{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2020:Z4P5KR6PXAYUOUB7NYVWUTQPLZ","short_pith_number":"pith:Z4P5KR6P","canonical_record":{"source":{"id":"2004.08857","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2020-04-19T14:06:28Z","cross_cats_sorted":[],"title_canon_sha256":"c4661b02d7fb80cb03d931be05cd6761ef68d4eef33b439ea92498ddb22d7ad4","abstract_canon_sha256":"17654980a015a026491a387500b4319ff9c485832216083c996e6e5399b1f6b6"},"schema_version":"1.0"},"canonical_sha256":"cf1fd547cfb83147503f6e2b6a4e0f5e4586659bf3084d237f0cea943d2bbf05","source":{"kind":"arxiv","id":"2004.08857","version":3},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2004.08857","created_at":"2026-07-05T01:23:12Z"},{"alias_kind":"arxiv_version","alias_value":"2004.08857v3","created_at":"2026-07-05T01:23:12Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2004.08857","created_at":"2026-07-05T01:23:12Z"},{"alias_kind":"pith_short_12","alias_value":"Z4P5KR6PXAYU","created_at":"2026-07-05T01:23:12Z"},{"alias_kind":"pith_short_16","alias_value":"Z4P5KR6PXAYUOUB7","created_at":"2026-07-05T01:23:12Z"},{"alias_kind":"pith_short_8","alias_value":"Z4P5KR6P","created_at":"2026-07-05T01:23:12Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2020:Z4P5KR6PXAYUOUB7NYVWUTQPLZ","target":"record","payload":{"canonical_record":{"source":{"id":"2004.08857","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2020-04-19T14:06:28Z","cross_cats_sorted":[],"title_canon_sha256":"c4661b02d7fb80cb03d931be05cd6761ef68d4eef33b439ea92498ddb22d7ad4","abstract_canon_sha256":"17654980a015a026491a387500b4319ff9c485832216083c996e6e5399b1f6b6"},"schema_version":"1.0"},"canonical_sha256":"cf1fd547cfb83147503f6e2b6a4e0f5e4586659bf3084d237f0cea943d2bbf05","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T01:23:12.069373Z","signature_b64":"MNFTLs4D7AVEKeweTgGscHWIwcPUJFXLUUmsqXHLej34tRWDyJPGhkNcPZ5FxlHArbUA3rRft2zzl9AgmY9DBg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"cf1fd547cfb83147503f6e2b6a4e0f5e4586659bf3084d237f0cea943d2bbf05","last_reissued_at":"2026-07-05T01:23:12.068910Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T01:23:12.068910Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2004.08857","source_version":3,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T01:23:12Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"bhtmUGheoSoCPZDL6Kyma+2xwU5eXr4OK7Ua3XHRq1uN0Q747S7GsJDqu+tJgL1mFTlP6enD8EPkVtk3SEKjDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-16T17:50:45.448157Z"},"content_sha256":"3656b4c7ffe380613e03d7bde665f80df48e3f563210a31553780f03afb1e95f","schema_version":"1.0","event_id":"sha256:3656b4c7ffe380613e03d7bde665f80df48e3f563210a31553780f03afb1e95f"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2020:Z4P5KR6PXAYUOUB7NYVWUTQPLZ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Polarization effects in Kerr black hole shadow due to the coupling between photon and bumblebee field","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"gr-qc","authors_text":"Jiliang Jing, Mingzhi Wang, Songbai Chen","submitted_at":"2020-04-19T14:06:28Z","abstract_excerpt":"We present firstly the equation of motion for the photon coupled to a special bumblebee vector field in a Kerr black hole spacetime and find that the propagation of light depends on its polarization due to the birefringence phenomenon. The dependence of black hole shadow on the light's polarization is dominated by the rotation of black hole. In the non-rotating case, we find that the black hole shadow is independent of the polarization of light. However, the status is changed in the rotating case, in which the black hole shadow depends on the light's polarization and the coupling between bumbl"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2004.08857","kind":"arxiv","version":3},"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/2004.08857/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":"2026-07-05T01:23:12Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"g0M7Xr+GZTpic+/M/u2c2FfsVpk53MqxOLAEsitDGTMoVfnKMsEiLFHyV+qWmqEE8WN8Z27QS8jmmwIojR6xAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-16T17:50:45.448657Z"},"content_sha256":"9af2e96df59b2875878a120cf26be6a62282e00576883e13b86f985f7c6fa033","schema_version":"1.0","event_id":"sha256:9af2e96df59b2875878a120cf26be6a62282e00576883e13b86f985f7c6fa033"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/Z4P5KR6PXAYUOUB7NYVWUTQPLZ/bundle.json","state_url