{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2011:PQ33UWZRMJIC2EOGON7KB6FF5I","short_pith_number":"pith:PQ33UWZR","canonical_record":{"source":{"id":"1103.0406","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2011-03-02T12:11:46Z","cross_cats_sorted":[],"title_canon_sha256":"d24679ca21425ba5684f0c3a57f4f1275e529fcf4a8376789bfba108b370a642","abstract_canon_sha256":"b4845699722296a282740b1a7acfc2814be62cc849794cee4e67e23ad91835df"},"schema_version":"1.0"},"canonical_sha256":"7c37ba5b3162502d11c6737ea0f8a5ea0851821968ab311b388a7d1c931ff06b","source":{"kind":"arxiv","id":"1103.0406","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1103.0406","created_at":"2026-05-18T02:03:01Z"},{"alias_kind":"arxiv_version","alias_value":"1103.0406v1","created_at":"2026-05-18T02:03:01Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1103.0406","created_at":"2026-05-18T02:03:01Z"},{"alias_kind":"pith_short_12","alias_value":"PQ33UWZRMJIC","created_at":"2026-05-18T12:26:39Z"},{"alias_kind":"pith_short_16","alias_value":"PQ33UWZRMJIC2EOG","created_at":"2026-05-18T12:26:39Z"},{"alias_kind":"pith_short_8","alias_value":"PQ33UWZR","created_at":"2026-05-18T12:26:39Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2011:PQ33UWZRMJIC2EOGON7KB6FF5I","target":"record","payload":{"canonical_record":{"source":{"id":"1103.0406","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2011-03-02T12:11:46Z","cross_cats_sorted":[],"title_canon_sha256":"d24679ca21425ba5684f0c3a57f4f1275e529fcf4a8376789bfba108b370a642","abstract_canon_sha256":"b4845699722296a282740b1a7acfc2814be62cc849794cee4e67e23ad91835df"},"schema_version":"1.0"},"canonical_sha256":"7c37ba5b3162502d11c6737ea0f8a5ea0851821968ab311b388a7d1c931ff06b","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:03:01.139335Z","signature_b64":"5by40qgQtIso37SxXIJ13diRage0JDdoe/BfWoL80mt89qL1zAms5Ge2uR8/T+NVHhKjzEVpXwYExphPgKw5BQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"7c37ba5b3162502d11c6737ea0f8a5ea0851821968ab311b388a7d1c931ff06b","last_reissued_at":"2026-05-18T02:03:01.138611Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:03:01.138611Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1103.0406","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T02:03:01Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"q0dTsgtKLegh053NGbeIunCHgkTqL0iPW+Zu+TkDqsl+S2SyH/YKXKwNUd7fj3BeUY5c45G0pCu8UEDf1fFYCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-03T18:41:36.621612Z"},"content_sha256":"189d1193be0bf162e0684e021ad7614348913f86634203bf340f3b022a2440c6","schema_version":"1.0","event_id":"sha256:189d1193be0bf162e0684e021ad7614348913f86634203bf340f3b022a2440c6"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2011:PQ33UWZRMJIC2EOGON7KB6FF5I","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Rapid dynamical mass segregation and properties of fractal star clusters","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Jincheng Yu, Li Chen, Richard de Grijs","submitted_at":"2011-03-02T12:11:46Z","abstract_excerpt":"We investigate the evolution of young star clusters using N-body simulations. We confirm that subvirial and fractal-structured clusters will dynamically mass segregate on a short timescale (within 0.5 Myr). We adopt a modified minimum-spanning-tree (MST) method to measure the degree of mass segregation, demonstrating that the stars escaping from a cluster's potential are important for the temporal dependence of mass segregation in the cluster. The form of the initial velocity distribution will also affect the degree of mass segregation. If it depends on radius, the outer parts of the cluster w"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1103.0406","kind":"arxiv","version":1},"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":"2026-05-18T02:03:01Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"VWt8ltMuK7rfnjlbQBPT4RmetBY0eaQoF06vg2vJFPdDhRKCyL4wVePHylh2x3pemGTLyflJBLEE2hplhzx6Ag==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-03T18:41:36.621953Z"},"content_sha256":"89257c1ce3e02387ddd79b59f4448619f19e906d57ff2c56e75233d85ca3019f","schema_version":"1.0","event_id":"sha256:89257c1ce3e02387ddd79b59f4448619f19e906d57ff2c56e75233d85ca3019f"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/PQ33UWZRMJIC2EOGON7KB6FF5I/bundle.json","state_url":"https://