{"schema":"pubphys.bundle/1","record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"c9bbb07433518ff57025ef529d575e172af81b01bd8b4b064dd7725aacb293f2","created":"2026-10-03T07:18:09Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011","c1f790f8de35d3d5f60c9a6639d7ec2e82b87f301b7e81cc6890231b220c7bef"],"salt":"284dcc691df0fa58cb3229860d86892be953e9b25ae75d218b98dde02d2a90f0","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"yes-no","assisted_by":[],"external_id":"qi.gravity-quantum.cq-decoherence-diffusion","kind":"well-posed","literature_status":"open","n":"1","parents":[{"note":"","parent_revision":"c1f790f8de35d3d5f60c9a6639d7ec2e82b87f301b7e81cc6890231b220c7bef","relation":"special_case"}],"plain":"If gravity is classical while matter is quantum, consistency requires gravity to both blur superpositions and make the gravitational pull jitter randomly. Measuring both effects together can exclude such theories.","posed_since":"2022","precise":"In classical-quantum gravity (Oppenheim and coworkers), the decoherence coefficient $D_2$ for mass superpositions and the diffusion coefficient $D_0$ of the Newtonian potential obey a trade-off with $D_0D_2$ bounded below (Oppenheim, Sparaciari, Soda, Weller-Davies, Nature Communications 2023). Determine whether coherence times from matter-wave interferometry combined with acceleration-noise data (torsion balances, Cavendish-type experiments, LISA Pathfinder) exclude the entire allowed $(D_0,D_2)$ region for each choice of kernel.","problem_ref":null,"references":"","settled_by":"Joint bounds from interferometric coherence and gravitational acceleration noise leaving no allowed $(D_{0}, D_{2})$ for the model class.","status_note":"The trade-off was derived in 2022-2023 (arXiv:2203.01982); 2025 proposals test it via classical diffusion of probe masses (arXiv:2501.13030).","title":"Close the decoherence-diffusion window for classical 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