{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:5O3FPYQ43ZBBGY6YK2LSQC6IEG","short_pith_number":"pith:5O3FPYQ4","canonical_record":{"source":{"id":"1909.08039","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2019-09-17T19:14:36Z","cross_cats_sorted":["astro-ph.HE","hep-ph"],"title_canon_sha256":"3bc02a177d98218c8c67d6566a79e7574856dc05e054d4bbc95f204071840d52","abstract_canon_sha256":"3cde1bfc3b8c5992197519b0b27dea0f2284c33c9f161b6373b429dbcd905e3f"},"schema_version":"1.0"},"canonical_sha256":"ebb657e21cde421363d85697280bc82194576bcd81205974eb7cf99bbfe6c4e6","source":{"kind":"arxiv","id":"1909.08039","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1909.08039","created_at":"2026-07-05T00:30:25Z"},{"alias_kind":"arxiv_version","alias_value":"1909.08039v2","created_at":"2026-07-05T00:30:25Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1909.08039","created_at":"2026-07-05T00:30:25Z"},{"alias_kind":"pith_short_12","alias_value":"5O3FPYQ43ZBB","created_at":"2026-07-05T00:30:25Z"},{"alias_kind":"pith_short_16","alias_value":"5O3FPYQ43ZBBGY6Y","created_at":"2026-07-05T00:30:25Z"},{"alias_kind":"pith_short_8","alias_value":"5O3FPYQ4","created_at":"2026-07-05T00:30:25Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:5O3FPYQ43ZBBGY6YK2LSQC6IEG","target":"record","payload":{"canonical_record":{"source":{"id":"1909.08039","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2019-09-17T19:14:36Z","cross_cats_sorted":["astro-ph.HE","hep-ph"],"title_canon_sha256":"3bc02a177d98218c8c67d6566a79e7574856dc05e054d4bbc95f204071840d52","abstract_canon_sha256":"3cde1bfc3b8c5992197519b0b27dea0f2284c33c9f161b6373b429dbcd905e3f"},"schema_version":"1.0"},"canonical_sha256":"ebb657e21cde421363d85697280bc82194576bcd81205974eb7cf99bbfe6c4e6","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T00:30:25.266516Z","signature_b64":"AFeaL3rxnJj5gfr2vkG9NQnp6d+keRISu3IeBHfy9RBlvJ+KmeTh4G2///oOZnu04v1uBDWE47M6fKEKetlPAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"ebb657e21cde421363d85697280bc82194576bcd81205974eb7cf99bbfe6c4e6","last_reissued_at":"2026-07-05T00:30:25.266036Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T00:30:25.266036Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1909.08039","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":"2026-07-05T00:30:25Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"LEeEWposBe3PkbTYl4QztQgcLs3q3PEe5s4Qedt4ckOf7rX7o0vcbLVzvQp13ptGEqTanm9DPnu9Sa4nJSAACQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-14T09:24:57.521619Z"},"content_sha256":"83dba8cd1d08676fb4aa583c85a115323ccc4d6e0339228ac3e1e4009072756d","schema_version":"1.0","event_id":"sha256:83dba8cd1d08676fb4aa583c85a115323ccc4d6e0339228ac3e1e4009072756d"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:5O3FPYQ43ZBBGY6YK2LSQC6IEG","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"EHT constraint on the ultralight scalar hair of the M87 supermassive black hole","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.HE","hep-ph"],"primary_cat":"gr-qc","authors_text":"Carlos A. R. Herdeiro, Eugen Radu, Pedro V.P. Cunha","submitted_at":"2019-09-17T19:14:36Z","abstract_excerpt":"Hypothetical ultralight bosonic fields will spontaneously form macroscopic bosonic halos around Kerr black holes, via superradiance, transferring part of the mass and angular momentum of the black hole into the halo. Such process, however, is only efficient if resonant: when the Compton wavelength of the field approximately matches the gravitational scale of the black hole. For a complex-valued field, the process can form a stationary, bosonic field-black hole equilibrium state - a black hole with synchronised hair. For sufficiently massive black holes, such as the one at the centre of the M87"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1909.08039","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/1909.08039/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":"2026-07-05T00:30:25Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"IldLnvFisrF9ZvTrkyWnC3AsKJoY+7ozYEjpRLEC10t5394wrHXlTwzWqeyKNCzvDeLutMXo1Ybr1/oIPW+eBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-14T09:24:57.521960Z"},"content_sha256":"a5b50845eed1247a34ba077232ac78974abe0012912d4c4c303fe3adfcc37430","schema_version":"1.0","event_id":"sha256:a5b50845eed1247a34ba077232ac78974abe0012912d4c4c303fe3adfcc37430"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/5O3FPYQ43ZBBGY6YK2LSQC6IEG/bundle.json","state_url":"https://pith.science/pith/5O3FPYQ43