{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"943b531a4b4859eee7749b0b0c6b43e9d72ca85b84a435dd3b813d26a6f53e57","created":"2026-10-03T07:18:09Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"5bf6f434c01a986cc911b4e18236a71afa2b6d2828a23b79eceb86bf9b94beaf","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"yes-no","assisted_by":[],"external_id":"qi.gravity-quantum.is-gravity-quantum","kind":"phenomenon","literature_status":"open","n":"1","parents":[],"plain":"If a mass is in two places at once, is its gravitational field also in two configurations at once, or is gravity a classical field that only responds to the average? Experiments at low energy can in principle decide.","posed_since":"1957","precise":"Determine whether the low-energy gravitational field of laboratory masses can exist in superpositions of distinct configurations and carry quantum information, or is a classical field coupled to quantum matter (mean-field semiclassical, stochastic classical-quantum, or collapse-based). An answer is an experimental result that excludes one class under stated assumptions, such as locality of the mediator.","problem_ref":null,"references":"","settled_by":"A gravitationally mediated entanglement experiment or a decoherence-diffusion measurement that excludes the classical-field model classes.","status_note":"","title":"Must the gravitational field obey quantum superposition?","topic_ref":"101461c166891c74d153ef2ee42bdf128bf11de35d6dfcf854295b5e7dfab008"},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"c1f790f8de35d3d5f60c9a6639d7ec2e82b87f301b7e81cc6890231b220c7bef","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"e4ca7dd5dc06889cccedc51895d4473f695868f13674fe488b10c4a684ade75d","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"DWI6knWlvaJBtLTCw0hwE4S4UFMAwFyJNIiuIPieDECUwuOM-5hmd0ss4RSPbq0bkrTWRcLg-YLg02mrxHvgAA"},"schema":"pubphys.envelope/1"},"record_hash":"c1f790f8de35d3d5f60c9a6639d7ec2e82b87f301b7e81cc6890231b220c7bef","leaf_index":1997}