{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2009:XO4WARGY6CB7A6MYYT45RGUQE5","short_pith_number":"pith:XO4WARGY","canonical_record":{"source":{"id":"0904.4477","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.stat-mech","submitted_at":"2009-04-28T20:47:56Z","cross_cats_sorted":["hep-th","quant-ph"],"title_canon_sha256":"09c4af94d431b75d01dbc0369ad38e5e95c6db913a22fbd99cfb4b0b5a569826","abstract_canon_sha256":"3debd1d50850917dfc795cbc4775072643581cbce56a7be54a192000f42414f3"},"schema_version":"1.0"},"canonical_sha256":"bbb96044d8f083f07998c4f9d89a90274bbfa335e2d45d0aedbbc6d2804b112c","source":{"kind":"arxiv","id":"0904.4477","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0904.4477","created_at":"2026-07-04T15:57:09Z"},{"alias_kind":"arxiv_version","alias_value":"0904.4477v1","created_at":"2026-07-04T15:57:09Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0904.4477","created_at":"2026-07-04T15:57:09Z"},{"alias_kind":"pith_short_12","alias_value":"XO4WARGY6CB7","created_at":"2026-07-04T15:57:09Z"},{"alias_kind":"pith_short_16","alias_value":"XO4WARGY6CB7A6MY","created_at":"2026-07-04T15:57:09Z"},{"alias_kind":"pith_short_8","alias_value":"XO4WARGY","created_at":"2026-07-04T15:57:09Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2009:XO4WARGY6CB7A6MYYT45RGUQE5","target":"record","payload":{"canonical_record":{"source":{"id":"0904.4477","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.stat-mech","submitted_at":"2009-04-28T20:47:56Z","cross_cats_sorted":["hep-th","quant-ph"],"title_canon_sha256":"09c4af94d431b75d01dbc0369ad38e5e95c6db913a22fbd99cfb4b0b5a569826","abstract_canon_sha256":"3debd1d50850917dfc795cbc4775072643581cbce56a7be54a192000f42414f3"},"schema_version":"1.0"},"canonical_sha256":"bbb96044d8f083f07998c4f9d89a90274bbfa335e2d45d0aedbbc6d2804b112c","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T15:57:09.900446Z","signature_b64":"1+cUnEMlslcwhwkQAUUrNnL/VQXA6iIAdVuN063OiyVMG9G8TZdxnueWt/6BA5fG5Ba+6qsklPNx55QessxCAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"bbb96044d8f083f07998c4f9d89a90274bbfa335e2d45d0aedbbc6d2804b112c","last_reissued_at":"2026-07-04T15:57:09.900079Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T15:57:09.900079Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0904.4477","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":"2026-07-04T15:57:09Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"3xBcw4OzU5xIygJ6OR5j3FMEVjmFPfoIu4WwG3i99vuSQUKxXxeqOSJfRY/BmPc9hlZySrt6xR2YQBy4LKDhCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-04T03:29:00.183598Z"},"content_sha256":"2e8124f33513be8f1eb494f180b5245443114298890f3eea1594d808497237c9","schema_version":"1.0","event_id":"sha256:2e8124f33513be8f1eb494f180b5245443114298890f3eea1594d808497237c9"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2009:XO4WARGY6CB7A6MYYT45RGUQE5","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Entanglement Entropy in the O(N) model","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["hep-th","quant-ph"],"primary_cat":"cond-mat.stat-mech","authors_text":"Carlos A. Fuertes, Max A. Metlitski, Subir Sachdev","submitted_at":"2009-04-28T20:47:56Z","abstract_excerpt":"It is generally believed that in spatial dimension d > 1 the leading contribution to the entanglement entropy S = - tr rho_A log rho_A scales as the area of the boundary of subsystem A. The coefficient of this \"area law\" is non-universal. However, in the neighbourhood of a quantum critical point S is believed to possess subleading universal corrections. In the present work, we study the entanglement entropy in the quantum O(N) model in 1 < d < 3. We use an expansion in epsilon = 3-d to evaluate i) the universal geometric correction to S for an infinite cylinder divided along a circular boundar"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0904.4477","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/0904.4477/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":"2026-07-04T15:57:09Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"kScjrjH7nzdOi2rrU9pnNZAbJDsiEfV/g30PDp2lUIb8zequBlAjeE8samcsL70Mjw44viGNsXbbVZL36r5HCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-04T03:29:00.184094Z"},"content_sha256":"175bb16e818fa4f3048de3e60a4dd8d65c12403ededfa93248abbdd7a3f19770","schema_version":"1.0","event_id":"sha256:175bb16e818fa4f3048de3e60a4dd8d65c12403ededfa93248abbdd7a3f19770"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/XO4WARGY6CB7A6MYYT45RGUQE5/bundle.json","state_url":"https://pith.science/pith/XO4WARGY6CB7A6MYYT45RGUQE5/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/XO4WARGY6CB7A6MYYT45RGUQE5/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":"2026-08-04T03:29:00Z","links":{"resolver":"https://pith.science/pith/XO4WARGY6CB7A6MYYT45RGUQE5","bundle":"https://pith.science/pith/XO4WARGY6CB7A6MYYT45RGUQE5/bundle.json","state":"https://pith.science/pith/XO4WARGY6CB7A6MYYT45RGUQE5/state.json","well_known_bundle":"https://pith.science/.well-known/pith/XO4WARGY6CB7A6MYYT45RGUQE5/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:XO4WARGY6CB7A6MYYT45RGUQE5","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":"3debd1d50850917dfc795cbc4775072643581cbce56a7be54a192000f42414f3","cross_cats_sorted":["hep-th","quant-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.stat-mech","submitted_at":"2009-04-28T20:47:56Z","title_canon_sha256":"09c4af94d431b75d01dbc0369ad38e5e95c6db913a22fbd99cfb4b0b5a569826"},"schema_version":"1.0","source":{"id":"0904.4477","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0904.4477","created_at":"2026-07-04T15:57:09Z"},{"alias_kind":"arxiv_version","alias_value":"0904.4477v1","created_at":"2026-07-04T15:57:09Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0904.4477","created_at":"2026-07-04T15:57:09Z"},{"alias_kind":"pith_short_12","alias_value":"XO4WARGY6CB7","created_at":"2026-07-04T15:57:09Z"},{"alias_kind":"pith_short_16","alias_value":"XO4WARGY6CB7A6MY","created_at":"2026-07-04T15:57:09Z"},{"alias_kind":"pith_short_8","alias_value":"XO4WARGY","created_at":"2026-07-04T15:57:09Z"}],"graph_snapshots":[{"event_id":"sha256:175bb16e818fa4f3048de3e60a4dd8d65c12403ededfa93248abbdd7a3f19770","target":"graph","created_at":"2026-07-04T15:57:09Z","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/0904.4477/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"It is generally believed that in spatial dimension d > 1 the leading contribution to the entanglement entropy S = - tr rho_A log rho_A scales as the area of the boundary of subsystem A. The coefficient of this \"area law\" is non-universal. However, in the neighbourhood of a quantum critical point S is believed to possess subleading universal corrections. In the present work, we study the entanglement entropy in the quantum O(N) model in 1 < d < 3. We use an expansion in epsilon = 3-d to evaluate i) the universal geometric correction to S for an infinite cylinder divided along a circular boundar","authors_text":"Carlos A. Fuertes, Max A. Metlitski, Subir Sachdev","cross_cats":["hep-th","quant-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.stat-mech","submitted_at":"2009-04-28T20:47:56Z","title":"Entanglement Entropy in the O(N) model"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0904.4477","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":"sha256:2e8124f33513be8f1eb494f180b5245443114298890f3eea1594d808497237c9","target":"record","created_at":"2026-07-04T15:57:09Z","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":"3debd1d50850917dfc795cbc4775072643581cbce56a7be54a192000f42414f3","cross_cats_sorted":["hep-th","quant-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.stat-mech","submitted_at":"2009-04-28T20:47:56Z","title_canon_sha256":"09c4af94d431b75d01dbc0369ad38e5e95c6db913a22fbd99cfb4b0b5a569826"},"schema_version":"1.0","source":{"id":"0904.4477","kind":"arxiv","version":1}},"canonical_sha256":"bbb96044d8f083f07998c4f9d89a90274bbfa335e2d45d0aedbbc6d2804b112c","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"bbb96044d8f083f07998c4f9d89a90274bbfa335e2d45d0aedbbc6d2804b112c","first_computed_at":"2026-07-04T15:57:09.900079Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T15:57:09.900079Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"1+cUnEMlslcwhwkQAUUrNnL/VQXA6iIAdVuN063OiyVMG9G8TZdxnueWt/6BA5fG5Ba+6qsklPNx55QessxCAg==","signature_status":"signed_v1","signed_at":"2026-07-04T15:57:09.900446Z","signed_message":"canonical_sha256_bytes"},"source_id":"0904.4477","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:2e8124f33513be8f1eb494f180b5245443114298890f3eea1594d808497237c9","sha256:175bb16e818fa4f3048de3e60a4dd8d65c12403ededfa93248abbdd7a3f19770"],"state_sha256":"16e9c0c858120da1d54abfa2efaad36f6cadc6747c0d48b0c1c8f96ac8e20b2b"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"MHDLNr+CsMob8l8PdDCF/b/2j0aGlc0gD/nkHsT0rt0+/eFob2aTHSkZXZsIDaZDPPyqz1FNZOORF9V5cYiQCg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-04T03:29:00.187583Z","bundle_sha256":"26ad45e899863604cc82360788ab38140911eeb20d25558b88ff1df38ff3dbe6"}}