{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"06c0f920704123795e5312900efc077576a00993b478a9fe04ee4147bd8387fa","created":"2026-10-03T07:18:04Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"12aa4b18f84c5777d1895cadccf8cda60ccdbc6cf9c7ebe1d03e9e36b4708181","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"mechanism","assisted_by":[],"external_id":"grav.problem-of-time.global-time","kind":"phenomenon","literature_status":"open","n":"1","parents":[],"plain":"Physical clocks in gravitating systems can stop or run backward, and in chaotic systems no variable may serve as a good clock everywhere. The usual recipe for evolution in time then breaks down.","posed_since":"","precise":"For constrained systems in which every candidate clock function T has turning points along classical orbits (the global problem of time, for example chaotic Bianchi IX minisuperspace), determine whether a consistent unitary relational dynamics exists, by patching local clocks or otherwise, and whether its predictions are independent of the patching. An answer is a construction with proven clock-change consistency in a chaotic model, or a no-go theorem.","problem_ref":null,"references":"","settled_by":"A worked chaotic minisuperspace model with a proven consistent, patch-independent relational dynamics, or a proof that none exists.","status_note":"","title":"How is quantum evolution defined when no global clock exists?","topic_ref":"266bbe8da17b18c5bdcf2f6e3eb994ed918fe1decf73bbef01ce81ac54cc2474"},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"e3cbe8fed917de95c49cc565772d751f5d423b0500f116b7f232f3cd90da7759","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"8965311b2fe94dbd2069e3027a9c4ba3a58dbe988d1ea134814c6628507a3117","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"id7doHwkvVG5rwJ3eX6su3fJ5X87F9zJSBvIviCCCRr05unziagr4xEW368kcLREf6v0tcs9rYTqWDAclFy_BA"},"schema":"pubphys.envelope/1"},"record_hash":"e3cbe8fed917de95c49cc565772d751f5d423b0500f116b7f232f3cd90da7759","leaf_index":1492}