {
      "affs": [
        1
      ],
      "name": "Shota Komatsu",
      "orcid": "0000-0001-5251-8440"
    },
    {
      "affs": [
        1,
        2
      ],
      "name": "Anders Wallberg",
      "orcid": "0009-0006-2363-4008"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/5xav0w0sm0v63.bib",
  "cited_by": 0,
  "doi": "10.1007/jhep10(2026)241",
  "fulltext_url": null,
  "id": "5xav0w0sm0v63",
  "issns": [
    "1029-8479"
  ],
  "landing_url": "https://link.springer.com/article/10.1007/JHEP10(2026)241",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "https://creativecommons.org/licenses/by/4.0",
  "metadata_licence": null,
  "native_subjects": [
    [
      "openalex",
      "3106|Black Holes and Theoretical Physics"
    ]
  ],
  "openalex": "W7159560691",
  "pdf_url": "https://link.springer.com/content/pdf/10.1007/JHEP10(2026)241.pdf",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-23",
  "publisher": "Springer Science and Business Media LLC",
  "ris": "https://research.draconitic.com/paper/5xav0w0sm0v63.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:18:01Z",
      "native_id": "10.1007/jhep10(2026)241",
      "source": "crossref",
      "url": "https://link.springer.com/article/10.1007/JHEP10(2026)241"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "openalex:3106|Black Holes and Theoretical Physics",
      "subfield": "high-energy"
    }
  ],
  "title": "Crosscap defects",
  "title_text": "Crosscap defects",
  "type": "peer-reviewed",
  "updated_at": "2026-10-30T12:18:01Z",
  "url": "https://research.draconitic.com/paper/5xav0w0sm0v63",
  "venue": "Journal of High Energy Physics",
  "versions": []
}