{"schema":"pubphys.bundle/1","record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"b74a0180bb5892038bdde67f667bd04b4f73d11b58a59167b454d0b3f546d9a5","created":"2026-10-15T23:43:22Z","files":[],"origin":{"assisted_by":["ai:gpt-5.5"],"kind":"seed"},"parents":["17fea577727dce1463a35a5f6a21d47a411419089673c746753adc319a973739","ce59fb6cd812fc05906d0c60a71c75ea22bc686bcf38e7c3ef7010834d98ee7b"],"salt":"4279962f22ce4d181f85dc963d819098a5abdd1064fa2fe507fb889c5ff5cf24","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"yes-no","assisted_by":["ai:gpt-5.5"],"external_id":"amo.macroscopic-optomechanics.csl-grw-test","kind":"well-posed","literature_status":"open","n":"2","parents":[],"plain":"Collapse models modify quantum mechanics so that large objects lose superpositions on their own. The original proposed rate has never been ruled out.","posed_since":"1986","precise":"Continuous spontaneous localization with rate $\\lambda$ and length $r_C$. Exclude $\\lambda = 10^{-16}\\ \\mathrm{s}^{-1}$ at $r_C = 10^{-5}\\ \\mathrm{cm}$ (the GRW value of Ghirardi, Rimini and Weber) by interferometric or non-interferometric (heating, noise) tests with massive objects. Answer: yes or no, with the excluded region in the $(\\lambda, r_C)$ plane.","problem_ref":"17fea577727dce1463a35a5f6a21d47a411419089673c746753adc319a973739","references":"","settled_by":"An interferometry or heating experiment whose excess-decoherence bound lies below $\\lambda$ = $10^{-16}$ $\\mathrm{s}^{-1}$ at $r_C$ = $10^{-5}$ cm.","status_note":"Non-interferometric tests (to 2021) constrain the enhanced Adler rates, and 2025 interference of sodium clusters above 170,000 amu (Pedalino et al., arXiv:2507.21211) tightened interferometric bounds; the GRW point is not reported excluded, which should be checked against the 2025 exclusion plot.","title":"Can massive superpositions exclude the GRW collapse 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