{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:6H5QRSC5PBIZG2LIB5UUNOKQ5R","short_pith_number":"pith:6H5QRSC5","canonical_record":{"source":{"id":"1905.03295","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2019-05-08T18:55:24Z","cross_cats_sorted":["hep-lat","nucl-th"],"title_canon_sha256":"d750fedefb10b34984438c5195979200d3b0cc88ca454794c927ff3301e64245","abstract_canon_sha256":"19aa6bfcfb52e9c3a2f0068d51b5db5bb0e158b7f830dab6c53da7193503cb07"},"schema_version":"1.0"},"canonical_sha256":"f1fb08c85d78519369680f6946b950ec42df0c23da59c3ff487abc926b4392d2","source":{"kind":"arxiv","id":"1905.03295","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1905.03295","created_at":"2026-07-05T00:57:05Z"},{"alias_kind":"arxiv_version","alias_value":"1905.03295v1","created_at":"2026-07-05T00:57:05Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1905.03295","created_at":"2026-07-05T00:57:05Z"},{"alias_kind":"pith_short_12","alias_value":"6H5QRSC5PBIZ","created_at":"2026-07-05T00:57:05Z"},{"alias_kind":"pith_short_16","alias_value":"6H5QRSC5PBIZG2LI","created_at":"2026-07-05T00:57:05Z"},{"alias_kind":"pith_short_8","alias_value":"6H5QRSC5","created_at":"2026-07-05T00:57:05Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:6H5QRSC5PBIZG2LIB5UUNOKQ5R","target":"record","payload":{"canonical_record":{"source":{"id":"1905.03295","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2019-05-08T18:55:24Z","cross_cats_sorted":["hep-lat","nucl-th"],"title_canon_sha256":"d750fedefb10b34984438c5195979200d3b0cc88ca454794c927ff3301e64245","abstract_canon_sha256":"19aa6bfcfb52e9c3a2f0068d51b5db5bb0e158b7f830dab6c53da7193503cb07"},"schema_version":"1.0"},"canonical_sha256":"f1fb08c85d78519369680f6946b950ec42df0c23da59c3ff487abc926b4392d2","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T00:57:05.018694Z","signature_b64":"m129wh5HSA9e7/ZKHpSpjbpGHLmZ62OHWVH9xtxQdsVGbX786hI64EDT7B5QlVt/pUwqoBxm8KYa8csRY31DDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"f1fb08c85d78519369680f6946b950ec42df0c23da59c3ff487abc926b4392d2","last_reissued_at":"2026-07-05T00:57:05.018152Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T00:57:05.018152Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1905.03295","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T00:57:05Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"u6pXKsxnA2IKoT42kPvVMAaBFkywRhkB+kTtmJuL0OV/u86rIJ0e/pHE8diXTiTCdgxMEoTHPUQtKojr6d0qDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-01T13:31:16.290523Z"},"content_sha256":"14b2fa252b3ab7cf8a6aab60e5e80eaa04f7d0c4e6546320a6f29594a66ea73c","schema_version":"1.0","event_id":"sha256:14b2fa252b3ab7cf8a6aab60e5e80eaa04f7d0c4e6546320a6f29594a66ea73c"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:6H5QRSC5PBIZG2LIB5UUNOKQ5R","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Chiral symmetry breaking, entanglement, and the nucleon spin decomposition","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["hep-lat","nucl-th"],"primary_cat":"hep-ph","authors_text":"Peter Ehlers, Silas R. Beane","submitted_at":"2019-05-08T18:55:24Z","abstract_excerpt":"The nucleon is naturally viewed as a bipartite system of valence spin -- defined by its non-vanishing chiral charge -- and non-valence or sea spin. The sea spin can be traced over to give a reduced density matrix, and it is shown that the resulting entanglement entropy acts as an order parameter of chiral symmetry breaking in the nucleon. In the large-$N_c$ limit, the entanglement entropy vanishes and the valence spin accounts for all of the nucleon spin, while in the limit of maximal entanglement entropy, the nucleon loses memory of the valence spin and consequently has spin dominated by the "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1905.03295","kind":"arxiv","version":1},"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/1905.03295/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":"2026-07-05T00:57:05Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"6qcx6VWCW/f/FWeb74wwv8bqMNj6exX8WZSiYSjGqCUkFEoBmVBcnU/E8T056cjVajikdBhBHXRolf3Zn73BCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-01T13:31:16.291017Z"},"content_sha256":"8bc20da8b891ec4560a9e2f7c5917ff3d922996d9b79f4acb36a13b29bee4307","schema_version":"1.0","event_id":"sha256:8bc20da8b891ec4560a9e2f7c5917ff3d922996d9b79f4acb36a13b29bee4307"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/6H5QRSC5PBIZG2LIB5UUNOKQ5R/bundle.json","state_url":"https://pith.science/pith/6H5QRSC5PBIZG2LIB5UUNOKQ5R/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/6H5QRSC5PBIZG2LIB5UUNOKQ5R/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":"2026-08-01T13:31:16Z","links":{"resolver":"https://pith.science/pith/6H5QRSC5PBIZG2LIB5UUNOKQ5R","bundle":"https://pith.science/pith/6H5QRSC5PBIZG2LIB5UUNOKQ5R/bundle.json","state":"https://pith.science/pith/6H5QRSC5PBIZG2LIB5UUNOKQ5R/state.json","well_known_bundle":"https://pith.science/.well-known/pith/6H5QRSC5PBIZG2LIB5UUNOKQ5R/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:6H5QRSC5PBIZG2LIB5UUNOKQ5R","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":"19aa6bfcfb52e9c3a2f0068d51b5db5bb0e158b7f830dab6c53da7193503cb07","cross_cats_sorted":["hep-lat","nucl-th"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2019-05-08T18:55:24Z","title_canon_sha256":"d750fedefb10b34984438c5195979200d3b0cc88ca454794c927ff3301e64245"},"schema_version":"1.0","source":{"id":"1905.03295","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1905.03295","created_at":"2026-07-05T00:57:05Z"},{"alias_kind":"arxiv_version","alias_value":"1905.03295v1","created_at":"2026-07-05T00:57:05Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1905.03295","created_at":"2026-07-05T00:57:05Z"},{"alias_kind":"pith_short_12","alias_value":"6H5QRSC5PBIZ","created_at":"2026-07-05T00:57:05Z"},{"alias_kind":"pith_short_16","alias_value":"6H5QRSC5PBIZG2LI","created_at":"2026-07-05T00:57:05Z"},{"alias_kind":"pith_short_8","alias_value":"6H5QRSC5","created_at":"2026-07-05T00:57:05Z"}],"graph_snapshots":[{"event_id":"sha256:8bc20da8b891ec4560a9e2f7c5917ff3d922996d9b79f4acb36a13b29bee4307","target":"graph","created_at":"2026-07-05T00:57:05Z","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/1905.03295/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"The nucleon is naturally viewed as a bipartite system of valence spin -- defined by its non-vanishing chiral charge -- and non-valence or sea spin. The sea spin can be traced over to give a reduced density matrix, and it is shown that the resulting entanglement entropy acts as an order parameter of chiral symmetry breaking in the nucleon. In the large-$N_c$ limit, the entanglement entropy vanishes and the valence spin accounts for all of the nucleon spin, while in the limit of maximal entanglement entropy, the nucleon loses memory of the valence spin and consequently has spin dominated by the ","authors_text":"Peter Ehlers, Silas R. Beane","cross_cats":["hep-lat","nucl-th"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2019-05-08T18:55:24Z","title":"Chiral symmetry breaking, entanglement, and the nucleon spin decomposition"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1905.03295","kind":"arxiv","version":1},"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":"sha256:14b2fa252b3ab7cf8a6aab60e5e80eaa04f7d0c4e6546320a6f29594a66ea73c","target":"record","created_at":"2026-07-05T00:57:05Z","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":"19aa6bfcfb52e9c3a2f0068d51b5db5bb0e158b7f830dab6c53da7193503cb07","cross_cats_sorted":["hep-lat","nucl-th"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2019-05-08T18:55:24Z","title_canon_sha256":"d750fedefb10b34984438c5195979200d3b0cc88ca454794c927ff3301e64245"},"schema_version":"1.0","source":{"id":"1905.03295","kind":"arxiv","version":1}},"canonical_sha256":"f1fb08c85d78519369680f6946b950ec42df0c23da59c3ff487abc926b4392d2","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"f1fb08c85d78519369680f6946b950ec42df0c23da59c3ff487abc926b4392d2","first_computed_at":"2026-07-05T00:57:05.018152Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T00:57:05.018152Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"m129wh5HSA9e7/ZKHpSpjbpGHLmZ62OHWVH9xtxQdsVGbX786hI64EDT7B5QlVt/pUwqoBxm8KYa8csRY31DDw==","signature_status":"signed_v1","signed_at":"2026-07-05T00:57:05.018694Z","signed_message":"canonical_sha256_bytes"},"source_id":"1905.03295","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:14b2fa252b3ab7cf8a6aab60e5e80eaa04f7d0c4e6546320a6f29594a66ea73c","sha256:8bc20da8b891ec4560a9e2f7c5917ff3d922996d9b79f4acb36a13b29bee4307"],"state_sha256":"300200077884b4d0b90d065cf9dded938af2c287fdb2cb3bbd75b18cc57df037"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"D+5MBKsxMKy6XhNUQcEQjTwa/4uvfrhoF9xsoaxhVI850P1dO5zQ2dNmgvW7pMXFGD9+IHcV1IV1v/sUfQvfBQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-01T13:31:16.294605Z","bundle_sha256":"7224f66a307291bee9e938dfbb45b884cf6bea8fd5dcf070bdf7d3e4556499f0"}}