{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2023:I6U2OBPHYVJ7V2X5YFJVSBJOS3","short_pith_number":"pith:I6U2OBPH","schema_version":"1.0","canonical_sha256":"47a9a705e7c553faeafdc15359052e96dcf87511040eb303b8a4386fa1626f7e","source":{"kind":"arxiv","id":"2303.15511","version":3},"attestation_state":"computed","paper":{"title":"Massive binary black holes from Population II and III stars","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["astro-ph.HE","astro-ph.SR"],"primary_cat":"astro-ph.GA","authors_text":"Alessandro Bressan, Filippo Santoliquido, Gast\\'on J. Escobar, Giuliano Iorio, Guglielmo Costa, Michela Mapelli, Ralf S. Klessen","submitted_at":"2023-03-27T18:00:05Z","abstract_excerpt":"Population III stars, born from the primordial gas in the Universe, lose a negligible fraction of their mass via stellar winds and possibly follow a top-heavy mass function. Hence, they have often been regarded as the ideal progenitors of massive black holes (BHs), even above the pair instability mass gap. Here, we evolve a large set of Population III binary stars (metallicity $Z=10^{-11}$) with our population-synthesis code SEVN, and compare them with Population II binary stars ($Z=10^{-4}$). In our models, the lower edge of the pair-instability mass gap corresponds to a BH mass of $\\approx{8"},"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":"2303.15511","kind":"arxiv","version":3},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.GA","submitted_at":"2023-03-27T18:00:05Z","cross_cats_sorted":["astro-ph.HE","astro-ph.SR"],"title_canon_sha256":"47988ac04e91b29c05f1f6c65948b26f45a4c6aff80cc7b64a6223dd85c50f19","abstract_canon_sha256":"ccb62a097b28d14772f96ac180b9e35159cd8e17408eb91a7de66cf89ce58834"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T06:44:19.659382Z","signature_b64":"EI1MeZq4zTBa67bFyS2KjG0ua8J04j+A+lMTaV8MuyjRFSyLrawDR2dXuLzVUCn3dWOBP5EHqogBpvQgnURBDA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"47a9a705e7c553faeafdc15359052e96dcf87511040eb303b8a4386fa1626f7e","last_reissued_at":"2026-07-05T06:44:19.658655Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T06:44:19.658655Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Massive binary black holes from Population II and III stars","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["astro-ph.HE","astro-ph.SR"],"primary_cat":"astro-ph.GA","authors_text":"Alessandro Bressan, Filippo Santoliquido, Gast\\'on J. Escobar, Giuliano Iorio, Guglielmo Costa, Michela Mapelli, Ralf S. Klessen","submitted_at":"2023-03-27T18:00:05Z","abstract_excerpt":"Population III stars, born from the primordial gas in the Universe, lose a negligible fraction of their mass via stellar winds and possibly follow a top-heavy mass function. Hence, they have often been regarded as the ideal progenitors of massive black holes (BHs), even above the pair instability mass gap. Here, we evolve a large set of Population III binary stars (metallicity $Z=10^{-11}$) with our population-synthesis code SEVN, and compare them with Population II binary stars ($Z=10^{-4}$). In our models, the lower edge of the pair-instability mass gap corresponds to a BH mass of $\\approx{8"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2303.15511","kind":"arxiv","version":3},"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/2303.15511/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"},"aliases":[{"alias_kind":"arxiv","alias_value":"2303.15511","created_at":"2026-07-05T06:44:19.658744+00:00"},{"alias_kind":"arxiv_version","alias_value":"2303.15511v3","created_at":"2026-07-05T06:44:19.658744+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2303.15511","created_at":"2026-07-05T06:44:19.658744+00:00"},{"alias_kind":"pith_short_12","alias_value":"I6U2OBPHYVJ7","created_at":"2026-07-05T06:44:19.658744+00:00"},{"alias_kind":"pith_short_16","alias_value":"I6U2OBPHYVJ7V2X5","created_at":"2026-07-05T06:44:19.658744+00:00"},{"alias_kind":"pith_short_8","alias_value":"I6U2OBPH","created_at":"2026-07-05T06:44:19.658744+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/I6U2OBPHYVJ7V2X5YFJVSBJOS3","json":"https://pith.science/pith/I6U2OBPHYVJ7V2X5YFJVSBJOS3.json","graph_json":"https://pith.science/api/pith-number/I6U2OBPHYVJ7V2X5YFJVSBJOS3/graph.json","events_json":"https://pith.science/api/pith-number/I6U2OBPHYVJ7V2X5YFJVSBJOS3/events.json","paper":"https://pith.science/paper/I6U2OBPH"},"agent_actions":{"view_html":"https://pith.science/pith/I6U2OBPHYVJ7V2X5YFJVSBJOS3","download_json":"https://pith.science/pith/I6U2OBPHYVJ7V2X5YFJVSBJOS3.json","view_paper":"https://pith.science/paper/I6U2OBPH","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=2303.15511&json=true","fetch_graph":"https://pith.science/api/pith-number/I6U2OBPHYVJ7V2X5YFJVSBJOS3/graph.json","fetch_events":"https://pith.science/api/pith-number/I6U2OBPHYVJ7V2X5YFJVSBJOS3/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/I6U2OBPHYVJ7V2X5YFJVSBJOS3/action/timestamp_anchor","attest_storage":"https://pith.science/pith/I6U2OBPHYVJ7V2X5YFJVSBJOS3/action/storage_attestation","attest_author":"https://pith.science/pith/I6U2OBPHYVJ7V2X5YFJVSBJOS3/action/author_attestation","sign_citation":"https://pith.science/pith/I6U2OBPHYVJ7V2X5YFJVSBJOS3/action/citation_signature","submit_replication":"https://pith.science/pith/I6U2OBPHYVJ7V2X5YFJVSBJOS3/action/replication_record"}},"created_at":"2026-07-05T06:44:19.658744+00:00","updated_at":"2026-07-05T06:44:19.658744+00:00"}