pith.science/pith/PQ33UWZRMJIC2EOGON7KB6FF5I/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/PQ33UWZRMJIC2EOGON7KB6FF5I/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":"2026-06-03T18:41:36Z","links":{"resolver":"https://pith.science/pith/PQ33UWZRMJIC2EOGON7KB6FF5I","bundle":"https://pith.science/pith/PQ33UWZRMJIC2EOGON7KB6FF5I/bundle.json","state":"https://pith.science/pith/PQ33UWZRMJIC2EOGON7KB6FF5I/state.json","well_known_bundle":"https://pith.science/.well-known/pith/PQ33UWZRMJIC2EOGON7KB6FF5I/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2011:PQ33UWZRMJIC2EOGON7KB6FF5I","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":"b4845699722296a282740b1a7acfc2814be62cc849794cee4e67e23ad91835df","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2011-03-02T12:11:46Z","title_canon_sha256":"d24679ca21425ba5684f0c3a57f4f1275e529fcf4a8376789bfba108b370a642"},"schema_version":"1.0","source":{"id":"1103.0406","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1103.0406","created_at":"2026-05-18T02:03:01Z"},{"alias_kind":"arxiv_version","alias_value":"1103.0406v1","created_at":"2026-05-18T02:03:01Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1103.0406","created_at":"2026-05-18T02:03:01Z"},{"alias_kind":"pith_short_12","alias_value":"PQ33UWZRMJIC","created_at":"2026-05-18T12:26:39Z"},{"alias_kind":"pith_short_16","alias_value":"PQ33UWZRMJIC2EOG","created_at":"2026-05-18T12:26:39Z"},{"alias_kind":"pith_short_8","alias_value":"PQ33UWZR","created_at":"2026-05-18T12:26:39Z"}],"graph_snapshots":[{"event_id":"sha256:89257c1ce3e02387ddd79b59f4448619f19e906d57ff2c56e75233d85ca3019f","target":"graph","created_at":"2026-05-18T02:03:01Z","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 evolution of young star clusters using N-body simulations. We confirm that subvirial and fractal-structured clusters will dynamically mass segregate on a short timescale (within 0.5 Myr). We adopt a modified minimum-spanning-tree (MST) method to measure the degree of mass segregation, demonstrating that the stars escaping from a cluster's potential are important for the temporal dependence of mass segregation in the cluster. The form of the initial velocity distribution will also affect the degree of mass segregation. If it depends on radius, the outer parts of the cluster w","authors_text":"Jincheng Yu, Li Chen, Richard de Grijs","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2011-03-02T12:11:46Z","title":"Rapid dynamical mass segregation and properties of fractal star clusters"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1103.0406","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":"sha256:189d1193be0bf162e0684e021ad7614348913f86634203bf340f3b022a2440c6","target":"record","created_at":"2026-05-18T02:03:01Z","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":"b4845699722296a282740b1a7acfc2814be62cc849794cee4e67e23ad91835df","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2011-03-02T12:11:46Z","title_canon_sha256":"d24679ca21425ba5684f0c3a57f4f1275e529fcf4a8376789bfba108b370a642"},"schema_version":"1.0","source":{"id":"1103.0406","kind":"arxiv","version":1}},"canonical_sha256":"7c37ba5b3162502d11c6737ea0f8a5ea0851821968ab311b388a7d1c931ff06b","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"7c37ba5b3162502d11c6737ea0f8a5ea0851821968ab311b388a7d1c931ff06b","first_computed_at":"2026-05-18T02:03:01.138611Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:03:01.138611Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"5by40qgQtIso37SxXIJ13diRage0JDdoe/BfWoL80mt89qL1zAms5Ge2uR8/T+NVHhKjzEVpXwYExphPgKw5BQ==","signature_status":"signed_v1","signed_at":"2026-05-18T02:03:01.139335Z","signed_message":"canonical_sha256_bytes"},"source_id":"1103.0406","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:189d1193be0bf162e0684e021ad7614348913f86634203bf340f3b022a2440c6","sha256:89257c1ce3e02387ddd79b59f4448619f19e906d57ff2c56e75233d85ca3019f"],"state_sha256":"f25358ab87ecb45f65c77c41e2d45c1494ad5e0bdf40c58e87c90ad4289eae8c"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"g0H+OUcv8s3B5SwlALJXXHBxS9ZTf3UUrhGPvLuItpdB1z+AdGc/cWE8xJAImOn1x4ynr0DEHM6dZbtIkD06Dg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-03T18:41:36.624230Z","bundle_sha256":"5f3804a2722d906285fba5b04f2649f9bd920a02516edeb132ee0bad8687bae1"}}