{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:O2WWQLJQQURIVM43C77OEBGNIC","short_pith_number":"pith:O2WWQLJQ","canonical_record":{"source":{"id":"1808.07081","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-08-21T18:42:58Z","cross_cats_sorted":[],"title_canon_sha256":"939fd35e52b4bf55c08cd3713bfe8136dd2f682e7278d03ea0baf0300ff173a8","abstract_canon_sha256":"61c475c71e9a739dfdc17d2f7cdf0ba5fbf3d0c72df7a6f1bc44efd8fd8d8c1b"},"schema_version":"1.0"},"canonical_sha256":"76ad682d3085228ab39b17fee204cd40a2cb0fb3f93b660c249862ab1a3e3a36","source":{"kind":"arxiv","id":"1808.07081","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1808.07081","created_at":"2026-05-17T23:49:03Z"},{"alias_kind":"arxiv_version","alias_value":"1808.07081v2","created_at":"2026-05-17T23:49:03Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1808.07081","created_at":"2026-05-17T23:49:03Z"},{"alias_kind":"pith_short_12","alias_value":"O2WWQLJQQURI","created_at":"2026-05-18T12:32:40Z"},{"alias_kind":"pith_short_16","alias_value":"O2WWQLJQQURIVM43","created_at":"2026-05-18T12:32:40Z"},{"alias_kind":"pith_short_8","alias_value":"O2WWQLJQ","created_at":"2026-05-18T12:32:40Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:O2WWQLJQQURIVM43C77OEBGNIC","target":"record","payload":{"canonical_record":{"source":{"id":"1808.07081","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-08-21T18:42:58Z","cross_cats_sorted":[],"title_canon_sha256":"939fd35e52b4bf55c08cd3713bfe8136dd2f682e7278d03ea0baf0300ff173a8","abstract_canon_sha256":"61c475c71e9a739dfdc17d2f7cdf0ba5fbf3d0c72df7a6f1bc44efd8fd8d8c1b"},"schema_version":"1.0"},"canonical_sha256":"76ad682d3085228ab39b17fee204cd40a2cb0fb3f93b660c249862ab1a3e3a36","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:49:03.571111Z","signature_b64":"wpfjr+t64mJB/9kql2PEi0y1L7mjbEhlUDDZE5q9tiGj/A83uGTyMDOXWpxzJ2QFQt/GhJkYxXyuCCm3cWasBA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"76ad682d3085228ab39b17fee204cd40a2cb0fb3f93b660c249862ab1a3e3a36","last_reissued_at":"2026-05-17T23:49:03.570562Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:49:03.570562Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1808.07081","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":"2026-05-17T23:49:03Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"oEHCqOlDNk7w8pNqHva0ZPVtDZyya73NB7GA617ePX2Km04rgG5qEwnp0BgJY/kGoFgV7oYhLQT/5gfyotp9AQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-21T04:52:58.389250Z"},"content_sha256":"e94f855000fe932e783ce2eb3ab445aac19a897499f6eae100bdc445b33932fb","schema_version":"1.0","event_id":"sha256:e94f855000fe932e783ce2eb3ab445aac19a897499f6eae100bdc445b33932fb"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:O2WWQLJQQURIVM43C77OEBGNIC","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"On the Origin of Multiple Populations During Massive Star Cluster Formation","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Alison Sills, Corey S. Howard, Ralph E. Pudritz, William E. Harris","submitted_at":"2018-08-21T18:42:58Z","abstract_excerpt":"We investigate the possibility that multiple populations in globular clusters arise as a natural by-product of massive star-cluster formation. We use 3D radiative hydrodynamics simulations for the formation of young massive clusters to track their chemical self-enrichment during their first 5 Myr. These clusters form embedded within filamentary Giant Molecular Clouds by a combination of gas accretion and rapid merging of protoclusters. Chemical enrichment is a dynamic process happening as the young cluster assembles, so that the original (1P) and enriched (2P) subpopulations of stars form almo"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1808.07081","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":"2026-05-17T23:49:03Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"lBSgGDrWn+Hipx9UYugX9W9pLKvOs16fx11sYuCzy4pljBCafaw/dWGFk7YiljZSba5nANptXTO++JN+caoYAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-21T04:52:58.389611Z"},"content_sha256":"67325ee9a117837c371f221678bd25c5473a644060ee7545f0356c5ba53e7ebc","schema_version":"1.0","event_id":"sha256:67325ee9a117837c371f221678bd25c5473a644060ee7545f0356c5ba53e7ebc"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/O2WWQLJQQURIVM43C77OEBGNIC/bundle.json","state_url":"https://pith.science/pith