{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:YTMBY7G53SYAAT6LB5XFI2W2H6","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":"262cced624ec9c93615484ae3ccfddaa7b4fbcf83e60aa7d4c59c89fe5a1c3cc","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-06-02T18:47:31Z","title_canon_sha256":"4ba64c7f700d0d5c09ef2240212bd407bc53f7b61fb23661fb85f25b2e238cef"},"schema_version":"1.0","source":{"id":"1606.00796","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1606.00796","created_at":"2026-05-18T00:52:17Z"},{"alias_kind":"arxiv_version","alias_value":"1606.00796v2","created_at":"2026-05-18T00:52:17Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1606.00796","created_at":"2026-05-18T00:52:17Z"},{"alias_kind":"pith_short_12","alias_value":"YTMBY7G53SYA","created_at":"2026-05-18T12:30:53Z"},{"alias_kind":"pith_short_16","alias_value":"YTMBY7G53SYAAT6L","created_at":"2026-05-18T12:30:53Z"},{"alias_kind":"pith_short_8","alias_value":"YTMBY7G5","created_at":"2026-05-18T12:30:53Z"}],"graph_snapshots":[{"event_id":"sha256:fd0ac53e6546d6355acf8b90d0c2328dbebf45bc3ffc33a773d4a26eaa1cb50d","target":"graph","created_at":"2026-05-18T00:52:17Z","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":"The long-standing challenge of creating a Milky Way-like disk galaxy from cosmological simulations has motivated significant developments in both numerical methods and physical models in recent years. We investigate these two fundamental aspects in a new comparison project using a set of cosmological hydrodynamic simulations of the formation and evolution of a Milky Way-size galaxy. In this study, we focus on the comparison of two particle-based hydrodynamics methods: the improved smoothed particle hydrodynamics (SPH) code Gadget, and the Lagrangian Meshless Finite-Mass (MFM) code GIZMO. All t","authors_text":"Qirong Zhu, Yuexing Li","cross_cats":["astro-ph.CO"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-06-02T18:47:31Z","title":"The Formation of a Milky Way-sized Disk Galaxy 1. A Comparison of Numerical Methods"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1606.00796","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":"sha256:0db8b49a2b8c4da4afd2a16f7618bb369df5a105ed39ec57d3ecfbc9b16ee315","target":"record","created_at":"2026-05-18T00:52:17Z","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":"262cced624ec9c93615484ae3ccfddaa7b4fbcf83e60aa7d4c59c89fe5a1c3cc","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-06-02T18:47:31Z","title_canon_sha256":"4ba64c7f700d0d5c09ef2240212bd407bc53f7b61fb23661fb85f25b2e238cef"},"schema_version":"1.0","source":{"id":"1606.00796","kind":"arxiv","version":2}},"canonical_sha256":"c4d81c7cdddcb0004fcb0f6e546ada3f94a09019cc283ab4f06686f47424a24f","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"c4d81c7cdddcb0004fcb0f6e546ada3f94a09019cc283ab4f06686f47424a24f","first_computed_at":"2026-05-18T00:52:17.176108Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:52:17.176108Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"OyrdQkXv2g1vjWMLgheHJGlYOzHSRjFOdct0+8L1iPCqDG720UmFLzkzRPw2PN631iYUtZ0I7/0eu1uHH8nYAQ==","signature_status":"signed_v1","signed_at":"2026-05-18T00:52:17.176515Z","signed_message":"canonical_sha256_bytes"},"source_id":"1606.00796","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:0db8b49a2b8c4da4afd2a16f7618bb369df5a105ed39ec57d3ecfbc9b16ee315","sha256:fd0ac53e6546d6355acf8b90d0c2328dbebf45bc3ffc33a773d4a26eaa1cb50d"],"state_sha256":"bcb223b557879429088c4b5b6bba9d7fc6f9f6f96995856dfb5bd07b1557600e"}