{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2008:KYWA6ZDNSMKHJQUOLBRAQYCV2J","short_pith_number":"pith:KYWA6ZDN","canonical_record":{"source":{"id":"0807.2959","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2008-07-18T18:35:20Z","cross_cats_sorted":[],"title_canon_sha256":"1bacacdc341ccb296c9dc0cdd5ff4567f78234299e9a54d2b58996df09d012ed","abstract_canon_sha256":"32de63e9551be514ac073784af365ec6f4c2adf02858f8a025ca91c415f74cb8"},"schema_version":"1.0"},"canonical_sha256":"562c0f646d931474c28e5862086055d273508b3c20e0b50c98ebaba9f5b82494","source":{"kind":"arxiv","id":"0807.2959","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0807.2959","created_at":"2026-05-18T02:15:44Z"},{"alias_kind":"arxiv_version","alias_value":"0807.2959v2","created_at":"2026-05-18T02:15:44Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0807.2959","created_at":"2026-05-18T02:15:44Z"},{"alias_kind":"pith_short_12","alias_value":"KYWA6ZDNSMKH","created_at":"2026-05-18T12:25:57Z"},{"alias_kind":"pith_short_16","alias_value":"KYWA6ZDNSMKHJQUO","created_at":"2026-05-18T12:25:57Z"},{"alias_kind":"pith_short_8","alias_value":"KYWA6ZDN","created_at":"2026-05-18T12:25:57Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2008:KYWA6ZDNSMKHJQUOLBRAQYCV2J","target":"record","payload":{"canonical_record":{"source":{"id":"0807.2959","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2008-07-18T18:35:20Z","cross_cats_sorted":[],"title_canon_sha256":"1bacacdc341ccb296c9dc0cdd5ff4567f78234299e9a54d2b58996df09d012ed","abstract_canon_sha256":"32de63e9551be514ac073784af365ec6f4c2adf02858f8a025ca91c415f74cb8"},"schema_version":"1.0"},"canonical_sha256":"562c0f646d931474c28e5862086055d273508b3c20e0b50c98ebaba9f5b82494","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:15:44.862797Z","signature_b64":"okI1G9RJaIeBUjed10c1mVR0aJ971Xcp6SV+dc4VXnxoJLPnnBtKfghaN7JIGzmmb+wES2n0gWq2MRKFP95KBg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"562c0f646d931474c28e5862086055d273508b3c20e0b50c98ebaba9f5b82494","last_reissued_at":"2026-05-18T02:15:44.862203Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:15:44.862203Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0807.2959","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":"2026-05-18T02:15:44Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"6wGQ2DYwDf2WguL4hVnTI3DFzsExghZ0MlFHqTdUYpPd1Ky2rNZLG4pDGrFAdQSKuYMZkob4ShgQjworA0iHCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-03T05:04:24.451250Z"},"content_sha256":"10c16bcc7008529d4ec377458f8668b70dbd4ccb5ba55ffcad7ced88fb2528b8","schema_version":"1.0","event_id":"sha256:10c16bcc7008529d4ec377458f8668b70dbd4ccb5ba55ffcad7ced88fb2528b8"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2008:KYWA6ZDNSMKHJQUOLBRAQYCV2J","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Disk Sizes in a LCDM Universe","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"Qi Guo, Simon White","submitted_at":"2008-07-18T18:35:20Z","abstract_excerpt":"We introduce a model which uses semi-analytic techniques to trace formation and evolution of galaxy disks in their cosmological context. For the first time we model the growth of gas and stellar disks separately. In contrast to previous work we follow in detail the angular momentum accumulation history through the gas cooling, merging and star formation processes. Our model successfully reproduces the stellar mass--radius distribution and gas-to-stellar disk size ratio distribution observed locally. We also investigate the dependence of clustering on galaxy size and find qualitative agreement "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0807.2959","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":"2026-05-18T02:15:44Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"U5dPKAIfEicAKq3ugmrYS6a9GY77Y3lJ3+Nea193CcdKNP7TmRzkLsUbZfLNGRFgCApKayrB4Xm0ZAcUPyV0Bg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-03T05:04:24.451611Z"},"content_sha256":"641ec75bb50f0b179b138e8b70c32744d32d390b9debba08716646805e4873d6","schema_version":"1.0","event_id":"sha256:641ec75bb50f0b179b138e8b70c32744d32d390b9debba08716646805e4873d6"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/KYWA6ZDNSMKHJQUOLBRAQYCV2J/bundle.json","state_url":"https://pith.science/pith