{"schema":"pubphys.bundle/1","record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"a82ce92cbe726070d1a6cf9b386db11280adf8323d15071c8d77c94bf05719a1","created":"2026-10-03T07:18:09Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011","caca05118b75962c6d50d87d66ca34bd7aba2cb204f1c96e97912487f1ce95ba"],"salt":"935f7796987a0ae92e24f8723ebc2fa6d8f6ac8443f8f954293021f8447954e7","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"yes-no","assisted_by":[],"external_id":"amo.macroscopic-optomechanics.csl-grw-test","kind":"well-posed","literature_status":"open","n":"1","parents":[{"note":"Excluding the GRW point is one point of closing the CSL window","parent_revision":"caca05118b75962c6d50d87d66ca34bd7aba2cb204f1c96e97912487f1ce95ba","relation":"special_case"}],"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 $\\lambda = 1e-16\\ \\mathrm{s}^{-1}$ at $r_C = 1e-5\\ \\mathrm{cm}$ (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":null,"references":"","settled_by":"An interferometry or heating experiment whose excess-decoherence bound lies below lambda = 1e-16 s^-1 at r_C = 1e-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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