{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2022:U4MHMBKCWHAVX3KGLLFY7M7J3P","short_pith_number":"pith:U4MHMBKC","canonical_record":{"source":{"id":"2208.05724","kind":"arxiv","version":2},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"hep-ph","submitted_at":"2022-08-11T09:40:50Z","cross_cats_sorted":["astro-ph.HE","gr-qc"],"title_canon_sha256":"325f2348f8b57f0a16b1a856cf117f079d975afa6c6505a2f4f27a294d086060","abstract_canon_sha256":"e1eb02ad05eb3b643bf2696c47fab7671d4b92b3119c56218ee2ce1d5f879b41"},"schema_version":"1.0"},"canonical_sha256":"a718760542b1c15bed465acb8fb3e9dbe75a6ed3d47f4d0441fbc1ad1b2567b9","source":{"kind":"arxiv","id":"2208.05724","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2208.05724","created_at":"2026-07-05T05:01:40Z"},{"alias_kind":"arxiv_version","alias_value":"2208.05724v2","created_at":"2026-07-05T05:01:40Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2208.05724","created_at":"2026-07-05T05:01:40Z"},{"alias_kind":"pith_short_12","alias_value":"U4MHMBKCWHAV","created_at":"2026-07-05T05:01:40Z"},{"alias_kind":"pith_short_16","alias_value":"U4MHMBKCWHAVX3KG","created_at":"2026-07-05T05:01:40Z"},{"alias_kind":"pith_short_8","alias_value":"U4MHMBKC","created_at":"2026-07-05T05:01:40Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2022:U4MHMBKCWHAVX3KGLLFY7M7J3P","target":"record","payload":{"canonical_record":{"source":{"id":"2208.05724","kind":"arxiv","version":2},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"hep-ph","submitted_at":"2022-08-11T09:40:50Z","cross_cats_sorted":["astro-ph.HE","gr-qc"],"title_canon_sha256":"325f2348f8b57f0a16b1a856cf117f079d975afa6c6505a2f4f27a294d086060","abstract_canon_sha256":"e1eb02ad05eb3b643bf2696c47fab7671d4b92b3119c56218ee2ce1d5f879b41"},"schema_version":"1.0"},"canonical_sha256":"a718760542b1c15bed465acb8fb3e9dbe75a6ed3d47f4d0441fbc1ad1b2567b9","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T05:01:40.374792Z","signature_b64":"+FyYVeCAnAKIs3l8kP+XzdWw947VWjxH5x9vz0htXAtqQJUfANGf2WJPHTTNXyQZp/ea2jIl8ORXj23X3pNCBw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"a718760542b1c15bed465acb8fb3e9dbe75a6ed3d47f4d0441fbc1ad1b2567b9","last_reissued_at":"2026-07-05T05:01:40.374266Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T05:01:40.374266Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2208.05724","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T05:01:40Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"5nhwyKMm4jIAvVnUqhyQiqpol8Ri+OCOHn0wuvfbMR709xiQPZfPVJSnCG0hQvqay/NLd11QsGxm8dS5IuaFDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-11T06:13:33.123475Z"},"content_sha256":"0e421c4bbc91b91c2e99381f4f580ad42c4f2294ac1708dc6653366bb8783aad","schema_version":"1.0","event_id":"sha256:0e421c4bbc91b91c2e99381f4f580ad42c4f2294ac1708dc6653366bb8783aad"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2022:U4MHMBKCWHAVX3KGLLFY7M7J3P","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Birefringence Tomography for Axion Cloud","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["astro-ph.HE","gr-qc"],"primary_cat":"hep-ph","authors_text":"Chunlong Li, Jing Shu, Qiang Yuan, Xiao Xue, Yifan Chen, Yosuke Mizuno, Yue Zhao, Zihan Zhou","submitted_at":"2022-08-11T09:40:50Z","abstract_excerpt":"An axion cloud surrounding a supermassive black hole can be naturally produced through the superradiance process. Its existence can be examined by the axion induced birefringence effect. It predicts an oscillation of the electric vector position angle of linearly polarized radiations. Stringent constraints of the existence of the axion in a particular mass window has been obtained based on the recent Event Horizon Telescope measurement on M87$^\\star$. The future Very-Long-Baseline Interferometry (VLBI) observations will be able to measure the vicinity of many supermassive black holes, thus it "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2208.05724","kind":"arxiv","version":2},"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/2208.05724/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":"2026-07-05T05:01:40Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"V2estV13kWr5DJx7+7qZUhxqs+ygT+ZwqHxLLHKDsdca/JmCOgYNgSVd50k85Fpral3ETsBFpGdH1256POWDCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-11T06:13:33.124552Z"},"content_sha256":"1201c691258ab631514a05fc7e9308c013190502cfd199a7989e42db325e85cd","schema_version":"1.0","event_id":"sha256:1201c691258ab631514a05fc7e9308c013190502cfd199a7989e42db325e85cd"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/U4MHMBKCWHAVX3KGLLFY7M7J3P/bundle.json","state_url":"https://