":"https://pith.science/pith/Z4P5KR6PXAYUOUB7NYVWUTQPLZ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/Z4P5KR6PXAYUOUB7NYVWUTQPLZ/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":"2026-08-16T17:50:45Z","links":{"resolver":"https://pith.science/pith/Z4P5KR6PXAYUOUB7NYVWUTQPLZ","bundle":"https://pith.science/pith/Z4P5KR6PXAYUOUB7NYVWUTQPLZ/bundle.json","state":"https://pith.science/pith/Z4P5KR6PXAYUOUB7NYVWUTQPLZ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/Z4P5KR6PXAYUOUB7NYVWUTQPLZ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2020:Z4P5KR6PXAYUOUB7NYVWUTQPLZ","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":"17654980a015a026491a387500b4319ff9c485832216083c996e6e5399b1f6b6","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2020-04-19T14:06:28Z","title_canon_sha256":"c4661b02d7fb80cb03d931be05cd6761ef68d4eef33b439ea92498ddb22d7ad4"},"schema_version":"1.0","source":{"id":"2004.08857","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2004.08857","created_at":"2026-07-05T01:23:12Z"},{"alias_kind":"arxiv_version","alias_value":"2004.08857v3","created_at":"2026-07-05T01:23:12Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2004.08857","created_at":"2026-07-05T01:23:12Z"},{"alias_kind":"pith_short_12","alias_value":"Z4P5KR6PXAYU","created_at":"2026-07-05T01:23:12Z"},{"alias_kind":"pith_short_16","alias_value":"Z4P5KR6PXAYUOUB7","created_at":"2026-07-05T01:23:12Z"},{"alias_kind":"pith_short_8","alias_value":"Z4P5KR6P","created_at":"2026-07-05T01:23:12Z"}],"graph_snapshots":[{"event_id":"sha256:9af2e96df59b2875878a120cf26be6a62282e00576883e13b86f985f7c6fa033","target":"graph","created_at":"2026-07-05T01:23:12Z","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/2004.08857/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We present firstly the equation of motion for the photon coupled to a special bumblebee vector field in a Kerr black hole spacetime and find that the propagation of light depends on its polarization due to the birefringence phenomenon. The dependence of black hole shadow on the light's polarization is dominated by the rotation of black hole. In the non-rotating case, we find that the black hole shadow is independent of the polarization of light. However, the status is changed in the rotating case, in which the black hole shadow depends on the light's polarization and the coupling between bumbl","authors_text":"Jiliang Jing, Mingzhi Wang, Songbai Chen","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2020-04-19T14:06:28Z","title":"Polarization effects in Kerr black hole shadow due to the coupling between photon and bumblebee field"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2004.08857","kind":"arxiv","version":3},"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":"sha256:3656b4c7ffe380613e03d7bde665f80df48e3f563210a31553780f03afb1e95f","target":"record","created_at":"2026-07-05T01:23:12Z","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":"17654980a015a026491a387500b4319ff9c485832216083c996e6e5399b1f6b6","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2020-04-19T14:06:28Z","title_canon_sha256":"c4661b02d7fb80cb03d931be05cd6761ef68d4eef33b439ea92498ddb22d7ad4"},"schema_version":"1.0","source":{"id":"2004.08857","kind":"arxiv","version":3}},"canonical_sha256":"cf1fd547cfb83147503f6e2b6a4e0f5e4586659bf3084d237f0cea943d2bbf05","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"cf1fd547cfb83147503f6e2b6a4e0f5e4586659bf3084d237f0cea943d2bbf05","first_computed_at":"2026-07-05T01:23:12.068910Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T01:23:12.068910Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"MNFTLs4D7AVEKeweTgGscHWIwcPUJFXLUUmsqXHLej34tRWDyJPGhkNcPZ5FxlHArbUA3rRft2zzl9AgmY9DBg==","signature_status":"signed_v1","signed_at":"2026-07-05T01:23:12.069373Z","signed_message":"canonical_sha256_bytes"},"source_id":"2004.08857","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:3656b4c7ffe380613e03d7bde665f80df48e3f563210a31553780f03afb1e95f","sha256:9af2e96df59b2875878a120cf26be6a62282e00576883e13b86f985f7c6fa033"],"state_sha256":"dbf1621e444f5140f1023139b7a8e0340cdc1969e3d797c6001a72a1f51b7a81"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"EkOKY6x3gGSd+fW7xbaiSbsagWT73jRI2SkA3jF2M4e5AY/KCNcj6xfV+lHEdlJS18jzafxqzmw4ES2V9bCABw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-16T17:50:45.453205Z","bundle_sha256":"98510fc14b772f8410d31a00e4a8e1063e0422fc166b823abd7832b050eb1dab"}}