{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:K5AGTMYM354HVP7Y4FJFA6B7Z3","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":"8c7ce08e58816a82f1c66def50ee244bfbbfba50b4d939e68ed3d45f243f4194","cross_cats_sorted":["astro-ph.HE","hep-th"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2015-05-15T20:00:17Z","title_canon_sha256":"cdb7d208a306c97171699f08b85aabf2c57aef5c26e95d21105410781bd0c13e"},"schema_version":"1.0","source":{"id":"1505.04189","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1505.04189","created_at":"2026-05-18T01:25:00Z"},{"alias_kind":"arxiv_version","alias_value":"1505.04189v1","created_at":"2026-05-18T01:25:00Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1505.04189","created_at":"2026-05-18T01:25:00Z"},{"alias_kind":"pith_short_12","alias_value":"K5AGTMYM354H","created_at":"2026-05-18T12:29:27Z"},{"alias_kind":"pith_short_16","alias_value":"K5AGTMYM354HVP7Y","created_at":"2026-05-18T12:29:27Z"},{"alias_kind":"pith_short_8","alias_value":"K5AGTMYM","created_at":"2026-05-18T12:29:27Z"}],"graph_snapshots":[{"event_id":"sha256:545f109a4ce9d57ccedc505d707ea4cd8a13c1b345434759cca0ea1722ddb77d","target":"graph","created_at":"2026-05-18T01:25:00Z","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"},"paper":{"abstract_excerpt":"Kerr black holes have their angular momentum, $J$, bounded by their mass, $M$: $Jc\\leqslant GM^2$. There are, however, known black hole solutions violating this Kerr bound. We propose a very simple universal bound on the rotation, rather than on the angular momentum, of four-dimensional, stationary and axisymmetric, asymptotically flat black holes, given in terms of an appropriately defined horizon linear velocity, $v_H$. The $v_H$ bound is simply that $v_H$ cannot exceed the velocity of light. We verify the $v_H$ bound for known black hole solutions, including some that violate the Kerr bound","authors_text":"Carlos A. R. Herdeiro, Eugen Radu","cross_cats":["astro-ph.HE","hep-th"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2015-05-15T20:00:17Z","title":"How fast can a black hole rotate?"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1505.04189","kind":"arxiv","version":1},"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:b2272b336ad9391310ec3d201dd81878c07de602b0eeedd88daa13c784decff8","target":"record","created_at":"2026-05-18T01:25:00Z","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":"8c7ce08e58816a82f1c66def50ee244bfbbfba50b4d939e68ed3d45f243f4194","cross_cats_sorted":["astro-ph.HE","hep-th"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2015-05-15T20:00:17Z","title_canon_sha256":"cdb7d208a306c97171699f08b85aabf2c57aef5c26e95d21105410781bd0c13e"},"schema_version":"1.0","source":{"id":"1505.04189","kind":"arxiv","version":1}},"canonical_sha256":"574069b30cdf787abff8e15250783fcefe448ed34a46b476a61b954088138f49","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"574069b30cdf787abff8e15250783fcefe448ed34a46b476a61b954088138f49","first_computed_at":"2026-05-18T01:25:00.405680Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:25:00.405680Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Tdz5Gr4JKJ7kMwUjNUGp/0bi8NN22zE11YLPkm/bdG9/llL0ukGAcEdELyAfXLFwGIauoFbDYVx5b9eLLq2YAQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:25:00.406372Z","signed_message":"canonical_sha256_bytes"},"source_id":"1505.04189","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:b2272b336ad9391310ec3d201dd81878c07de602b0eeedd88daa13c784decff8","sha256:545f109a4ce9d57ccedc505d707ea4cd8a13c1b345434759cca0ea1722ddb77d"],"state_sha256":"8302d214bfd56957f3030cfeb30fee049675c488de44f3352481ee41470dd24b"}