{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2026:GCDBOBGR2WMYTTY7TBTR5XFOPW","short_pith_number":"pith:GCDBOBGR","schema_version":"1.0","canonical_sha256":"30861704d1d59989cf1f98671edcae7d8ff462691420dac79417a521c9484902","source":{"kind":"arxiv","id":"2607.14218","version":1},"attestation_state":"computed","paper":{"title":"Signatures of Black Hole Spin in Horizon-Scale Polarimetry","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"Andrew Chael, Daniel C. M. Palumbo, George N. Wong, Zachary Gelles","submitted_at":"2026-07-15T18:00:26Z","abstract_excerpt":"The angular momentum of a black hole, usually expressed in terms of a dimensionless \"spin,\" both shapes the strong-field spacetime and provides a reservoir of rotational energy that can be exchanged with surrounding plasma. Very long baseline interferometry (VLBI) has now begun to resolve polarized emission on event-horizon scales. We distinguish polarimetric signatures of spin arising primarily from photon propagation in the Kerr spacetime from those mediated by horizon-threading electromagnetic fields and magnetized plasma dynamics. We trace the inference from VLBI correlations through Stoke"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"2607.14218","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2026-07-15T18:00:26Z","cross_cats_sorted":[],"title_canon_sha256":"056dfab83b4881295c26627184da003a43a6d4aea2715de1a02444deccd19e53","abstract_canon_sha256":"19e0ad4d61538355e3be432765024a046f77467498d2a04eeb41d8495c835568"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-17T00:20:58.756272Z","signature_b64":"7rXWyZHkNJkDWHABpqKqyaCjUdM9L2VUEVqvn6PFQ+80Wi5VHuSm8+VrK5JvWz+k2N4ZYnJOgYpFxocumJOkBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"30861704d1d59989cf1f98671edcae7d8ff462691420dac79417a521c9484902","last_reissued_at":"2026-07-17T00:20:58.755361Z","signature_status":"signed_v1","first_computed_at":"2026-07-17T00:20:58.755361Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Signatures of Black Hole Spin in Horizon-Scale Polarimetry","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"Andrew Chael, Daniel C. M. Palumbo, George N. Wong, Zachary Gelles","submitted_at":"2026-07-15T18:00:26Z","abstract_excerpt":"The angular momentum of a black hole, usually expressed in terms of a dimensionless \"spin,\" both shapes the strong-field spacetime and provides a reservoir of rotational energy that can be exchanged with surrounding plasma. Very long baseline interferometry (VLBI) has now begun to resolve polarized emission on event-horizon scales. We distinguish polarimetric signatures of spin arising primarily from photon propagation in the Kerr spacetime from those mediated by horizon-threading electromagnetic fields and magnetized plasma dynamics. We trace the inference from VLBI correlations through Stoke"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2607.14218","kind":"arxiv","version":1},"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/2607.14218/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"},"aliases":[{"alias_kind":"arxiv","alias_value":"2607.14218","created_at":"2026-07-17T00:20:58.755805+00:00"},{"alias_kind":"arxiv_version","alias_value":"2607.14218v1","created_at":"2026-07-17T00:20:58.755805+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2607.14218","created_at":"2026-07-17T00:20:58.755805+00:00"},{"alias_kind":"pith_short_12","alias_value":"GCDBOBGR2WMY","created_at":"2026-07-17T00:20:58.755805+00:00"},{"alias_kind":"pith_short_16","alias_value":"GCDBOBGR2WMYTTY7","created_at":"2026-07-17T00:20:58.755805+00:00"},{"alias_kind":"pith_short_8","alias_value":"GCDBOBGR","created_at":"2026-07-17T00:20:58.755805+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/GCDBOBGR2WMYTTY7TBTR5XFOPW","json":"https://pith.science/pith/GCDBOBGR2WMYTTY7TBTR5XFOPW.json","graph_json":"https://pith.science/api/pith-number/GCDBOBGR2WMYTTY7TBTR5XFOPW/graph.json","events_json":"https://pith.science/api/pith-number/GCDBOBGR2WMYTTY7TBTR5XFOPW/events.json","paper":"https://pith.science/paper/GCDBOBGR"},"agent_actions":{"view_html":"https://pith.science/pith/GCDBOBGR2WMYTTY7TBTR5XFOPW","download_json":"https://pith.science/pith/GCDBOBGR2WMYTTY7TBTR5XFOPW.json","view_paper":"https://pith.science/paper/GCDBOBGR","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=2607.14218&json=true","fetch_graph":"https://pith.science/api/pith-number/GCDBOBGR2WMYTTY7TBTR5XFOPW/graph.json","fetch_events":"https://pith.science/api/pith-number/GCDBOBGR2WMYTTY7TBTR5XFOPW/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/GCDBOBGR2WMYTTY7TBTR5XFOPW/action/timestamp_anchor","attest_storage":"https://pith.science/pith/GCDBOBGR2WMYTTY7TBTR5XFOPW/action/storage_attestation","attest_author":"https://pith.science/pith/GCDBOBGR2WMYTTY7TBTR5XFOPW/action/author_attestation","sign_citation":"https://pith.science/pith/GCDBOBGR2WMYTTY7TBTR5XFOPW/action/citation_signature","submit_replication":"https://pith.science/pith/GCDBOBGR2WMYTTY7TBTR5XFOPW/action/replication_record"}},"created_at":"2026-07-17T00:20:58.755805+00:00","updated_at":"2026-07-17T00:20:58.755805+00:00"}