{
  "abstract": "Light spin-zero bosons with scalar and pseudoscalar couplings mediate a parity- and time-reversal-violating monopole-dipole interaction between unpolarized matter and polarized spins. For proton spins, the interaction has been probed directly only at ranges $λ\\gtrsim$ 5 mm; below this range, laboratory limits are inferred from neutron-dominated nuclei through nuclear-spin models. We analyze a direct search with a single-domain $^{87}$Rb spinor Bose-Einstein condensate in close proximity to a source mass. The F=1 and F=2 manifolds act as two co-located magnetometers that precess in opposite directions in a magnetic field but in the same direction under the exotic interaction. They thus form a natural comagnetometer, in which the sum of their precession angles suppresses field noise by a measured 44 dB and a weighted sum cancels the field altogether. Taking as a starting point the demonstrated magnetometry [Palacios et al. Proc. Nat. Acad. Sci. \\textbf{119}, e2115339119 (2022)] and comagnetometry [Gomez et al. Phys. Ref. Lett. \\textbf{124}, 170401 (2020)] performance of the $^{87}$Rb single-domain spinor condensate at ICFO [Palacios et al. New J. Phys. \\textbf{20}, 053008 (2018)], we study the projected sensitivity as a function of source-mass geometry and in-progress improvements to atom loading methods, trap beam geometry, and magnetic environment. With an insulating bismuth germanate source mass with a spherical top, whose apex sits 50 $μ$m below the center of the condensate, one week of acquisition would reach $|g_s^N g_p^p|\\approx 2\\times10^{-22}$ with these upgrades and $3\\times10^{-24}$ at the projection-noise limit ($λ=100\\, μ$m, 95\\% C.L.). This is more than three and five orders of magnitude below existing laboratory limits. The improvement covers boson masses of 0.3-50 meV/c$^2$ after the upgrades and 0.09-70 meV/c$^2$ at the projection-noise limit.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.22346",
  "author_total": 3,
  "authors": [
    {
      "name": "Wenjing Zhou"
    },
    {
      "name": "Diego Blas"
    },
    {
      "name": "Morgan W. Mitchell"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/45e21ete7tf84.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.22346",
  "fulltext_url": null,
  "id": "45e21ete7tf84",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.22346",
  "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.atom-ph"
    ],
    [
      "openalex",
      "3107|Atomic and Subatomic Physics Research"
    ]
  ],
  "openalex": "W7222449775",
  "pdf_url": "https://arxiv.org/pdf/2610.22346",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-15",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/45e21ete7tf84.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:29:50Z",
      "native_id": "2610.22346",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.22346"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:physics.atom-ph",
      "subfield": "amo"
    }
  ],
  "title": "Projected sensitivity of a spinor Bose-Einstein condensate comagnetometer to proton monopole-dipole interactions",
  "title_text": "Projected sensitivity of a spinor Bose-Einstein condensate comagnetometer to proton monopole-dipole interactions",
  "type": "preprint",
  "updated_at": "2026-10-30T12:29:50Z",
  "url": "https://research.draconitic.com/paper/45e21ete7tf84",
  "venue": "arXiv",
  "versions": []
}