{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:HGN4OK6L6GMGDINZIRZK6KJPCW","short_pith_number":"pith:HGN4OK6L","canonical_record":{"source":{"id":"1909.01373","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2019-09-03T18:00:26Z","cross_cats_sorted":["astro-ph.HE"],"title_canon_sha256":"b0a594f19cf096046188d287ec92549764b64c831d0f58efb56a0a2fc80b1da9","abstract_canon_sha256":"9b4e8296edf08d6e1ea10e0fee648c6ef936f747cba46beb6124d0f9c2a7b94a"},"schema_version":"1.0"},"canonical_sha256":"399bc72bcbf19861a1b94472af292f1588eb1593529368a48d192540d14b6109","source":{"kind":"arxiv","id":"1909.01373","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1909.01373","created_at":"2026-07-05T00:24:55Z"},{"alias_kind":"arxiv_version","alias_value":"1909.01373v2","created_at":"2026-07-05T00:24:55Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1909.01373","created_at":"2026-07-05T00:24:55Z"},{"alias_kind":"pith_short_12","alias_value":"HGN4OK6L6GMG","created_at":"2026-07-05T00:24:55Z"},{"alias_kind":"pith_short_16","alias_value":"HGN4OK6L6GMGDINZ","created_at":"2026-07-05T00:24:55Z"},{"alias_kind":"pith_short_8","alias_value":"HGN4OK6L","created_at":"2026-07-05T00:24:55Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:HGN4OK6L6GMGDINZIRZK6KJPCW","target":"record","payload":{"canonical_record":{"source":{"id":"1909.01373","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2019-09-03T18:00:26Z","cross_cats_sorted":["astro-ph.HE"],"title_canon_sha256":"b0a594f19cf096046188d287ec92549764b64c831d0f58efb56a0a2fc80b1da9","abstract_canon_sha256":"9b4e8296edf08d6e1ea10e0fee648c6ef936f747cba46beb6124d0f9c2a7b94a"},"schema_version":"1.0"},"canonical_sha256":"399bc72bcbf19861a1b94472af292f1588eb1593529368a48d192540d14b6109","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T00:24:55.766169Z","signature_b64":"GdthHZXFhna9hqs+nwVE9ume1kcuZevnMh0SeV5KnEsF3NvqNH8aUsS6TJDS552gOqZpRl11y+QnAznrzybrBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"399bc72bcbf19861a1b94472af292f1588eb1593529368a48d192540d14b6109","last_reissued_at":"2026-07-05T00:24:55.765747Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T00:24:55.765747Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1909.01373","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":"2026-07-05T00:24:55Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"3eG4VEwW+G7pSxTAVpLJQLx3gkhO7ESZ4XIkvlwk1xqe0NcMEhLza476GKCGq/Qd343uyVSLOgvZqVj8LHh3CA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-15T07:31:09.048751Z"},"content_sha256":"0d08f89048d864bf5d7dbcae4f91f3cf7a69cf6e055059573cd8b42db1d83a23","schema_version":"1.0","event_id":"sha256:0d08f89048d864bf5d7dbcae4f91f3cf7a69cf6e055059573cd8b42db1d83a23"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:HGN4OK6L6GMGDINZIRZK6KJPCW","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Gravitational Waves from the Inspiral of Supermassive Black Holes in Galactic-scale Simulations","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.HE"],"primary_cat":"astro-ph.GA","authors_text":"Antti Rantala, Matias Mannerkoski, Pauli Pihajoki, Peter H. Johansson, Thorsten Naab","submitted_at":"2019-09-03T18:00:26Z","abstract_excerpt":"We study the orbital evolution and gravitational wave (GW) emission of supermassive black hole (SMBH) binaries formed in gas-free mergers of massive early-type galaxies using the hybrid tree-regularized N-body code KETJU. The evolution of the SMBHs and the surrounding galaxies is followed self-consistently from the large-scale merger down to the final few orbits before the black holes coalesce. Post-Newtonian corrections are included up to PN3.5-level for the binary dynamics, and the GW calculations include the corresponding corrections up to PN1.0-level. We analyze the significance of the ste"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1909.01373","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/1909.01373/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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T00:24:55Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"GlDgbTor3Um+6Xf0AzC193b5lP9wUsCDzCqugLu1rrAiggpoImPzFrdig4W3hpSJL+CPT7ujaMF36iByxI4mCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-15T07:31:09.049683Z"},"content_sha256":"c4550afd5804862664e6c52bf9f5efb08a71849d07425fb4578d00e85bca3e7e","schema_version":"1.0","event_id":"sha256:c4550afd5804862664e6c52bf9f5efb08a71849d07425fb4578d00e85bca3e7e"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/HGN4OK6L6GMGDINZIRZK6KJPCW/bundle.json","state_url":"https://pith.science