{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:1999:2INO6IVI3LVXEPHGD4STLKJCFX","short_pith_number":"pith:2INO6IVI","canonical_record":{"source":{"id":"astro-ph/9912166","kind":"arxiv","version":2},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"1999-12-08T15:34:35Z","cross_cats_sorted":[],"title_canon_sha256":"0f077ea2bd69f9f6c7daaa48104aa6b8ed4076b532f7a180fc51e74f35194d1b","abstract_canon_sha256":"36e008f0b24a13e2c83c79a6b86eb4b8a0553638cf58765be1afe62021e7c902"},"schema_version":"1.0"},"canonical_sha256":"d21aef22a8daeb723ce61f2535a9222dd397716305e55a7a8416bbcd8756c671","source":{"kind":"arxiv","id":"astro-ph/9912166","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/9912166","created_at":"2026-07-04T16:11:59Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/9912166v2","created_at":"2026-07-04T16:11:59Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/9912166","created_at":"2026-07-04T16:11:59Z"},{"alias_kind":"pith_short_12","alias_value":"2INO6IVI3LVX","created_at":"2026-07-04T16:11:59Z"},{"alias_kind":"pith_short_16","alias_value":"2INO6IVI3LVXEPHG","created_at":"2026-07-04T16:11:59Z"},{"alias_kind":"pith_short_8","alias_value":"2INO6IVI","created_at":"2026-07-04T16:11:59Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:1999:2INO6IVI3LVXEPHGD4STLKJCFX","target":"record","payload":{"canonical_record":{"source":{"id":"astro-ph/9912166","kind":"arxiv","version":2},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"1999-12-08T15:34:35Z","cross_cats_sorted":[],"title_canon_sha256":"0f077ea2bd69f9f6c7daaa48104aa6b8ed4076b532f7a180fc51e74f35194d1b","abstract_canon_sha256":"36e008f0b24a13e2c83c79a6b86eb4b8a0553638cf58765be1afe62021e7c902"},"schema_version":"1.0"},"canonical_sha256":"d21aef22a8daeb723ce61f2535a9222dd397716305e55a7a8416bbcd8756c671","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T16:11:59.334116Z","signature_b64":"dmoCzi213S75sGVF5tIvKCReC0h9q5CyeNmgBTi16uwgXZVfxHFxseDyRK23+kWRztJEXWiITYE9ktHWF26GCg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"d21aef22a8daeb723ce61f2535a9222dd397716305e55a7a8416bbcd8756c671","last_reissued_at":"2026-07-04T16:11:59.333761Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T16:11:59.333761Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"astro-ph/9912166","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":"2026-07-04T16:11:59Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"sVI5WpqP2fz1YjgrHOF8lCW5hjK0uFe5gVUd7cPEnpFTTEDSNuQFi9F753IpTD3A3LhMF4PDUPiczL+25uA3Bg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-05T06:51:03.468948Z"},"content_sha256":"464ff75c04ed2c5d2c9871e5cbc1a1dee33babf344b1b8eb410f76d609eec572","schema_version":"1.0","event_id":"sha256:464ff75c04ed2c5d2c9871e5cbc1a1dee33babf344b1b8eb410f76d609eec572"},{"event_type":"graph_snapshot","subject_pith_number":"pith:1999:2INO6IVI3LVXEPHGD4STLKJCFX","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Formation of Disk Galaxies: Warm Dark Matter and the Angular Momentum problem","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"Alexandre Dolgov, Jesper Sommer-Larsen","submitted_at":"1999-12-08T15:34:35Z","abstract_excerpt":"We have performed TreeSPH simulations of disk galaxy formation in various warm dark matter (WDM) cosmologies. Our results indicate that for a range of WDM free-streaming masses, the disk galaxy formation angular momentum problem can be completely resolved by going to the WDM structure formation scenario, without having to invoke stellar feedback processes at all. We also confirm our previous suspicion, that part of the angular momentum problem is due to numerical effects, most likely related to the shock capturing, artificial viscosity used in SPH. Furthermore we find that we can match the obs"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/9912166","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/astro-ph/9912166/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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-04T16:11:59Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"VqrdeGFeS0vIAfbf95vj8e9UKdXwMrVdJu/eFe+yjrpMs+HS7o66TCFS54D4a8Vi+ismk/47G3VbKb31+Qk4Dw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-05T06:51:03.469894Z"},"content_sha256":"b23ab9ec9e6fb9dd38323c1e21f9e5af072a4fb34159aee779a523cbf1a88b64","schema_version":"1.0","event_id":"sha256:b23ab9ec9e6fb9dd38323c1e21f9e5af072a4fb34159aee779a523cbf1a88b64"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/2INO6IVI3LVXEPHGD4STLKJCFX/bundle.