/O2WWQLJQQURIVM43C77OEBGNIC/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/O2WWQLJQQURIVM43C77OEBGNIC/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":"2026-06-21T04:52:58Z","links":{"resolver":"https://pith.science/pith/O2WWQLJQQURIVM43C77OEBGNIC","bundle":"https://pith.science/pith/O2WWQLJQQURIVM43C77OEBGNIC/bundle.json","state":"https://pith.science/pith/O2WWQLJQQURIVM43C77OEBGNIC/state.json","well_known_bundle":"https://pith.science/.well-known/pith/O2WWQLJQQURIVM43C77OEBGNIC/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:O2WWQLJQQURIVM43C77OEBGNIC","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":"61c475c71e9a739dfdc17d2f7cdf0ba5fbf3d0c72df7a6f1bc44efd8fd8d8c1b","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-08-21T18:42:58Z","title_canon_sha256":"939fd35e52b4bf55c08cd3713bfe8136dd2f682e7278d03ea0baf0300ff173a8"},"schema_version":"1.0","source":{"id":"1808.07081","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1808.07081","created_at":"2026-05-17T23:49:03Z"},{"alias_kind":"arxiv_version","alias_value":"1808.07081v2","created_at":"2026-05-17T23:49:03Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1808.07081","created_at":"2026-05-17T23:49:03Z"},{"alias_kind":"pith_short_12","alias_value":"O2WWQLJQQURI","created_at":"2026-05-18T12:32:40Z"},{"alias_kind":"pith_short_16","alias_value":"O2WWQLJQQURIVM43","created_at":"2026-05-18T12:32:40Z"},{"alias_kind":"pith_short_8","alias_value":"O2WWQLJQ","created_at":"2026-05-18T12:32:40Z"}],"graph_snapshots":[{"event_id":"sha256:67325ee9a117837c371f221678bd25c5473a644060ee7545f0356c5ba53e7ebc","target":"graph","created_at":"2026-05-17T23:49:03Z","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":"We investigate the possibility that multiple populations in globular clusters arise as a natural by-product of massive star-cluster formation. We use 3D radiative hydrodynamics simulations for the formation of young massive clusters to track their chemical self-enrichment during their first 5 Myr. These clusters form embedded within filamentary Giant Molecular Clouds by a combination of gas accretion and rapid merging of protoclusters. Chemical enrichment is a dynamic process happening as the young cluster assembles, so that the original (1P) and enriched (2P) subpopulations of stars form almo","authors_text":"Alison Sills, Corey S. Howard, Ralph E. Pudritz, William E. Harris","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-08-21T18:42:58Z","title":"On the Origin of Multiple Populations During Massive Star Cluster Formation"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1808.07081","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:e94f855000fe932e783ce2eb3ab445aac19a897499f6eae100bdc445b33932fb","target":"record","created_at":"2026-05-17T23:49:03Z","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":"61c475c71e9a739dfdc17d2f7cdf0ba5fbf3d0c72df7a6f1bc44efd8fd8d8c1b","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-08-21T18:42:58Z","title_canon_sha256":"939fd35e52b4bf55c08cd3713bfe8136dd2f682e7278d03ea0baf0300ff173a8"},"schema_version":"1.0","source":{"id":"1808.07081","kind":"arxiv","version":2}},"canonical_sha256":"76ad682d3085228ab39b17fee204cd40a2cb0fb3f93b660c249862ab1a3e3a36","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"76ad682d3085228ab39b17fee204cd40a2cb0fb3f93b660c249862ab1a3e3a36","first_computed_at":"2026-05-17T23:49:03.570562Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:49:03.570562Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"wpfjr+t64mJB/9kql2PEi0y1L7mjbEhlUDDZE5q9tiGj/A83uGTyMDOXWpxzJ2QFQt/GhJkYxXyuCCm3cWasBA==","signature_status":"signed_v1","signed_at":"2026-05-17T23:49:03.571111Z","signed_message":"canonical_sha256_bytes"},"source_id":"1808.07081","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:e94f855000fe932e783ce2eb3ab445aac19a897499f6eae100bdc445b33932fb","sha256:67325ee9a117837c371f221678bd25c5473a644060ee7545f0356c5ba53e7ebc"],"state_sha256":"57a2ccf38b906981e755c3af15c8b22453fa9d5cb025c19ce222fe8965a45eef"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"qzhXNZ6iZmliWzbazz1e8s8N5LoLG77KbALcJZMtsmQOUZXNgOsbRUp8gIKiwcKzsAqAt+2EAa10xNrBc0zCAw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-21T04:52:58.391564Z","bundle_sha256":"34f8e1f51abac62cc875a7e8e0e80213c9497f47baadc3b4dbd0e4faa8608fb4"}}