{"schema":"pubphys.bundle/1","record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"47937556dfd543160fb4f0f77bd0147d15b827393e41bbea273c2efa0be2d0ce","created":"2026-10-03T07:18:09Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"42e6cb5a4872201c88694073e7c8e3422f41ff7e465381c3a267e60e33b186d3","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"yes-no","assisted_by":[],"external_id":"qi.collapse-models.markovian-csl-window","kind":"well-posed","literature_status":"partially-resolved","n":"1","parents":[],"plain":"The best-studied collapse model, continuous spontaneous localization (CSL), has two numbers: how often collapse happens and over what distance. In 2025 a dark-matter detector excluded the originally proposed values; the question is whether any values remain that still collapse visible objects fast enough.","posed_since":"1990","precise":"Markovian (white-noise) CSL has collapse rate $\\lambda$ and correlation length $r_{C}$. X-ray spontaneous emission in XENONnT gives $\\lambda / r_{C}^{2} < 3.0e-7\\,\\mathrm{s}^{-1}\\,\\mathrm{cm}^{-2}$ (90 percent C.L.) for $r_{C}$ below about $1e-3\\,\\mathrm{cm}$; mechanical and interferometric bounds cover larger $r_{C}$. Theoretical lower bounds require collapse of a barely visible object within about $1e-2\\,\\mathrm{s}$. Determine whether the region between experimental upper bounds and theoretical lower bounds is empty for all $r_{C}$.","problem_ref":null,"references":"","settled_by":"Spontaneous-radiation, heating and interferometric bounds that, with an agreed macroscopic-collapse criterion, exclude or leave open a region of the $(\\lambda, r_C)$ plane.","status_note":"XENONnT (Phys. Rev. Lett. 136, 120201, 2026) excluded the GRW values $\\lambda = 1e-16\\ \\mathrm{s}^{-1}$, $r_{C} = 1e-5\\ \\mathrm{cm}$ at $9.1\\sigma$, improving the previous X-ray bound about 135-fold.","title":"Does any parameter window of white-noise CSL remain 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