{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:4WVL5A3O4IKT5HH55IO6XVXUC4","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":"851457e21cf5373a7ff99aa6c2140a742d525c688e31433a3117d11966d1ef36","cross_cats_sorted":["hep-th","math-ph","math.MP","quant-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2016-07-29T18:12:22Z","title_canon_sha256":"2400b8148fdf8b35511d6f78337d831e9e69e35847a158e78b6d0a716a8b75b2"},"schema_version":"1.0","source":{"id":"1607.08879","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1607.08879","created_at":"2026-05-18T00:48:17Z"},{"alias_kind":"arxiv_version","alias_value":"1607.08879v2","created_at":"2026-05-18T00:48:17Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1607.08879","created_at":"2026-05-18T00:48:17Z"},{"alias_kind":"pith_short_12","alias_value":"4WVL5A3O4IKT","created_at":"2026-05-18T12:29:58Z"},{"alias_kind":"pith_short_16","alias_value":"4WVL5A3O4IKT5HH5","created_at":"2026-05-18T12:29:58Z"},{"alias_kind":"pith_short_8","alias_value":"4WVL5A3O","created_at":"2026-05-18T12:29:58Z"}],"graph_snapshots":[{"event_id":"sha256:17aa3ed0440157d38dbf25dadf81b6de04a2c04400fc179b24d086070949ecf5","target":"graph","created_at":"2026-05-18T00:48:17Z","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"},"paper":{"abstract_excerpt":"The source-free Maxwell action is invariant under electric-magnetic duality rotations in arbitrary spacetimes. This leads to a conserved classical Noether charge. We show that this conservation law is broken at the quantum level in presence of a background classical gravitational field with a non-trivial Chern-Pontryagin invariant, in a parallel way to the chiral anomaly for massless Dirac fermions. Among the physical consequences, the net polarization of the quantum electromagnetic field is not conserved.","authors_text":"A. del Rio, I. Agullo, J. Navarro-Salas","cross_cats":["hep-th","math-ph","math.MP","quant-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2016-07-29T18:12:22Z","title":"Electromagnetic duality anomaly in curved spacetimes"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1607.08879","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":"sha256:32bf7befca6db295c230ada8a81f499ad15f73f8d676218d4684d0d57ef1f612","target":"record","created_at":"2026-05-18T00:48:17Z","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":"851457e21cf5373a7ff99aa6c2140a742d525c688e31433a3117d11966d1ef36","cross_cats_sorted":["hep-th","math-ph","math.MP","quant-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2016-07-29T18:12:22Z","title_canon_sha256":"2400b8148fdf8b35511d6f78337d831e9e69e35847a158e78b6d0a716a8b75b2"},"schema_version":"1.0","source":{"id":"1607.08879","kind":"arxiv","version":2}},"canonical_sha256":"e5aabe836ee2153e9cfdea1debd6f4170debb173020448b48574b86ef82b2371","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"e5aabe836ee2153e9cfdea1debd6f4170debb173020448b48574b86ef82b2371","first_computed_at":"2026-05-18T00:48:17.360413Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:48:17.360413Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"lrtymF4+x2ewrY54n4fQqfJdVMgSSgCnO5Evw9AWIoNAYob+/HR8Cne5DItxSbrXq3hJvVKI5btgkrbycI1+Dg==","signature_status":"signed_v1","signed_at":"2026-05-18T00:48:17.361043Z","signed_message":"canonical_sha256_bytes"},"source_id":"1607.08879","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:32bf7befca6db295c230ada8a81f499ad15f73f8d676218d4684d0d57ef1f612","sha256:17aa3ed0440157d38dbf25dadf81b6de04a2c04400fc179b24d086070949ecf5"],"state_sha256":"d59ed470e220907ddc4a3147cc42dc65c33b2df3b15244f4c054a5d288d750a1"}