{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:BMPNKAONXYA5KO5VNVSNPFHGVQ","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":"cc5160714f8f73dd43823102d8020c5eb345587149d5d1043ab187343e7b590a","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-09-23T09:21:50Z","title_canon_sha256":"ced29a35f5eaa70f7bcd091148a68c335c0616b2f635c1a7b4ec2efbaaa803a9"},"schema_version":"1.0","source":{"id":"0909.4156","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0909.4156","created_at":"2026-05-18T02:11:45Z"},{"alias_kind":"arxiv_version","alias_value":"0909.4156v1","created_at":"2026-05-18T02:11:45Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0909.4156","created_at":"2026-05-18T02:11:45Z"},{"alias_kind":"pith_short_12","alias_value":"BMPNKAONXYA5","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_16","alias_value":"BMPNKAONXYA5KO5V","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_8","alias_value":"BMPNKAON","created_at":"2026-05-18T12:25:58Z"}],"graph_snapshots":[{"event_id":"sha256:d4fdae1d4665b5b5406edf96d16b8622a220bde3c170d5f92f4756c71e5af696","target":"graph","created_at":"2026-05-18T02:11:45Z","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 conduct a systematic study of the angular momentum problem in numerical simulations of disk galaxy formation. We investigate the role of numerical resolution using a semi-cosmological setup which combines an efficient use of the number of particles in an isolated halo while preserving the hierarchical build-up of the disk through the merging of clumps. We perform the same simulation varying the resolution over 4 orders of magnitude. Independent on the level of resolution, the loss of angular momentum stays the same and can be tied to dynamical friction during the build-up phase. This is con","authors_text":"Franziska Piontek, Matthias Steinmetz","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-09-23T09:21:50Z","title":"The Angular Momentum Problem in Cosmological Simulations of Disk Galaxy Formation"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0909.4156","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:a4676531f26f033d8ba8a090b6a3219602fd970384e83e2374b103b4c0996afe","target":"record","created_at":"2026-05-18T02:11:45Z","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":"cc5160714f8f73dd43823102d8020c5eb345587149d5d1043ab187343e7b590a","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-09-23T09:21:50Z","title_canon_sha256":"ced29a35f5eaa70f7bcd091148a68c335c0616b2f635c1a7b4ec2efbaaa803a9"},"schema_version":"1.0","source":{"id":"0909.4156","kind":"arxiv","version":1}},"canonical_sha256":"0b1ed501cdbe01d53bb56d64d794e6ac02c5e1ccb6efddc43850e7e1e621cb70","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"0b1ed501cdbe01d53bb56d64d794e6ac02c5e1ccb6efddc43850e7e1e621cb70","first_computed_at":"2026-05-18T02:11:45.001605Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:11:45.001605Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"8eDkoIE6kKV7bZMOwjU/FrM1VyN7X2bQd2fjZNjDUFOiNhB4uY+YGOkxp8TzgEVBjc48Rj2SCCc0UFmju7V+Aw==","signature_status":"signed_v1","signed_at":"2026-05-18T02:11:45.002244Z","signed_message":"canonical_sha256_bytes"},"source_id":"0909.4156","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:a4676531f26f033d8ba8a090b6a3219602fd970384e83e2374b103b4c0996afe","sha256:d4fdae1d4665b5b5406edf96d16b8622a220bde3c170d5f92f4756c71e5af696"],"state_sha256":"bfe9647631abb0ec7da2067eaa17b61aae2a4c5e6f4d0dfcf082eaa4ef5376d0"}