{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:PJ6CDKNFKU4DFFI733YACCK5QD","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":"c0595a5a94dad62666140b7f2ea28998818a6cbd59a0b0c0ad70958b19398e5c","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2016-03-21T16:42:34Z","title_canon_sha256":"8ed18675fc631a09786eec3600b55f5d259556ed435104080a10ed207eae42b2"},"schema_version":"1.0","source":{"id":"1603.06489","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1603.06489","created_at":"2026-05-18T01:13:53Z"},{"alias_kind":"arxiv_version","alias_value":"1603.06489v1","created_at":"2026-05-18T01:13:53Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1603.06489","created_at":"2026-05-18T01:13:53Z"},{"alias_kind":"pith_short_12","alias_value":"PJ6CDKNFKU4D","created_at":"2026-05-18T12:30:39Z"},{"alias_kind":"pith_short_16","alias_value":"PJ6CDKNFKU4DFFI7","created_at":"2026-05-18T12:30:39Z"},{"alias_kind":"pith_short_8","alias_value":"PJ6CDKNF","created_at":"2026-05-18T12:30:39Z"}],"graph_snapshots":[{"event_id":"sha256:50a9c71ff12f936bc0f263336c0fb64c359deecfe7e31c82c6bee2a0822a2bef","target":"graph","created_at":"2026-05-18T01:13:53Z","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":"Much of astrophysics consists of the study of ionised gas under the influence of gravitational and magnetic fields. Thus, it is not possible to understand the astrophysical universe without a detailed knowledge of the dynamics of magnetised fluids. Fluid dynamics is, however, a notoriously tricky subject, in which it is all too easy for one's a priori intuition to go astray. In this review, we seek to guide the reader through a series of illuminating yet deceptive problems, all with an enlightening twist. We cover a broad range of topics including the instabilities acting in accretion discs, t","authors_text":"Steven A. Balbus, William J. Potter","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2016-03-21T16:42:34Z","title":"Surprises in astrophysical gasdynamics"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1603.06489","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":"sha256:3a2309d1b9947420e7b46fb0daea3adf3bab652fa14c3324a53cacf22c0f439c","target":"record","created_at":"2026-05-18T01:13:53Z","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":"c0595a5a94dad62666140b7f2ea28998818a6cbd59a0b0c0ad70958b19398e5c","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2016-03-21T16:42:34Z","title_canon_sha256":"8ed18675fc631a09786eec3600b55f5d259556ed435104080a10ed207eae42b2"},"schema_version":"1.0","source":{"id":"1603.06489","kind":"arxiv","version":1}},"canonical_sha256":"7a7c21a9a5553832951fdef001095d80da9a9fdf5fdc1169f09f258788cabbfb","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"7a7c21a9a5553832951fdef001095d80da9a9fdf5fdc1169f09f258788cabbfb","first_computed_at":"2026-05-18T01:13:53.847490Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:13:53.847490Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"/bMTjaahkdYI6hj+yFEnPonSW8GhjVVKOHMhF0/v6fwx3hZLSF2Yo8WwkD0KqRcPTouW6wCVc/JVwx7plU7NCg==","signature_status":"signed_v1","signed_at":"2026-05-18T01:13:53.848163Z","signed_message":"canonical_sha256_bytes"},"source_id":"1603.06489","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:3a2309d1b9947420e7b46fb0daea3adf3bab652fa14c3324a53cacf22c0f439c","sha256:50a9c71ff12f936bc0f263336c0fb64c359deecfe7e31c82c6bee2a0822a2bef"],"state_sha256":"dee0311dcb87b7a20dfa6e38a543b07b8b2a20b728fa3004e23eb1d84cb0e64f"}