/pith/HGN4OK6L6GMGDINZIRZK6KJPCW/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/HGN4OK6L6GMGDINZIRZK6KJPCW/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":"2026-08-15T07:31:09Z","links":{"resolver":"https://pith.science/pith/HGN4OK6L6GMGDINZIRZK6KJPCW","bundle":"https://pith.science/pith/HGN4OK6L6GMGDINZIRZK6KJPCW/bundle.json","state":"https://pith.science/pith/HGN4OK6L6GMGDINZIRZK6KJPCW/state.json","well_known_bundle":"https://pith.science/.well-known/pith/HGN4OK6L6GMGDINZIRZK6KJPCW/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:HGN4OK6L6GMGDINZIRZK6KJPCW","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":"9b4e8296edf08d6e1ea10e0fee648c6ef936f747cba46beb6124d0f9c2a7b94a","cross_cats_sorted":["astro-ph.HE"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2019-09-03T18:00:26Z","title_canon_sha256":"b0a594f19cf096046188d287ec92549764b64c831d0f58efb56a0a2fc80b1da9"},"schema_version":"1.0","source":{"id":"1909.01373","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1909.01373","created_at":"2026-07-05T00:24:55Z"},{"alias_kind":"arxiv_version","alias_value":"1909.01373v2","created_at":"2026-07-05T00:24:55Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1909.01373","created_at":"2026-07-05T00:24:55Z"},{"alias_kind":"pith_short_12","alias_value":"HGN4OK6L6GMG","created_at":"2026-07-05T00:24:55Z"},{"alias_kind":"pith_short_16","alias_value":"HGN4OK6L6GMGDINZ","created_at":"2026-07-05T00:24:55Z"},{"alias_kind":"pith_short_8","alias_value":"HGN4OK6L","created_at":"2026-07-05T00:24:55Z"}],"graph_snapshots":[{"event_id":"sha256:c4550afd5804862664e6c52bf9f5efb08a71849d07425fb4578d00e85bca3e7e","target":"graph","created_at":"2026-07-05T00:24:55Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/1909.01373/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We study the orbital evolution and gravitational wave (GW) emission of supermassive black hole (SMBH) binaries formed in gas-free mergers of massive early-type galaxies using the hybrid tree-regularized N-body code KETJU. The evolution of the SMBHs and the surrounding galaxies is followed self-consistently from the large-scale merger down to the final few orbits before the black holes coalesce. Post-Newtonian corrections are included up to PN3.5-level for the binary dynamics, and the GW calculations include the corresponding corrections up to PN1.0-level. We analyze the significance of the ste","authors_text":"Antti Rantala, Matias Mannerkoski, Pauli Pihajoki, Peter H. Johansson, Thorsten Naab","cross_cats":["astro-ph.HE"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2019-09-03T18:00:26Z","title":"Gravitational Waves from the Inspiral of Supermassive Black Holes in Galactic-scale Simulations"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1909.01373","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":"sha256:0d08f89048d864bf5d7dbcae4f91f3cf7a69cf6e055059573cd8b42db1d83a23","target":"record","created_at":"2026-07-05T00:24:55Z","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":"9b4e8296edf08d6e1ea10e0fee648c6ef936f747cba46beb6124d0f9c2a7b94a","cross_cats_sorted":["astro-ph.HE"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2019-09-03T18:00:26Z","title_canon_sha256":"b0a594f19cf096046188d287ec92549764b64c831d0f58efb56a0a2fc80b1da9"},"schema_version":"1.0","source":{"id":"1909.01373","kind":"arxiv","version":2}},"canonical_sha256":"399bc72bcbf19861a1b94472af292f1588eb1593529368a48d192540d14b6109","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"399bc72bcbf19861a1b94472af292f1588eb1593529368a48d192540d14b6109","first_computed_at":"2026-07-05T00:24:55.765747Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T00:24:55.765747Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"GdthHZXFhna9hqs+nwVE9ume1kcuZevnMh0SeV5KnEsF3NvqNH8aUsS6TJDS552gOqZpRl11y+QnAznrzybrBQ==","signature_status":"signed_v1","signed_at":"2026-07-05T00:24:55.766169Z","signed_message":"canonical_sha256_bytes"},"source_id":"1909.01373","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:0d08f89048d864bf5d7dbcae4f91f3cf7a69cf6e055059573cd8b42db1d83a23","sha256:c4550afd5804862664e6c52bf9f5efb08a71849d07425fb4578d00e85bca3e7e"],"state_sha256":"946a7c8df39cf5dd3783308accfed5377c8a291d028084028ee8167b7b016a60"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"QlAjD03/BnbB4eV5gXQmeR+FeXu0ty2lFgQFV6zp/QEjzC8pfK/kEglRQLKiPdZiFB8gMG0PM6wbv/JlR50iBg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-15T07:31:09.055699Z","bundle_sha256":"6f5ee8210ddf4319718ed4178a59b34e8722defa18f066e5ba9775cff535bb3c"}}