{"schema":"pubphys.bundle/1","record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"71216cf30da3af7604da5cd5a7c689d7a072350adf733e317b9b07ff8a36e812","created":"2026-10-03T07:18:09Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"4e35f091403a4aed39673b94d9f96a4b12c98680d26a5c6beac2ad7c26f40283","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"yes-no","assisted_by":[],"external_id":"qi.collapse-models.diosi-penrose-test","kind":"well-posed","literature_status":"partially-resolved","n":"1","parents":[],"plain":"Penrose proposed that a mass in a superposition of two places decays in a time of about $\\hbar$ divided by the gravitational energy of the difference between the two mass arrangements. Detecting or excluding this needs massive superpositions or very quiet detectors.","posed_since":"","precise":"In the Diosi-Penrose model a superposition decays at rate $\\Gamma = E_G / \\hbar$, with $E_G$ the gravitational self-energy of the difference of the two mass distributions, regularized by a length $R_0$. X-ray bounds give $R_0 > 4.9e-8\\,\\mathrm{cm}$ (XENONnT, 90 percent C.L.) for the Markovian version. Determine whether a superposition experiment, or a non-radiating dissipative version of the model, can reach the regime where $\\Gamma$ exceeds all environmental decoherence for allowed $R_0$, and measure or exclude it.","problem_ref":null,"references":"","settled_by":"Observation or exclusion of excess decoherence at rate $E_{G} / \\hbar$ in a massive superposition where environmental rates are below it.","status_note":"Underground X-ray searches (Donadi et al., Nature Physics 2021; XENONnT, Phys. Rev. Lett. 136, 120201, 2026) excluded the Markovian model with $R_0$ below about $5e-8\\,\\mathrm{cm}$, about fivefold beyond the previous Majorana Demonstrator bound; larger $R_0$ and dissipative versions are untested.","title":"Test of gravity-related collapse in the Diosi-Penrose 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