{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:7MDHK4EECZWIHDVOOBX4JI7UBM","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":"710863896e8a71f667ad3d96d5913692ee4a1f2f71da7fc77e35eb62aad9b4fd","cross_cats_sorted":["hep-th"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2018-12-07T13:06:25Z","title_canon_sha256":"229e4c69c93344fffeb00c867308ad7c01159225a423ed1a145ef8aa53c11a10"},"schema_version":"1.0","source":{"id":"1812.03014","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1812.03014","created_at":"2026-05-17T23:41:30Z"},{"alias_kind":"arxiv_version","alias_value":"1812.03014v2","created_at":"2026-05-17T23:41:30Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1812.03014","created_at":"2026-05-17T23:41:30Z"},{"alias_kind":"pith_short_12","alias_value":"7MDHK4EECZWI","created_at":"2026-05-18T12:32:11Z"},{"alias_kind":"pith_short_16","alias_value":"7MDHK4EECZWIHDVO","created_at":"2026-05-18T12:32:11Z"},{"alias_kind":"pith_short_8","alias_value":"7MDHK4EE","created_at":"2026-05-18T12:32:11Z"}],"graph_snapshots":[{"event_id":"sha256:8fdab8ecb173f3aeb72dae0edc6e7a41669154c616cd7cef172aeb59c10e5e4a","target":"graph","created_at":"2026-05-17T23:41:30Z","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 compute the gravitational birefringence of light as it undergoes gravitational lensing. To this end we re-derive the Souriau-Saturnini equations in the Schwarzschild metric and solve them numerically and perturbatively. Our main result is an offset between the trajectories of the photons of opposite polarisations, which grows with time. We also find an intriguing instability of the spin component transverse to the momentum.","authors_text":"Christian Duval, Loic Marsot, Thomas Schucker","cross_cats":["hep-th"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2018-12-07T13:06:25Z","title":"Gravitational birefringence of light in Schwarzschild spacetime"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1812.03014","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":"sha256:4cb256f0946b167a6e007d3c7e61b82c60acee40d5ac4b7e80bd52ca2c5c8d06","target":"record","created_at":"2026-05-17T23:41:30Z","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":"710863896e8a71f667ad3d96d5913692ee4a1f2f71da7fc77e35eb62aad9b4fd","cross_cats_sorted":["hep-th"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2018-12-07T13:06:25Z","title_canon_sha256":"229e4c69c93344fffeb00c867308ad7c01159225a423ed1a145ef8aa53c11a10"},"schema_version":"1.0","source":{"id":"1812.03014","kind":"arxiv","version":2}},"canonical_sha256":"fb06757084166c838eae706fc4a3f40b32ec339c2a6b5c465b290969eee5b282","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"fb06757084166c838eae706fc4a3f40b32ec339c2a6b5c465b290969eee5b282","first_computed_at":"2026-05-17T23:41:30.814718Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:41:30.814718Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"5RtWHI6OmorsYdqSTv0y+TQbCTLgOz6HWMOWNpWlKGrgGAg81w6jDD8X8cZfbQXxN9s32eNFIXeKdyyTl4QkCQ==","signature_status":"signed_v1","signed_at":"2026-05-17T23:41:30.815602Z","signed_message":"canonical_sha256_bytes"},"source_id":"1812.03014","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:4cb256f0946b167a6e007d3c7e61b82c60acee40d5ac4b7e80bd52ca2c5c8d06","sha256:8fdab8ecb173f3aeb72dae0edc6e7a41669154c616cd7cef172aeb59c10e5e4a"],"state_sha256":"92ada4466c6e8a11db7796334853b9c99866ed53ab9ff6b1105c7744904f359c"}