{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2011:FAKW7LRTEN4PKE2KDUKTKXCXCQ","short_pith_number":"pith:FAKW7LRT","schema_version":"1.0","canonical_sha256":"28156fae332378f5134a1d15355c57141c02f5d8b9b33b32f5b553a1a8cacbdd","source":{"kind":"arxiv","id":"1110.0687","version":2},"attestation_state":"computed","paper":{"title":"Can we constrain the maximum value for the spin parameter of the super-massive objects in galactic nuclei without knowing their actual nature?","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.HE"],"primary_cat":"gr-qc","authors_text":"Cosimo Bambi","submitted_at":"2011-10-04T13:55:58Z","abstract_excerpt":"In 4-dimensional General Relativity, black holes are described by the Kerr solution and are subject to the bound $|a_*| \\le 1$, where $a_*$ is the black hole spin parameter. If current black hole candidates are not the black holes predicted in General Relativity, this bound does not hold and $a_*$ might exceed 1. In this letter, I relax the Kerr black hole hypothesis and I find that the value of the spin parameter of the super-massive black hole candidates in galactic nuclei cannot be higher than about 1.2. A higher spin parameter would not be consistent with a radiative efficiency $\\eta > 0.1"},"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":"1110.0687","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2011-10-04T13:55:58Z","cross_cats_sorted":["astro-ph.HE"],"title_canon_sha256":"79b26beb4bac9e46b9aee455fe8916f2089c5fd59db122cc42235377efcd0a95","abstract_canon_sha256":"c8df7b31cb0533093e3195ad114ed2a8a54ce782ebc17768db0e326306634de5"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T03:58:26.329268Z","signature_b64":"7MJNK9YoYeyYgyyhWPM0fOw6CeYkh/IOeeV3NluhR7hJiVg4fFzC7iIN4MuGdOVWPQiMVOrf6qxZWqmGj1XADQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"28156fae332378f5134a1d15355c57141c02f5d8b9b33b32f5b553a1a8cacbdd","last_reissued_at":"2026-05-18T03:58:26.328467Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T03:58:26.328467Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Can we constrain the maximum value for the spin parameter of the super-massive objects in galactic nuclei without knowing their actual nature?","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.HE"],"primary_cat":"gr-qc","authors_text":"Cosimo Bambi","submitted_at":"2011-10-04T13:55:58Z","abstract_excerpt":"In 4-dimensional General Relativity, black holes are described by the Kerr solution and are subject to the bound $|a_*| \\le 1$, where $a_*$ is the black hole spin parameter. If current black hole candidates are not the black holes predicted in General Relativity, this bound does not hold and $a_*$ might exceed 1. In this letter, I relax the Kerr black hole hypothesis and I find that the value of the spin parameter of the super-massive black hole candidates in galactic nuclei cannot be higher than about 1.2. A higher spin parameter would not be consistent with a radiative efficiency $\\eta > 0.1"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1110.0687","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":""},"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":"1110.0687","created_at":"2026-05-18T03:58:26.328606+00:00"},{"alias_kind":"arxiv_version","alias_value":"1110.0687v2","created_at":"2026-05-18T03:58:26.328606+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1110.0687","created_at":"2026-05-18T03:58:26.328606+00:00"},{"alias_kind":"pith_short_12","alias_value":"FAKW7LRTEN4P","created_at":"2026-05-18T12:26:28.662955+00:00"},{"alias_kind":"pith_short_16","alias_value":"FAKW7LRTEN4PKE2K","created_at":"2026-05-18T12:26:28.662955+00:00"},{"alias_kind":"pith_short_8","alias_value":"FAKW7LRT","created_at":"2026-05-18T12:26:28.662955+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/FAKW7LRTEN4PKE2KDUKTKXCXCQ","json":"https://pith.science/pith/FAKW7LRTEN4PKE2KDUKTKXCXCQ.json","graph_json":"https://pith.science/api/pith-number/FAKW7LRTEN4PKE2KDUKTKXCXCQ/graph.json","events_json":"https://pith.science/api/pith-number/FAKW7LRTEN4PKE2KDUKTKXCXCQ/events.json","paper":"https://pith.science/paper/FAKW7LRT"},"agent_actions":{"view_html":"https://pith.science/pith/FAKW7LRTEN4PKE2KDUKTKXCXCQ","download_json":"https://pith.science/pith/FAKW7LRTEN4PKE2KDUKTKXCXCQ.json","view_paper":"https://pith.science/paper/FAKW7LRT","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1110.0687&json=true","fetch_graph":"https://pith.science/api/pith-number/FAKW7LRTEN4PKE2KDUKTKXCXCQ/graph.json","fetch_events":"https://pith.science/api/pith-number/FAKW7LRTEN4PKE2KDUKTKXCXCQ/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/FAKW7LRTEN4PKE2KDUKTKXCXCQ/action/timestamp_anchor","attest_storage":"https://pith.science/pith/FAKW7LRTEN4PKE2KDUKTKXCXCQ/action/storage_attestation","attest_author":"https://pith.science/pith/FAKW7LRTEN4PKE2KDUKTKXCXCQ/action/author_attestation","sign_citation":"https://pith.science/pith/FAKW7LRTEN4PKE2KDUKTKXCXCQ/action/citation_signature","submit_replication":"https://pith.science/pith/FAKW7LRTEN4PKE2KDUKTKXCXCQ/action/replication_record"}},"created_at":"2026-05-18T03:58:26.328606+00:00","updated_at":"2026-05-18T03:58:26.328606+00:00"}