{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:D2ZIETJDEHPJ74MGSP4HS2EVYH","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":"e7dffe98c8f6c37ae1cae4c9be607e1c042dfd6be4b5a1188908eb5a20cde837","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2021-09-15T19:02:41Z","title_canon_sha256":"bf838cb05f0689b32f94b78a44320f8983cea3a0e4e1125995187fadcaffe6db"},"schema_version":"1.0","source":{"id":"2109.07535","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2109.07535","created_at":"2026-07-05T03:17:59Z"},{"alias_kind":"arxiv_version","alias_value":"2109.07535v1","created_at":"2026-07-05T03:17:59Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2109.07535","created_at":"2026-07-05T03:17:59Z"},{"alias_kind":"pith_short_12","alias_value":"D2ZIETJDEHPJ","created_at":"2026-07-05T03:17:59Z"},{"alias_kind":"pith_short_16","alias_value":"D2ZIETJDEHPJ74MG","created_at":"2026-07-05T03:17:59Z"},{"alias_kind":"pith_short_8","alias_value":"D2ZIETJD","created_at":"2026-07-05T03:17:59Z"}],"graph_snapshots":[{"event_id":"sha256:efe07f8ab4f6f3c0e1fd719748b54970d72cff6c64485177d1f34ba3302b03ab","target":"graph","created_at":"2026-07-05T03:17:59Z","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/2109.07535/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We use a 3D radiative non-ideal magnetohydrodynamic (MHD) simulation to investigate the formation and evolution of a young protostellar disc from a magnetized pre-stellar core. The simulation covers the first ${\\sim}10~{\\rm kyr}$ after protostar formation, and shows a massive, weakly magnetized disc with radius that initially grows and then saturates at ${\\sim}30~{\\rm au}$. The disc is gravitationally unstable with prominent large-amplitude spiral arms. We use our simulation results and a series of physical arguments to construct a predictive and quantitative physical picture of Class 0/I prot","authors_text":"Matthew W. Kunz, Wenrui Xu","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2021-09-15T19:02:41Z","title":"Formation and evolution of protostellar accretion discs. II. From 3D simulation to a simple semi-analytic model of Class 0/I discs"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2109.07535","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":"sha256:375f4792e8f737c8e2b7bbba0a16cf228165374f231a3f8dbe62d0ea7f1949e1","target":"record","created_at":"2026-07-05T03:17:59Z","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":"e7dffe98c8f6c37ae1cae4c9be607e1c042dfd6be4b5a1188908eb5a20cde837","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2021-09-15T19:02:41Z","title_canon_sha256":"bf838cb05f0689b32f94b78a44320f8983cea3a0e4e1125995187fadcaffe6db"},"schema_version":"1.0","source":{"id":"2109.07535","kind":"arxiv","version":1}},"canonical_sha256":"1eb2824d2321de9ff18693f8796895c1ea7fef99dc785a06521a15acc3cf8ee3","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"1eb2824d2321de9ff18693f8796895c1ea7fef99dc785a06521a15acc3cf8ee3","first_computed_at":"2026-07-05T03:17:59.695093Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T03:17:59.695093Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"1/f0B/uvDuymxZ3jtb1UexvtBiXMUprmHUnl6odJSMhTPsVMeogeN82rJa2KMk9vdQNSxW84kU5T0XvF9vP7Cw==","signature_status":"signed_v1","signed_at":"2026-07-05T03:17:59.695438Z","signed_message":"canonical_sha256_bytes"},"source_id":"2109.07535","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:375f4792e8f737c8e2b7bbba0a16cf228165374f231a3f8dbe62d0ea7f1949e1","sha256:efe07f8ab4f6f3c0e1fd719748b54970d72cff6c64485177d1f34ba3302b03ab"],"state_sha256":"71b8ba262c629f05e17aad8fec5903a946e3c544fb573820c2f5917df2e1758e"}