{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2025:JWLDNBDJMMBAXZMTFKOB4CVNSG","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":"a065f8e26c6049f17e7f73b1ffc57415e479524fb37e7cdd862ae20e04e8f5b7","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.GA","submitted_at":"2025-02-03T03:37:56Z","title_canon_sha256":"dbe7fe60bb7a5c159869b2959a4a49e30d6a417d86ef5863d97a2bcbbd0e6b4a"},"schema_version":"1.0","source":{"id":"2502.01024","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2502.01024","created_at":"2026-07-05T10:08:41Z"},{"alias_kind":"arxiv_version","alias_value":"2502.01024v1","created_at":"2026-07-05T10:08:41Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2502.01024","created_at":"2026-07-05T10:08:41Z"},{"alias_kind":"pith_short_12","alias_value":"JWLDNBDJMMBA","created_at":"2026-07-05T10:08:41Z"},{"alias_kind":"pith_short_16","alias_value":"JWLDNBDJMMBAXZMT","created_at":"2026-07-05T10:08:41Z"},{"alias_kind":"pith_short_8","alias_value":"JWLDNBDJ","created_at":"2026-07-05T10:08:41Z"}],"graph_snapshots":[{"event_id":"sha256:a1e45bc7cf0d7a2261f21208b8809127d35626c3541ba82131bcffb1ef402a88","target":"graph","created_at":"2026-07-05T10:08:41Z","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/2502.01024/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Recent pulsar timing array (PTA) observations have detected nanohertz gravitational waves, likely originating from massive black hole binaries (MBHBs). The detected amplitude is unexpectedly higher than inferred from the electromagnetic measurements. We present new gravitational wave background (GWB) results from the ASTRID simulation. Its large volume and on-the-fly dynamical friction for MBHs provide new insights into the MBHB population, offering a more accurate assessment of its contribution to the observed GWB. ASTRID predicts a GWB from MBHBs of $h_c=2.8\\times10^{-15}$, or $\\sim45\\%$ of ","authors_text":"Laura Blecha, Luke Zoltan Kelley, Nianyi Chen, Rupert Croft, Simeon Bird, Tiziana Di Matteo, Yanhui Yang, Yihao Zhou, Yueying Ni","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.GA","submitted_at":"2025-02-03T03:37:56Z","title":"The Gravitational Wave Background from Massive Black Holes in the ASTRID Simulation"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2502.01024","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":"sha256:5f8e0fd4378c2b16bbae299eb7348c46272ed067febfecf41b203842e58c3149","target":"record","created_at":"2026-07-05T10:08:41Z","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":"a065f8e26c6049f17e7f73b1ffc57415e479524fb37e7cdd862ae20e04e8f5b7","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.GA","submitted_at":"2025-02-03T03:37:56Z","title_canon_sha256":"dbe7fe60bb7a5c159869b2959a4a49e30d6a417d86ef5863d97a2bcbbd0e6b4a"},"schema_version":"1.0","source":{"id":"2502.01024","kind":"arxiv","version":1}},"canonical_sha256":"4d9636846963020be5932a9c1e0aad918e5377b11bbd5d64496fff2afa5e5183","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"4d9636846963020be5932a9c1e0aad918e5377b11bbd5d64496fff2afa5e5183","first_computed_at":"2026-07-05T10:08:41.788112Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T10:08:41.788112Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"4BJ6/Wej9NKfixuegtdqgSXm0DUtvpjDb5+WrZ4LfaEAo9Vnb0ZXaNmQVMGoeS2fxWKduGokpgw+SUwx+jM9AA==","signature_status":"signed_v1","signed_at":"2026-07-05T10:08:41.788552Z","signed_message":"canonical_sha256_bytes"},"source_id":"2502.01024","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:5f8e0fd4378c2b16bbae299eb7348c46272ed067febfecf41b203842e58c3149","sha256:a1e45bc7cf0d7a2261f21208b8809127d35626c3541ba82131bcffb1ef402a88"],"state_sha256":"671f10ff220a2c0a8a3d7b1eb41e15dbf2ca7e8c7347f191017abb717c63c4b8"}