pith.science/pith/U4MHMBKCWHAVX3KGLLFY7M7J3P/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/U4MHMBKCWHAVX3KGLLFY7M7J3P/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":"2026-08-11T06:13:33Z","links":{"resolver":"https://pith.science/pith/U4MHMBKCWHAVX3KGLLFY7M7J3P","bundle":"https://pith.science/pith/U4MHMBKCWHAVX3KGLLFY7M7J3P/bundle.json","state":"https://pith.science/pith/U4MHMBKCWHAVX3KGLLFY7M7J3P/state.json","well_known_bundle":"https://pith.science/.well-known/pith/U4MHMBKCWHAVX3KGLLFY7M7J3P/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2022:U4MHMBKCWHAVX3KGLLFY7M7J3P","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":"e1eb02ad05eb3b643bf2696c47fab7671d4b92b3119c56218ee2ce1d5f879b41","cross_cats_sorted":["astro-ph.HE","gr-qc"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"hep-ph","submitted_at":"2022-08-11T09:40:50Z","title_canon_sha256":"325f2348f8b57f0a16b1a856cf117f079d975afa6c6505a2f4f27a294d086060"},"schema_version":"1.0","source":{"id":"2208.05724","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2208.05724","created_at":"2026-07-05T05:01:40Z"},{"alias_kind":"arxiv_version","alias_value":"2208.05724v2","created_at":"2026-07-05T05:01:40Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2208.05724","created_at":"2026-07-05T05:01:40Z"},{"alias_kind":"pith_short_12","alias_value":"U4MHMBKCWHAV","created_at":"2026-07-05T05:01:40Z"},{"alias_kind":"pith_short_16","alias_value":"U4MHMBKCWHAVX3KG","created_at":"2026-07-05T05:01:40Z"},{"alias_kind":"pith_short_8","alias_value":"U4MHMBKC","created_at":"2026-07-05T05:01:40Z"}],"graph_snapshots":[{"event_id":"sha256:1201c691258ab631514a05fc7e9308c013190502cfd199a7989e42db325e85cd","target":"graph","created_at":"2026-07-05T05:01:40Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2208.05724/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"An axion cloud surrounding a supermassive black hole can be naturally produced through the superradiance process. Its existence can be examined by the axion induced birefringence effect. It predicts an oscillation of the electric vector position angle of linearly polarized radiations. Stringent constraints of the existence of the axion in a particular mass window has been obtained based on the recent Event Horizon Telescope measurement on M87$^\\star$. The future Very-Long-Baseline Interferometry (VLBI) observations will be able to measure the vicinity of many supermassive black holes, thus it ","authors_text":"Chunlong Li, Jing Shu, Qiang Yuan, Xiao Xue, Yifan Chen, Yosuke Mizuno, Yue Zhao, Zihan Zhou","cross_cats":["astro-ph.HE","gr-qc"],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"hep-ph","submitted_at":"2022-08-11T09:40:50Z","title":"Birefringence Tomography for Axion Cloud"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2208.05724","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":"sha256:0e421c4bbc91b91c2e99381f4f580ad42c4f2294ac1708dc6653366bb8783aad","target":"record","created_at":"2026-07-05T05:01:40Z","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":"e1eb02ad05eb3b643bf2696c47fab7671d4b92b3119c56218ee2ce1d5f879b41","cross_cats_sorted":["astro-ph.HE","gr-qc"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"hep-ph","submitted_at":"2022-08-11T09:40:50Z","title_canon_sha256":"325f2348f8b57f0a16b1a856cf117f079d975afa6c6505a2f4f27a294d086060"},"schema_version":"1.0","source":{"id":"2208.05724","kind":"arxiv","version":2}},"canonical_sha256":"a718760542b1c15bed465acb8fb3e9dbe75a6ed3d47f4d0441fbc1ad1b2567b9","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"a718760542b1c15bed465acb8fb3e9dbe75a6ed3d47f4d0441fbc1ad1b2567b9","first_computed_at":"2026-07-05T05:01:40.374266Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T05:01:40.374266Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"+FyYVeCAnAKIs3l8kP+XzdWw947VWjxH5x9vz0htXAtqQJUfANGf2WJPHTTNXyQZp/ea2jIl8ORXj23X3pNCBw==","signature_status":"signed_v1","signed_at":"2026-07-05T05:01:40.374792Z","signed_message":"canonical_sha256_bytes"},"source_id":"2208.05724","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:0e421c4bbc91b91c2e99381f4f580ad42c4f2294ac1708dc6653366bb8783aad","sha256:1201c691258ab631514a05fc7e9308c013190502cfd199a7989e42db325e85cd"],"state_sha256":"88e2e138d7665bcc81e2cc30a0da153f526ed7184df00d37e0ad6b21f3c67011"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"unonZbh+2Bga63a96PMlqsAfcH3zhlsr3vB+I6x8jSg+hxojEmS5ESWPsTHJTYXKzevOGbPF4xzPRSEN/SKzAw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-11T06:13:33.131212Z","bundle_sha256":"a21e6937fab5d009111ed96e43a7ae1d3209dad8ca2c95f65c0ad8d18d7b2fb9"}}