/KYWA6ZDNSMKHJQUOLBRAQYCV2J/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/KYWA6ZDNSMKHJQUOLBRAQYCV2J/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":"2026-06-03T05:04:24Z","links":{"resolver":"https://pith.science/pith/KYWA6ZDNSMKHJQUOLBRAQYCV2J","bundle":"https://pith.science/pith/KYWA6ZDNSMKHJQUOLBRAQYCV2J/bundle.json","state":"https://pith.science/pith/KYWA6ZDNSMKHJQUOLBRAQYCV2J/state.json","well_known_bundle":"https://pith.science/.well-known/pith/KYWA6ZDNSMKHJQUOLBRAQYCV2J/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2008:KYWA6ZDNSMKHJQUOLBRAQYCV2J","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":"32de63e9551be514ac073784af365ec6f4c2adf02858f8a025ca91c415f74cb8","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2008-07-18T18:35:20Z","title_canon_sha256":"1bacacdc341ccb296c9dc0cdd5ff4567f78234299e9a54d2b58996df09d012ed"},"schema_version":"1.0","source":{"id":"0807.2959","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0807.2959","created_at":"2026-05-18T02:15:44Z"},{"alias_kind":"arxiv_version","alias_value":"0807.2959v2","created_at":"2026-05-18T02:15:44Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0807.2959","created_at":"2026-05-18T02:15:44Z"},{"alias_kind":"pith_short_12","alias_value":"KYWA6ZDNSMKH","created_at":"2026-05-18T12:25:57Z"},{"alias_kind":"pith_short_16","alias_value":"KYWA6ZDNSMKHJQUO","created_at":"2026-05-18T12:25:57Z"},{"alias_kind":"pith_short_8","alias_value":"KYWA6ZDN","created_at":"2026-05-18T12:25:57Z"}],"graph_snapshots":[{"event_id":"sha256:641ec75bb50f0b179b138e8b70c32744d32d390b9debba08716646805e4873d6","target":"graph","created_at":"2026-05-18T02:15:44Z","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 introduce a model which uses semi-analytic techniques to trace formation and evolution of galaxy disks in their cosmological context. For the first time we model the growth of gas and stellar disks separately. In contrast to previous work we follow in detail the angular momentum accumulation history through the gas cooling, merging and star formation processes. Our model successfully reproduces the stellar mass--radius distribution and gas-to-stellar disk size ratio distribution observed locally. We also investigate the dependence of clustering on galaxy size and find qualitative agreement ","authors_text":"Qi Guo, Simon White","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2008-07-18T18:35:20Z","title":"Disk Sizes in a LCDM Universe"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0807.2959","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":"sha256:10c16bcc7008529d4ec377458f8668b70dbd4ccb5ba55ffcad7ced88fb2528b8","target":"record","created_at":"2026-05-18T02:15:44Z","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":"32de63e9551be514ac073784af365ec6f4c2adf02858f8a025ca91c415f74cb8","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2008-07-18T18:35:20Z","title_canon_sha256":"1bacacdc341ccb296c9dc0cdd5ff4567f78234299e9a54d2b58996df09d012ed"},"schema_version":"1.0","source":{"id":"0807.2959","kind":"arxiv","version":2}},"canonical_sha256":"562c0f646d931474c28e5862086055d273508b3c20e0b50c98ebaba9f5b82494","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"562c0f646d931474c28e5862086055d273508b3c20e0b50c98ebaba9f5b82494","first_computed_at":"2026-05-18T02:15:44.862203Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:15:44.862203Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"okI1G9RJaIeBUjed10c1mVR0aJ971Xcp6SV+dc4VXnxoJLPnnBtKfghaN7JIGzmmb+wES2n0gWq2MRKFP95KBg==","signature_status":"signed_v1","signed_at":"2026-05-18T02:15:44.862797Z","signed_message":"canonical_sha256_bytes"},"source_id":"0807.2959","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:10c16bcc7008529d4ec377458f8668b70dbd4ccb5ba55ffcad7ced88fb2528b8","sha256:641ec75bb50f0b179b138e8b70c32744d32d390b9debba08716646805e4873d6"],"state_sha256":"e44ab07ea2363b4a1f0b4efed508e60b4a0803aeb856e63dac8778b355a7ab79"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"t0f5bpXfWrPKEMnj91UaEbdTXhavDC+x2RpHd2fEC044KDJQM7Ch0UFXZIAFPuDrr+OEE3Fopmp02/DqzWtKCQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-03T05:04:24.453547Z","bundle_sha256":"d8e37c41cfe46d93a3c9539a444ddf813d2e7bc3ed8c849e616eabb95fe1fdfe"}}