{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:4I7YLWXJCP3YSAIT4BHZDGOIHY","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":"85fdb8dab0769325aa99242e5e9d9ed3e0d8c045a6244f44d3a28727880595ff","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2013-08-07T12:30:20Z","title_canon_sha256":"0d6243f81270d93550c768b4676fed5fd589837233988c99d90426c6459ba874"},"schema_version":"1.0","source":{"id":"1308.1549","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1308.1549","created_at":"2026-05-18T03:11:46Z"},{"alias_kind":"arxiv_version","alias_value":"1308.1549v1","created_at":"2026-05-18T03:11:46Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1308.1549","created_at":"2026-05-18T03:11:46Z"},{"alias_kind":"pith_short_12","alias_value":"4I7YLWXJCP3Y","created_at":"2026-05-18T12:27:34Z"},{"alias_kind":"pith_short_16","alias_value":"4I7YLWXJCP3YSAIT","created_at":"2026-05-18T12:27:34Z"},{"alias_kind":"pith_short_8","alias_value":"4I7YLWXJ","created_at":"2026-05-18T12:27:34Z"}],"graph_snapshots":[{"event_id":"sha256:e1745bc4d925b4ad8d9e1fae94260eb97913f3cb988187f0f1d1ec04bc473ee6","target":"graph","created_at":"2026-05-18T03:11:46Z","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 compute the abundance gradients along the disk of the Milky Way by means of the two-infall model: in particular, the gradients of oxygen and iron and their temporal evolution. First, we explore the effects of several physical processes which influence the formation and evolution of abundance gradients. They are: i) the inside-out formation of the disk, ii) a threshold in the gas density for star formation, iii) a variable star formation efficiency along the disk, iv) radial flows and their speed, and v) different total surface mass density (gas plus stars) distributions for the halo. We are","authors_text":"A. Mott, E. Spitoni, F. Matteucci","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2013-08-07T12:30:20Z","title":"Abundance gradients in spiral disks: is the gradient inversion at high redshift real?"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1308.1549","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:b2be329ad7553d150ab36635f3a01bbdef1676b4fb38d0b70ba934c79510635b","target":"record","created_at":"2026-05-18T03:11:46Z","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":"85fdb8dab0769325aa99242e5e9d9ed3e0d8c045a6244f44d3a28727880595ff","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2013-08-07T12:30:20Z","title_canon_sha256":"0d6243f81270d93550c768b4676fed5fd589837233988c99d90426c6459ba874"},"schema_version":"1.0","source":{"id":"1308.1549","kind":"arxiv","version":1}},"canonical_sha256":"e23f85dae913f7890113e04f9199c83e02df0e6a692c774aaf775e6288081cac","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"e23f85dae913f7890113e04f9199c83e02df0e6a692c774aaf775e6288081cac","first_computed_at":"2026-05-18T03:11:46.193988Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:11:46.193988Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"8IRb89H1lsx1ImykaSxDqF4+PK2AFWXdNUYLEoj/EZUUxQlLKNc9jnPpnkV4yszpu+AWpY7DH6U+5gJolHEWCA==","signature_status":"signed_v1","signed_at":"2026-05-18T03:11:46.194816Z","signed_message":"canonical_sha256_bytes"},"source_id":"1308.1549","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:b2be329ad7553d150ab36635f3a01bbdef1676b4fb38d0b70ba934c79510635b","sha256:e1745bc4d925b4ad8d9e1fae94260eb97913f3cb988187f0f1d1ec04bc473ee6"],"state_sha256":"c4d5bb90f0e440c6d01e63ef8f878174291f33e54af90ff7b3a8d67826fe9032"}