{"schema":"pubphys.bundle/1","record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"bd2c152013a529221c22e2dd6f31b325720d7ca85fa7d966e55cce2e64984df8","created":"2026-10-15T23:43:22Z","files":[],"origin":{"assisted_by":["ai:gpt-5.5"],"kind":"seed"},"parents":["ce59fb6cd812fc05906d0c60a71c75ea22bc686bcf38e7c3ef7010834d98ee7b","f78f3f5e34fe452eeba889276837aeb8e5ea9d65146057511cb4bc61ff8d06b0"],"salt":"c69309c015199f885aacfb6d84b3510f83f01edbc6b8e9905fb5712c291f4d79","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.efimov-universality.four-body-parameter","kind":"well-posed","literature_status":"partially-resolved","n":"2","parents":[],"plain":"Four atoms can also bind into states attached to each Efimov molecule. The question is whether their positions follow from the three-atom number alone, or need extra information.","posed_since":"2009","precise":"Zero-range theory predicts tetramer loss resonances at $a_{4},1 \\sim 0.43 a_{-}$ and $a_{4},2 \\sim 0.90 a_{-}$ (von Stecher, D'Incao, Greene 2009). With realistic van der Waals interactions, determine whether these ratios are universal to 5% or depend on short-range four-body physics. Answer: yes or no with a computed and measured spread across species.","problem_ref":"f78f3f5e34fe452eeba889276837aeb8e5ea9d65146057511cb4bc61ff8d06b0","references":"","settled_by":"Precision four-body loss spectroscopy in several species with a matching van der Waals four-body calculation.","status_note":"Cesium experiments since 2009 roughly match the zero-range ratios, but precision tests across species are missing.","title":"Is a separate four-body parameter needed for Efimov-linked 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