{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2024:PU4DM6VRHMTXEX6QPRDEFMHVOG","short_pith_number":"pith:PU4DM6VR","schema_version":"1.0","canonical_sha256":"7d38367ab13b27725fd07c4642b0f571b0c7bd699823e000351d2a952149c01f","source":{"kind":"arxiv","id":"2408.00245","version":2},"attestation_state":"computed","paper":{"title":"Measuring the Spin of the Galactic Center Supermassive Black Hole with Two Pulsars","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["gr-qc"],"primary_cat":"astro-ph.HE","authors_text":"Lijing Shao, Zexin Hu","submitted_at":"2024-08-01T02:51:04Z","abstract_excerpt":"As a key science project of the Square Kilometre Array (SKA), the discovery and timing observations of radio pulsars in the Galactic Center would provide high-precision measurements of the spacetime around the supermassive black hole, Sagittarius A* (Sgr A*), and initiate novel tests of general relativity. The spin of Sgr A* could be measured with a relative error of $\\lesssim 1\\%$ by timing one pulsar with timing precision that is achievable for the SKA. However, the real measurements depend on the discovery of a pulsar in a very compact orbit, $P_b\\lesssim0.5\\,{\\rm yr}$. Here for the first t"},"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":"2408.00245","kind":"arxiv","version":2},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2024-08-01T02:51:04Z","cross_cats_sorted":["gr-qc"],"title_canon_sha256":"143690de61003fa068ec18e8a9dd4f1533cc799e4b8be21f21b0518289618533","abstract_canon_sha256":"074c0a9af0a9c0c7334222f746d238a50ebc31093b5688f26a8597063fc5d043"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T09:45:13.064938Z","signature_b64":"Def7HnMHmBLfEe3Z4eH4vyfmUhzy0X6Y3zOv+VCjr03y/a7vZBiYIok8wLVRPd3FmQ4FcX1SGwQoITnAAI+kDA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"7d38367ab13b27725fd07c4642b0f571b0c7bd699823e000351d2a952149c01f","last_reissued_at":"2026-07-05T09:45:13.064442Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T09:45:13.064442Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Measuring the Spin of the Galactic Center Supermassive Black Hole with Two Pulsars","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["gr-qc"],"primary_cat":"astro-ph.HE","authors_text":"Lijing Shao, Zexin Hu","submitted_at":"2024-08-01T02:51:04Z","abstract_excerpt":"As a key science project of the Square Kilometre Array (SKA), the discovery and timing observations of radio pulsars in the Galactic Center would provide high-precision measurements of the spacetime around the supermassive black hole, Sagittarius A* (Sgr A*), and initiate novel tests of general relativity. The spin of Sgr A* could be measured with a relative error of $\\lesssim 1\\%$ by timing one pulsar with timing precision that is achievable for the SKA. However, the real measurements depend on the discovery of a pulsar in a very compact orbit, $P_b\\lesssim0.5\\,{\\rm yr}$. Here for the first t"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2408.00245","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/2408.00245/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":"2408.00245","created_at":"2026-07-05T09:45:13.064497+00:00"},{"alias_kind":"arxiv_version","alias_value":"2408.00245v2","created_at":"2026-07-05T09:45:13.064497+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2408.00245","created_at":"2026-07-05T09:45:13.064497+00:00"},{"alias_kind":"pith_short_12","alias_value":"PU4DM6VRHMTX","created_at":"2026-07-05T09:45:13.064497+00:00"},{"alias_kind":"pith_short_16","alias_value":"PU4DM6VRHMTXEX6Q","created_at":"2026-07-05T09:45:13.064497+00:00"},{"alias_kind":"pith_short_8","alias_value":"PU4DM6VR","created_at":"2026-07-05T09:45:13.064497+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":1,"internal_anchor_count":1,"sample":[{"citing_arxiv_id":"2607.03078","citing_title":"Galactic Centre Pulsars with the SKAO","ref_index":15,"is_internal_anchor":true}]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/PU4DM6VRHMTXEX6QPRDEFMHVOG","json":"https://pith.science/pith/PU4DM6VRHMTXEX6QPRDEFMHVOG.json","graph_json":"https://pith.science/api/pith-number/PU4DM6VRHMTXEX6QPRDEFMHVOG/graph.json","events_json":"https://pith.science/api/pith-number/PU4DM6VRHMTXEX6QPRDEFMHVOG/events.json","paper":"https://pith.science/paper/PU4DM6VR"},"agent_actions":{"view_html":"https://pith.science/pith/PU4DM6VRHMTXEX6QPRDEFMHVOG","download_json":"https://pith.science/pith/PU4DM6VRHMTXEX6QPRDEFMHVOG.json","view_paper":"https://pith.science/paper/PU4DM6VR","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=2408.00245&json=true","fetch_graph":"https://pith.science/api/pith-number/PU4DM6VRHMTXEX6QPRDEFMHVOG/graph.json","fetch_events":"https://pith.science/api/pith-number/PU4DM6VRHMTXEX6QPRDEFMHVOG/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/PU4DM6VRHMTXEX6QPRDEFMHVOG/action/timestamp_anchor","attest_storage":"https://pith.science/pith/PU4DM6VRHMTXEX6QPRDEFMHVOG/action/storage_attestation","attest_author":"https://pith.science/pith/PU4DM6VRHMTXEX6QPRDEFMHVOG/action/author_attestation","sign_citation":"https://pith.science/pith/PU4DM6VRHMTXEX6QPRDEFMHVOG/action/citation_signature","submit_replication":"https://pith.science/pith/PU4DM6VRHMTXEX6QPRDEFMHVOG/action/replication_record"}},"created_at":"2026-07-05T09:45:13.064497+00:00","updated_at":"2026-07-05T09:45:13.064497+00:00"}