{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2008:T4UHYR6YHGKBDCUIK6KDWBDYYO","short_pith_number":"pith:T4UHYR6Y","canonical_record":{"source":{"id":"0811.3006","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2008-11-18T21:25:48Z","cross_cats_sorted":["astro-ph"],"title_canon_sha256":"cdd5371894ae65a7ca3f6523f843af53eff17e4949d94ef8d1b0400d8011c554","abstract_canon_sha256":"5a0d8f8d6a9fd855d2211dd4688dcdac703427dfc709d196372fbd7f0e053e3a"},"schema_version":"1.0"},"canonical_sha256":"9f287c47d83994118a8857943b0478c3a99d525b8c2313e5dc9dad8217281e7e","source":{"kind":"arxiv","id":"0811.3006","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0811.3006","created_at":"2026-05-18T02:15:14Z"},{"alias_kind":"arxiv_version","alias_value":"0811.3006v2","created_at":"2026-05-18T02:15:14Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0811.3006","created_at":"2026-05-18T02:15:14Z"},{"alias_kind":"pith_short_12","alias_value":"T4UHYR6YHGKB","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_16","alias_value":"T4UHYR6YHGKBDCUI","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_8","alias_value":"T4UHYR6Y","created_at":"2026-05-18T12:25:58Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2008:T4UHYR6YHGKBDCUIK6KDWBDYYO","target":"record","payload":{"canonical_record":{"source":{"id":"0811.3006","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2008-11-18T21:25:48Z","cross_cats_sorted":["astro-ph"],"title_canon_sha256":"cdd5371894ae65a7ca3f6523f843af53eff17e4949d94ef8d1b0400d8011c554","abstract_canon_sha256":"5a0d8f8d6a9fd855d2211dd4688dcdac703427dfc709d196372fbd7f0e053e3a"},"schema_version":"1.0"},"canonical_sha256":"9f287c47d83994118a8857943b0478c3a99d525b8c2313e5dc9dad8217281e7e","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:15:14.063706Z","signature_b64":"fvmWeKhK5b5IXdSaFDHBbG5MtUVYFiJKfAFwDzCf2ZlBU0jglCasEDzO+ejQnF5dAt6yGFA8afuoesUlilS5Cg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"9f287c47d83994118a8857943b0478c3a99d525b8c2313e5dc9dad8217281e7e","last_reissued_at":"2026-05-18T02:15:14.063057Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:15:14.063057Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0811.3006","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":"2026-05-18T02:15:14Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"/QJ8oMPo8+xZtoIEB0lZtmHHNznZCLQuyYFZISsGB0hJVtLPzhZGHTZBH1P23D+jTtgdkxMWnFBiJqQmVmpWBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-03T01:13:20.511254Z"},"content_sha256":"a97e6e3dc879689d58c314912b7a99b2e10557a8d2a8df741dc61cc8a41bb200","schema_version":"1.0","event_id":"sha256:a97e6e3dc879689d58c314912b7a99b2e10557a8d2a8df741dc61cc8a41bb200"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2008:T4UHYR6YHGKBDCUIK6KDWBDYYO","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Algebraic Classification of Numerical Spacetimes and Black-Hole-Binary Remnants","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph"],"primary_cat":"gr-qc","authors_text":"Carlos O. Lousto, Manuela Campanelli, Yosef Zlochower","submitted_at":"2008-11-18T21:25:48Z","abstract_excerpt":"In this paper we develop a technique for determining the algebraic classification of a numerical spacetime, possibly resulting from a generic black-hole-binary merger, using the Newman-Penrose Weyl scalars. We demonstrate these techniques for a test case involving a close binary with arbitrarily oriented spins and unequal masses. We find that, post merger, the spacetime quickly approaches Petrov type II, and only approaches type D on much longer timescales. These techniques allow us to begin to explore the validity of the \"no-hair theorem\" for generic merging-black-hole spacetimes."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0811.3006","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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T02:15:14Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"5U9JA/pZoy7BSNY0da6zLwkmeBGuAbIjoc7E4N+46lyrwpUvR5T+jCkX4PwZYOe2jtoU9ZPAgx5AxXPwcUj5AQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-03T01:13:20.511617Z"},"content_sha256":"9b9f0338dd8d7cc4cea8fd8f112951a3f1e3227cf23fcac2f5a72ceb46b4d5d9","schema_version":"1.0","event_id":"sha256:9b9f0338dd8d7cc4cea8fd8f112951a3f1e3227cf23fcac2f5a72ceb46b4d5d9"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/T4UHYR6YHGKBDCUIK6KDWBDYYO/bundle.json","state_url":"https://