{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:KJIPZXLIA3K5CVDM36OZBIQRLW","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":"8d8fddd3aa00f9d22bb7642447459c48ac2d886033a6a468e7fdb66e6408b935","cross_cats_sorted":["cond-mat.str-el","math-ph","math.MP"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2015-07-13T19:13:39Z","title_canon_sha256":"35be76bb4b0a31db81dfc52b937fd1a2d40e40b3121244294a261833d500cc8a"},"schema_version":"1.0","source":{"id":"1507.03555","kind":"arxiv","version":5}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1507.03555","created_at":"2026-05-18T01:19:40Z"},{"alias_kind":"arxiv_version","alias_value":"1507.03555v5","created_at":"2026-05-18T01:19:40Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1507.03555","created_at":"2026-05-18T01:19:40Z"},{"alias_kind":"pith_short_12","alias_value":"KJIPZXLIA3K5","created_at":"2026-05-18T12:29:29Z"},{"alias_kind":"pith_short_16","alias_value":"KJIPZXLIA3K5CVDM","created_at":"2026-05-18T12:29:29Z"},{"alias_kind":"pith_short_8","alias_value":"KJIPZXLI","created_at":"2026-05-18T12:29:29Z"}],"graph_snapshots":[{"event_id":"sha256:a830ce5524bceba5fb53c6029818e95133503a9eabe971f7e93f774f25b07ad4","target":"graph","created_at":"2026-05-18T01:19:40Z","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":"We show that, measured in a backscattering geometry, the polar Kerr effect is absent if the nonlocal electromagnetic response function respects Onsager symmetry, characteristic of thermodynamic states that preserve time-reversal symmetry. A key element is an expression for the reflectivity tensor in terms of the retarded Green's function.","authors_text":"Steven A. Kivelson, Weejee Cho","cross_cats":["cond-mat.str-el","math-ph","math.MP"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2015-07-13T19:13:39Z","title":"Necessity of Time-Reversal Symmetry Breaking for the Polar Kerr Effect in Linear Response"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1507.03555","kind":"arxiv","version":5},"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":"sha256:01e2ea6f0747c67499524241a889439ace65d5f9c92e6ab8258c2e736b2fadde","target":"record","created_at":"2026-05-18T01:19:40Z","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":"8d8fddd3aa00f9d22bb7642447459c48ac2d886033a6a468e7fdb66e6408b935","cross_cats_sorted":["cond-mat.str-el","math-ph","math.MP"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2015-07-13T19:13:39Z","title_canon_sha256":"35be76bb4b0a31db81dfc52b937fd1a2d40e40b3121244294a261833d500cc8a"},"schema_version":"1.0","source":{"id":"1507.03555","kind":"arxiv","version":5}},"canonical_sha256":"5250fcdd6806d5d1546cdf9d90a2115d8b0c1fbced8a405a875191746be27364","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"5250fcdd6806d5d1546cdf9d90a2115d8b0c1fbced8a405a875191746be27364","first_computed_at":"2026-05-18T01:19:40.773475Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:19:40.773475Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"C1Zt4jVnTbMGEARN+Sm2PFFxHC1fKGZCHsKay/R5DsS0tOJjLiiWj+AGPmC5xgiDUpnAT8tLKGzkoUb2s+bZBw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:19:40.773938Z","signed_message":"canonical_sha256_bytes"},"source_id":"1507.03555","source_kind":"arxiv","source_version":5}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:01e2ea6f0747c67499524241a889439ace65d5f9c92e6ab8258c2e736b2fadde","sha256:a830ce5524bceba5fb53c6029818e95133503a9eabe971f7e93f774f25b07ad4"],"state_sha256":"a902d350a0ac775ff697b567dc156178705373d15b996af4f773407e09da9203"}