{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:1993:4DVIOUGNVDJN27VGKNVMFOFTBJ","short_pith_number":"pith:4DVIOUGN","canonical_record":{"source":{"id":"gr-qc/9302018","kind":"arxiv","version":2},"metadata":{"license":"","primary_cat":"gr-qc","submitted_at":"1993-02-17T05:54:01Z","cross_cats_sorted":["hep-th"],"title_canon_sha256":"900ab858023548e0bb1dd4ca3b0d5efec77cf28a0f19c9ea471e6ca6ba58d4f8","abstract_canon_sha256":"4618d7a5442d24ee468fb1b52f465787889a6c9f5c9dd6909b0997c2e38f64dc"},"schema_version":"1.0"},"canonical_sha256":"e0ea8750cda8d2dd7ea6536ac2b8b30a5106bf3a7031f5ff0ceedce3e91cf8cd","source":{"kind":"arxiv","id":"gr-qc/9302018","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"gr-qc/9302018","created_at":"2026-07-04T15:07:24Z"},{"alias_kind":"arxiv_version","alias_value":"gr-qc/9302018v2","created_at":"2026-07-04T15:07:24Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.gr-qc/9302018","created_at":"2026-07-04T15:07:24Z"},{"alias_kind":"pith_short_12","alias_value":"4DVIOUGNVDJN","created_at":"2026-07-04T15:07:24Z"},{"alias_kind":"pith_short_16","alias_value":"4DVIOUGNVDJN27VG","created_at":"2026-07-04T15:07:24Z"},{"alias_kind":"pith_short_8","alias_value":"4DVIOUGN","created_at":"2026-07-04T15:07:24Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:1993:4DVIOUGNVDJN27VGKNVMFOFTBJ","target":"record","payload":{"canonical_record":{"source":{"id":"gr-qc/9302018","kind":"arxiv","version":2},"metadata":{"license":"","primary_cat":"gr-qc","submitted_at":"1993-02-17T05:54:01Z","cross_cats_sorted":["hep-th"],"title_canon_sha256":"900ab858023548e0bb1dd4ca3b0d5efec77cf28a0f19c9ea471e6ca6ba58d4f8","abstract_canon_sha256":"4618d7a5442d24ee468fb1b52f465787889a6c9f5c9dd6909b0997c2e38f64dc"},"schema_version":"1.0"},"canonical_sha256":"e0ea8750cda8d2dd7ea6536ac2b8b30a5106bf3a7031f5ff0ceedce3e91cf8cd","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T15:07:24.906281Z","signature_b64":"C/LcpeHaUE8HduugX5vdqQlxbymCxq70KJug6VwJsH0y1A3MwroB43vCQiZTdnicDTh5chx4vjzHuSdenAehDA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"e0ea8750cda8d2dd7ea6536ac2b8b30a5106bf3a7031f5ff0ceedce3e91cf8cd","last_reissued_at":"2026-07-04T15:07:24.905919Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T15:07:24.905919Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"gr-qc/9302018","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-04T15:07:24Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"JcSP/ujLag77fV2EnHA2vT4Xm7BLurP0nKh/1K0idYThibNo28XgutF75FkoABsgqF/8tItNLbi0NFCM9+e8AQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-04T06:25:41.316072Z"},"content_sha256":"959e6f048da6ac79199b17825b928f512960123d48792c6c8f43e7445950df32","schema_version":"1.0","event_id":"sha256:959e6f048da6ac79199b17825b928f512960123d48792c6c8f43e7445950df32"},{"event_type":"graph_snapshot","subject_pith_number":"pith:1993:4DVIOUGNVDJN27VGKNVMFOFTBJ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Impossible Measurements on Quantum Fields","license":"","headline":"","cross_cats":["hep-th"],"primary_cat":"gr-qc","authors_text":"Rafael D. Sorkin","submitted_at":"1993-02-17T05:54:01Z","abstract_excerpt":"It is shown that the attempt to extend the notion of ideal measurement to quantum field theory leads to a conflict with locality, because (for most observables) the state vector reduction associated with an ideal measurement acts to transmit information faster than light. Two examples of such information-transfer are given, first in the quantum mechanics of a pair of coupled subsystems, and then for the free scalar field in flat spacetime. It is argued that this problem leaves the Hilbert space formulation of quantum field theory with no definite measurement theory, removing whatever advantage"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"gr-qc/9302018","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/gr-qc/9302018/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-04T15:07:24Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"mJO05lO6V7PgOKAY6tvKrfssYBpBDfA0PRWPo0dAhSpje3KdgOrywVkt9jCv+vMr575pRLSZ9kKe+ajtJRUeDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-04T06:25:41.317007Z"},"content_sha256":"3ebda591580a7fd568723a02e0766478c0ea3e8ed6c9c01228ff4e2b28ca97a9","schema_version":"1.0","event_id":"sha256:3ebda591580a7fd568723a02e0766478c0ea3e8ed6c9c01228ff4e2b28ca97a9"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/4DVIOUGNVDJN27VGKNVMFOFTBJ/bundle.json","state_url":"https