json","state_url":"https://pith.science/pith/2INO6IVI3LVXEPHGD4STLKJCFX/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/2INO6IVI3LVXEPHGD4STLKJCFX/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":"2026-08-05T06:51:03Z","links":{"resolver":"https://pith.science/pith/2INO6IVI3LVXEPHGD4STLKJCFX","bundle":"https://pith.science/pith/2INO6IVI3LVXEPHGD4STLKJCFX/bundle.json","state":"https://pith.science/pith/2INO6IVI3LVXEPHGD4STLKJCFX/state.json","well_known_bundle":"https://pith.science/.well-known/pith/2INO6IVI3LVXEPHGD4STLKJCFX/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:1999:2INO6IVI3LVXEPHGD4STLKJCFX","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":"36e008f0b24a13e2c83c79a6b86eb4b8a0553638cf58765be1afe62021e7c902","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"1999-12-08T15:34:35Z","title_canon_sha256":"0f077ea2bd69f9f6c7daaa48104aa6b8ed4076b532f7a180fc51e74f35194d1b"},"schema_version":"1.0","source":{"id":"astro-ph/9912166","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/9912166","created_at":"2026-07-04T16:11:59Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/9912166v2","created_at":"2026-07-04T16:11:59Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/9912166","created_at":"2026-07-04T16:11:59Z"},{"alias_kind":"pith_short_12","alias_value":"2INO6IVI3LVX","created_at":"2026-07-04T16:11:59Z"},{"alias_kind":"pith_short_16","alias_value":"2INO6IVI3LVXEPHG","created_at":"2026-07-04T16:11:59Z"},{"alias_kind":"pith_short_8","alias_value":"2INO6IVI","created_at":"2026-07-04T16:11:59Z"}],"graph_snapshots":[{"event_id":"sha256:b23ab9ec9e6fb9dd38323c1e21f9e5af072a4fb34159aee779a523cbf1a88b64","target":"graph","created_at":"2026-07-04T16:11:59Z","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/astro-ph/9912166/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We have performed TreeSPH simulations of disk galaxy formation in various warm dark matter (WDM) cosmologies. Our results indicate that for a range of WDM free-streaming masses, the disk galaxy formation angular momentum problem can be completely resolved by going to the WDM structure formation scenario, without having to invoke stellar feedback processes at all. We also confirm our previous suspicion, that part of the angular momentum problem is due to numerical effects, most likely related to the shock capturing, artificial viscosity used in SPH. Furthermore we find that we can match the obs","authors_text":"Alexandre Dolgov, Jesper Sommer-Larsen","cross_cats":[],"headline":"","license":"","primary_cat":"astro-ph","submitted_at":"1999-12-08T15:34:35Z","title":"Formation of Disk Galaxies: Warm Dark Matter and the Angular Momentum problem"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/9912166","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":"sha256:464ff75c04ed2c5d2c9871e5cbc1a1dee33babf344b1b8eb410f76d609eec572","target":"record","created_at":"2026-07-04T16:11:59Z","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":"36e008f0b24a13e2c83c79a6b86eb4b8a0553638cf58765be1afe62021e7c902","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"1999-12-08T15:34:35Z","title_canon_sha256":"0f077ea2bd69f9f6c7daaa48104aa6b8ed4076b532f7a180fc51e74f35194d1b"},"schema_version":"1.0","source":{"id":"astro-ph/9912166","kind":"arxiv","version":2}},"canonical_sha256":"d21aef22a8daeb723ce61f2535a9222dd397716305e55a7a8416bbcd8756c671","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"d21aef22a8daeb723ce61f2535a9222dd397716305e55a7a8416bbcd8756c671","first_computed_at":"2026-07-04T16:11:59.333761Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T16:11:59.333761Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"dmoCzi213S75sGVF5tIvKCReC0h9q5CyeNmgBTi16uwgXZVfxHFxseDyRK23+kWRztJEXWiITYE9ktHWF26GCg==","signature_status":"signed_v1","signed_at":"2026-07-04T16:11:59.334116Z","signed_message":"canonical_sha256_bytes"},"source_id":"astro-ph/9912166","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:464ff75c04ed2c5d2c9871e5cbc1a1dee33babf344b1b8eb410f76d609eec572","sha256:b23ab9ec9e6fb9dd38323c1e21f9e5af072a4fb34159aee779a523cbf1a88b64"],"state_sha256":"975d4d29d5a092db3c1b512e5f14a0469819424d0f9a1fbc190c3f08cfa9c893"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"6MvsB83rTidVx1KAY9kwcGb8A8GAcxYLZdosJdXRKFvP5mrd5ejTcOC30e86GxHcEtJU+Hb6SWHychnagj3oDA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-05T06:51:03.476286Z","bundle_sha256":"49af671add3019654426c1f1f51916084eeccaba3be45b49de5e1e6d998e59b4"}}