{"schema":"pubphys.bundle/1","record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"0e32e7f2e00547daabf4485210282427feae1f4df5e6fde6072114701ad05593","created":"2026-10-03T07:18:00Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"5be2a63323dd5fec6fdc727d331628c587b536fae8d55618274e277f812d6a69","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"value","assisted_by":[],"external_id":"cm.one-over-f-noise.low-frequency-cutoff","kind":"well-posed","literature_status":"open","n":"1","parents":[],"plain":"If the 1/f law held down to zero frequency, the total noise power would grow without limit. No measurement has found where the law stops.","posed_since":"","precise":"The integral of a $1/f$ spectrum diverges logarithmically at both ends, so a physical system needs a lower cutoff $f_{\\min}$, set in the fluctuator picture by the longest relaxation time $\\tau_{\\max} \\sim \\tau_0 \\operatorname{exp}(E_{\\max}/T)$. Measurements over many decades have not found a flattening. Determine $f_{\\min}$ in a specific well-characterized system (metal film or SQUID) and relate it to the fluctuator distribution.","problem_ref":null,"references":"","settled_by":"Long, drift-controlled noise records on a stable device showing a flattening of S(f), compared with an independently measured distribution of fluctuator relaxation times.","status_note":"","title":"Where does 1/f noise stop at low 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