{
  "abstract": "In 2021, a low-background experiment at the Gran Sasso National Laboratory searched for spontaneous radiation predicted by the standard Markovian Diósi-Penrose (DP) dynamics and obtained the new bound $R_0 > 5.4 \\times 10^{-11}\\,\\mathrm{m}$ at $95\\%$ probability for the short-length cutoff parameter. For germanium at the experimental temperature, the parameter-free prescription identifying $R_0$ with the spatial quantum spread of a nucleus gives $R_0 \\simeq 5 \\times 10^{-12}\\,\\mathrm{m}$. That particular combination, Diósi's stochastic dynamics and the Penrose-motivated mass-density resolution, was therefore excluded. Subsequent searches strengthened the cutoff bound. The Majorana Demonstrator improved it in 2022, and XENONnT has now obtained the world-leading limits $R_0 > 4.9 \\times 10^{-10}\\,\\mathrm{m}$ at $90\\%$ confidence level and $R_0 > 4.5 \\times 10^{-10}\\,\\mathrm{m}$ at $95\\%$ confidence level. These advances reinforce the 2021 exclusion but do not alter its logical scope: they \\emph{parametrically constrain} the Markovian, effectively white-noise DP dynamics, not Penrose's (and Diósi's) lifetime criterion independently of a dynamics, and not all colored-noise, dissipative, or otherwise modified gravity-related spontaneous collapse theories. We reconstruct what Gran Sasso did and did not rule out and place that conclusion in the present experimental context.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.35608",
  "author_total": 5,
  "authors": [
    {
      "name": "Catalina Curceanu"
    },
    {
      "name": "Nicola Bortolotti"
    },
    {
      "name": "Lajos Diósi"
    },
    {
      "name": "Simone Manti"
    },
    {
      "name": "Kristian Piscicchia"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/93etfvvmbx565.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.35608",
  "fulltext_url": null,
  "id": "93etfvvmbx565",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.35608",
  "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",
      "quant-ph"
    ],
    [
      "openalex",
      "3107|Quantum Mechanics and Applications"
    ]
  ],
  "openalex": "W7223828454",
  "pdf_url": "https://arxiv.org/pdf/2610.35608",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-26",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/93etfvvmbx565.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:35:35Z",
      "native_id": "2610.35608",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.35608"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:quant-ph",
      "subfield": "quantum"
    }
  ],
  "title": "Did the Gran Sasso Experiment Rule Out the Diósi-Penrose Theory? Musing on the 2021 Result and the Present Experimental Status",
  "title_text": "Did the Gran Sasso Experiment Rule Out the Diósi-Penrose Theory? Musing on the 2021 Result and the Present Experimental Status",
  "type": "preprint",
  "updated_at": "2026-10-30T12:35:35Z",
  "url": "https://research.draconitic.com/paper/93etfvvmbx565",
  "venue": "arXiv",
  "versions": []
}