{
  "abstract": "Reconstruction of anisotropic cosmic birefringence from the CMB is limited by lensing $B$-mode sample variance and partially degenerate with the lensing curl. We study the joint reconstruction of lensing (gradient and curl) and birefringence at the maximum-a-posteriori point, whose spectra are near-optimal statistics. We predict the joint response and noise analytically, validate them on simulations, and show unbiased inference of its amplitude. Errors will shrink $5$-fold relative to quadratic estimators at SPT-3G+ depths, promising much tighter constraints on parity-violating new physics, owing to the removal of the lensing $B$-polarization sample variance.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2611.03761",
  "author_total": 2,
  "authors": [
    {
      "name": "Sebastian Belkner"
    },
    {
      "name": "Julien Carron"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/00k3tpv97e42d.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2611.03761",
  "fulltext_url": null,
  "id": "00k3tpv97e42d",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2611.03761",
  "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",
      "astro-ph.CO"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2611.03761",
  "pmcid": null,
  "pmid": null,
  "published": "2026-11-02",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/00k3tpv97e42d.ris",
  "sources": [
    {
      "first_seen": "2026-11-04T15:21:25Z",
      "native_id": "2611.03761",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2611.03761"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.CO",
      "subfield": "cosmology"
    }
  ],
  "title": "De-lensing cosmic birefringence with joint reconstruction",
  "title_text": "De-lensing cosmic birefringence with joint reconstruction",
  "type": "preprint",
  "updated_at": "2026-11-04T15:21:25Z",
  "url": "https://research.draconitic.com/paper/00k3tpv97e42d",
  "venue": "arXiv",
  "versions": []
}