{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"66c93ebf481db778779cc3f9ad9c3cdf562991e2e55eb12464f3d7ae3c26f646","created":"2026-10-15T23:43:22Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["ce59fb6cd812fc05906d0c60a71c75ea22bc686bcf38e7c3ef7010834d98ee7b","df7213aca5e52e3c25bed6c5b7d08c1b39eb9bde80fede6f3d6c9bb867744afc"],"salt":"0b94ccb52e8a028ed5123d15b0c692a87c9ac16b095b8720e7fd0e8a30fb7e21","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":"2","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 $R_0 > 4.9 \\times 10^{-8}\\,\\mathrm{cm}$ (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":"df7213aca5e52e3c25bed6c5b7d08c1b39eb9bde80fede6f3d6c9bb867744afc","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 $5 \\times 10^{-8}\\,\\mathrm{cm}$, 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 model","topic_ref":null},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"dc110d45747c528a5b73133cdc4518c0010d546ca064606a92092d340702b200","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"21d8787b4a636dca88a55feaeecd920d6ac96d9f2dd5f4a7e30e036e298aefc6","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"yURV8w3_J9-Yp5UEZ8q16sdGFrJCU5Oxp_DFgeM6_Tg-pHYMskFUhUcE0xCZVn5j_Rmoql-nTlZT64KChY21AQ"},"schema":"pubphys.envelope/1"},"record_hash":"dc110d45747c528a5b73133cdc4518c0010d546ca064606a92092d340702b200","leaf_index":3698}