pith.science/pith/T4UHYR6YHGKBDCUIK6KDWBDYYO/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/T4UHYR6YHGKBDCUIK6KDWBDYYO/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":"2026-06-03T01:13:20Z","links":{"resolver":"https://pith.science/pith/T4UHYR6YHGKBDCUIK6KDWBDYYO","bundle":"https://pith.science/pith/T4UHYR6YHGKBDCUIK6KDWBDYYO/bundle.json","state":"https://pith.science/pith/T4UHYR6YHGKBDCUIK6KDWBDYYO/state.json","well_known_bundle":"https://pith.science/.well-known/pith/T4UHYR6YHGKBDCUIK6KDWBDYYO/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2008:T4UHYR6YHGKBDCUIK6KDWBDYYO","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":"5a0d8f8d6a9fd855d2211dd4688dcdac703427dfc709d196372fbd7f0e053e3a","cross_cats_sorted":["astro-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2008-11-18T21:25:48Z","title_canon_sha256":"cdd5371894ae65a7ca3f6523f843af53eff17e4949d94ef8d1b0400d8011c554"},"schema_version":"1.0","source":{"id":"0811.3006","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0811.3006","created_at":"2026-05-18T02:15:14Z"},{"alias_kind":"arxiv_version","alias_value":"0811.3006v2","created_at":"2026-05-18T02:15:14Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0811.3006","created_at":"2026-05-18T02:15:14Z"},{"alias_kind":"pith_short_12","alias_value":"T4UHYR6YHGKB","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_16","alias_value":"T4UHYR6YHGKBDCUI","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_8","alias_value":"T4UHYR6Y","created_at":"2026-05-18T12:25:58Z"}],"graph_snapshots":[{"event_id":"sha256:9b9f0338dd8d7cc4cea8fd8f112951a3f1e3227cf23fcac2f5a72ceb46b4d5d9","target":"graph","created_at":"2026-05-18T02:15:14Z","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":"In this paper we develop a technique for determining the algebraic classification of a numerical spacetime, possibly resulting from a generic black-hole-binary merger, using the Newman-Penrose Weyl scalars. We demonstrate these techniques for a test case involving a close binary with arbitrarily oriented spins and unequal masses. We find that, post merger, the spacetime quickly approaches Petrov type II, and only approaches type D on much longer timescales. These techniques allow us to begin to explore the validity of the \"no-hair theorem\" for generic merging-black-hole spacetimes.","authors_text":"Carlos O. Lousto, Manuela Campanelli, Yosef Zlochower","cross_cats":["astro-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2008-11-18T21:25:48Z","title":"Algebraic Classification of Numerical Spacetimes and Black-Hole-Binary Remnants"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0811.3006","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:a97e6e3dc879689d58c314912b7a99b2e10557a8d2a8df741dc61cc8a41bb200","target":"record","created_at":"2026-05-18T02:15:14Z","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":"5a0d8f8d6a9fd855d2211dd4688dcdac703427dfc709d196372fbd7f0e053e3a","cross_cats_sorted":["astro-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2008-11-18T21:25:48Z","title_canon_sha256":"cdd5371894ae65a7ca3f6523f843af53eff17e4949d94ef8d1b0400d8011c554"},"schema_version":"1.0","source":{"id":"0811.3006","kind":"arxiv","version":2}},"canonical_sha256":"9f287c47d83994118a8857943b0478c3a99d525b8c2313e5dc9dad8217281e7e","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"9f287c47d83994118a8857943b0478c3a99d525b8c2313e5dc9dad8217281e7e","first_computed_at":"2026-05-18T02:15:14.063057Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:15:14.063057Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"fvmWeKhK5b5IXdSaFDHBbG5MtUVYFiJKfAFwDzCf2ZlBU0jglCasEDzO+ejQnF5dAt6yGFA8afuoesUlilS5Cg==","signature_status":"signed_v1","signed_at":"2026-05-18T02:15:14.063706Z","signed_message":"canonical_sha256_bytes"},"source_id":"0811.3006","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:a97e6e3dc879689d58c314912b7a99b2e10557a8d2a8df741dc61cc8a41bb200","sha256:9b9f0338dd8d7cc4cea8fd8f112951a3f1e3227cf23fcac2f5a72ceb46b4d5d9"],"state_sha256":"494d1cc05af8c508a992c97a2441296b53bce50e966dcc60c4da1f9e1f75d0f8"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"w6xzT9l8zeWtjhodF1ugs1dIRx1DBKInj47RHyNnubBN35NEOCRQ7eqmq/5BMQhPDpKFxcWfMqAw35/FDbClDw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-03T01:13:20.513545Z","bundle_sha256":"eac7df4d595687965549979779cde7aaadb2bfd4441802da4209e2b0e0822d0f"}}