ZBBGY6YK2LSQC6IEG/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/5O3FPYQ43ZBBGY6YK2LSQC6IEG/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":"2026-08-14T09:24:57Z","links":{"resolver":"https://pith.science/pith/5O3FPYQ43ZBBGY6YK2LSQC6IEG","bundle":"https://pith.science/pith/5O3FPYQ43ZBBGY6YK2LSQC6IEG/bundle.json","state":"https://pith.science/pith/5O3FPYQ43ZBBGY6YK2LSQC6IEG/state.json","well_known_bundle":"https://pith.science/.well-known/pith/5O3FPYQ43ZBBGY6YK2LSQC6IEG/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:5O3FPYQ43ZBBGY6YK2LSQC6IEG","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":"3cde1bfc3b8c5992197519b0b27dea0f2284c33c9f161b6373b429dbcd905e3f","cross_cats_sorted":["astro-ph.HE","hep-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2019-09-17T19:14:36Z","title_canon_sha256":"3bc02a177d98218c8c67d6566a79e7574856dc05e054d4bbc95f204071840d52"},"schema_version":"1.0","source":{"id":"1909.08039","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1909.08039","created_at":"2026-07-05T00:30:25Z"},{"alias_kind":"arxiv_version","alias_value":"1909.08039v2","created_at":"2026-07-05T00:30:25Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1909.08039","created_at":"2026-07-05T00:30:25Z"},{"alias_kind":"pith_short_12","alias_value":"5O3FPYQ43ZBB","created_at":"2026-07-05T00:30:25Z"},{"alias_kind":"pith_short_16","alias_value":"5O3FPYQ43ZBBGY6Y","created_at":"2026-07-05T00:30:25Z"},{"alias_kind":"pith_short_8","alias_value":"5O3FPYQ4","created_at":"2026-07-05T00:30:25Z"}],"graph_snapshots":[{"event_id":"sha256:a5b50845eed1247a34ba077232ac78974abe0012912d4c4c303fe3adfcc37430","target":"graph","created_at":"2026-07-05T00:30:25Z","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/1909.08039/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Hypothetical ultralight bosonic fields will spontaneously form macroscopic bosonic halos around Kerr black holes, via superradiance, transferring part of the mass and angular momentum of the black hole into the halo. Such process, however, is only efficient if resonant: when the Compton wavelength of the field approximately matches the gravitational scale of the black hole. For a complex-valued field, the process can form a stationary, bosonic field-black hole equilibrium state - a black hole with synchronised hair. For sufficiently massive black holes, such as the one at the centre of the M87","authors_text":"Carlos A. R. Herdeiro, Eugen Radu, Pedro V.P. Cunha","cross_cats":["astro-ph.HE","hep-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2019-09-17T19:14:36Z","title":"EHT constraint on the ultralight scalar hair of the M87 supermassive black hole"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1909.08039","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":"sha256:83dba8cd1d08676fb4aa583c85a115323ccc4d6e0339228ac3e1e4009072756d","target":"record","created_at":"2026-07-05T00:30:25Z","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":"3cde1bfc3b8c5992197519b0b27dea0f2284c33c9f161b6373b429dbcd905e3f","cross_cats_sorted":["astro-ph.HE","hep-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2019-09-17T19:14:36Z","title_canon_sha256":"3bc02a177d98218c8c67d6566a79e7574856dc05e054d4bbc95f204071840d52"},"schema_version":"1.0","source":{"id":"1909.08039","kind":"arxiv","version":2}},"canonical_sha256":"ebb657e21cde421363d85697280bc82194576bcd81205974eb7cf99bbfe6c4e6","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"ebb657e21cde421363d85697280bc82194576bcd81205974eb7cf99bbfe6c4e6","first_computed_at":"2026-07-05T00:30:25.266036Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T00:30:25.266036Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"AFeaL3rxnJj5gfr2vkG9NQnp6d+keRISu3IeBHfy9RBlvJ+KmeTh4G2///oOZnu04v1uBDWE47M6fKEKetlPAw==","signature_status":"signed_v1","signed_at":"2026-07-05T00:30:25.266516Z","signed_message":"canonical_sha256_bytes"},"source_id":"1909.08039","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:83dba8cd1d08676fb4aa583c85a115323ccc4d6e0339228ac3e1e4009072756d","sha256:a5b50845eed1247a34ba077232ac78974abe0012912d4c4c303fe3adfcc37430"],"state_sha256":"d2e6723b9cbee0d8067db53c0df71f2bd6d2156d341b5345fd4367458a2ad390"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"lKageboCI5RYxlpOxSxSMpK02j7YOmuJ/1NrmpWF9cRItuyYDDmsclmyjFJViSB39vk8l9YoKv11kkth5WCqDA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-14T09:24:57.525567Z","bundle_sha256":"1a85a1d8f2d76a2fb0e7d4d13890bfe2ccf21da96914a95e07f10abad8b27283"}}