://pith.science/pith/4DVIOUGNVDJN27VGKNVMFOFTBJ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/4DVIOUGNVDJN27VGKNVMFOFTBJ/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-08-04T06:25:41Z","links":{"resolver":"https://pith.science/pith/4DVIOUGNVDJN27VGKNVMFOFTBJ","bundle":"https://pith.science/pith/4DVIOUGNVDJN27VGKNVMFOFTBJ/bundle.json","state":"https://pith.science/pith/4DVIOUGNVDJN27VGKNVMFOFTBJ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/4DVIOUGNVDJN27VGKNVMFOFTBJ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:1993:4DVIOUGNVDJN27VGKNVMFOFTBJ","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"4618d7a5442d24ee468fb1b52f465787889a6c9f5c9dd6909b0997c2e38f64dc","cross_cats_sorted":["hep-th"],"license":"","primary_cat":"gr-qc","submitted_at":"1993-02-17T05:54:01Z","title_canon_sha256":"900ab858023548e0bb1dd4ca3b0d5efec77cf28a0f19c9ea471e6ca6ba58d4f8"},"schema_version":"1.0","source":{"id":"gr-qc/9302018","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"gr-qc/9302018","created_at":"2026-07-04T15:07:24Z"},{"alias_kind":"arxiv_version","alias_value":"gr-qc/9302018v2","created_at":"2026-07-04T15:07:24Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.gr-qc/9302018","created_at":"2026-07-04T15:07:24Z"},{"alias_kind":"pith_short_12","alias_value":"4DVIOUGNVDJN","created_at":"2026-07-04T15:07:24Z"},{"alias_kind":"pith_short_16","alias_value":"4DVIOUGNVDJN27VG","created_at":"2026-07-04T15:07:24Z"},{"alias_kind":"pith_short_8","alias_value":"4DVIOUGN","created_at":"2026-07-04T15:07:24Z"}],"graph_snapshots":[{"event_id":"sha256:3ebda591580a7fd568723a02e0766478c0ea3e8ed6c9c01228ff4e2b28ca97a9","target":"graph","created_at":"2026-07-04T15:07:24Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/gr-qc/9302018/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"It is shown that the attempt to extend the notion of ideal measurement to quantum field theory leads to a conflict with locality, because (for most observables) the state vector reduction associated with an ideal measurement acts to transmit information faster than light. Two examples of such information-transfer are given, first in the quantum mechanics of a pair of coupled subsystems, and then for the free scalar field in flat spacetime. It is argued that this problem leaves the Hilbert space formulation of quantum field theory with no definite measurement theory, removing whatever advantage","authors_text":"Rafael D. Sorkin","cross_cats":["hep-th"],"headline":"","license":"","primary_cat":"gr-qc","submitted_at":"1993-02-17T05:54:01Z","title":"Impossible Measurements on Quantum Fields"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"gr-qc/9302018","kind":"arxiv","version":2},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:959e6f048da6ac79199b17825b928f512960123d48792c6c8f43e7445950df32","target":"record","created_at":"2026-07-04T15:07:24Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"4618d7a5442d24ee468fb1b52f465787889a6c9f5c9dd6909b0997c2e38f64dc","cross_cats_sorted":["hep-th"],"license":"","primary_cat":"gr-qc","submitted_at":"1993-02-17T05:54:01Z","title_canon_sha256":"900ab858023548e0bb1dd4ca3b0d5efec77cf28a0f19c9ea471e6ca6ba58d4f8"},"schema_version":"1.0","source":{"id":"gr-qc/9302018","kind":"arxiv","version":2}},"canonical_sha256":"e0ea8750cda8d2dd7ea6536ac2b8b30a5106bf3a7031f5ff0ceedce3e91cf8cd","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"e0ea8750cda8d2dd7ea6536ac2b8b30a5106bf3a7031f5ff0ceedce3e91cf8cd","first_computed_at":"2026-07-04T15:07:24.905919Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T15:07:24.905919Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"C/LcpeHaUE8HduugX5vdqQlxbymCxq70KJug6VwJsH0y1A3MwroB43vCQiZTdnicDTh5chx4vjzHuSdenAehDA==","signature_status":"signed_v1","signed_at":"2026-07-04T15:07:24.906281Z","signed_message":"canonical_sha256_bytes"},"source_id":"gr-qc/9302018","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:959e6f048da6ac79199b17825b928f512960123d48792c6c8f43e7445950df32","sha256:3ebda591580a7fd568723a02e0766478c0ea3e8ed6c9c01228ff4e2b28ca97a9"],"state_sha256":"8d19b4faff7291761ba8f4d707184a8fa47a6915e24f50d37a133fbfda817e25"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"EB6HrfQSBK4Wgc6MZXc4Q3L4g1gVpvbNx2K+MQDJ4zO+CwqxIodxYNI1mY+EGgz8CfMTlc+MahSvDlAsIP2YAQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-04T06:25:41.323092Z","bundle_sha256":"00c1f316d28c2f940f564d3dccb014c1ca087fdef7fb449123283d0d99cdaca7"}}