{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2007:MDZYKSMRLO3FNOX2WVWDOSAQXP","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":"4b69b2b02faa46201f497c6e8fbb66c1c39b07daf68b06f137838a1b3ec5adee","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2007-01-29T16:41:13Z","title_canon_sha256":"ae79242ccbdf95cce1a9718ecb1344bbb418c1ab9d53399f4366e35349af0824"},"schema_version":"1.0","source":{"id":"astro-ph/0701803","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/0701803","created_at":"2026-07-04T15:16:32Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0701803v1","created_at":"2026-07-04T15:16:32Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0701803","created_at":"2026-07-04T15:16:32Z"},{"alias_kind":"pith_short_12","alias_value":"MDZYKSMRLO3F","created_at":"2026-07-04T15:16:32Z"},{"alias_kind":"pith_short_16","alias_value":"MDZYKSMRLO3FNOX2","created_at":"2026-07-04T15:16:32Z"},{"alias_kind":"pith_short_8","alias_value":"MDZYKSMR","created_at":"2026-07-04T15:16:32Z"}],"graph_snapshots":[{"event_id":"sha256:d7c8d21e5872cdc874ab40e1ddba7c2f49863906e564777ae79a6c00493427d4","target":"graph","created_at":"2026-07-04T15:16:32Z","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/astro-ph/0701803/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We consider observational and theoretical estimates of the accretion disc viscosity parameter $\\alpha$. We find that in thin, fully-ionized discs, the best observational evidence suggests a typical range $\\alpha \\sim 0.1 - 0.4$, whereas the relevant numerical simulations tend to derive estimates for $\\alpha$ which are an order of magnitude smaller. We discuss possible reasons for this apparent discrepancy.","authors_text":"A. R. King, J. E. Pringle & M. Livio","cross_cats":[],"headline":"","license":"","primary_cat":"astro-ph","submitted_at":"2007-01-29T16:41:13Z","title":"Accretion disc viscosity: how big is alpha?"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0701803","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":"sha256:7bd573f2552cafc53d421c417d6e681461b036b8f15b6a51a460aec7f2474b97","target":"record","created_at":"2026-07-04T15:16:32Z","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":"4b69b2b02faa46201f497c6e8fbb66c1c39b07daf68b06f137838a1b3ec5adee","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2007-01-29T16:41:13Z","title_canon_sha256":"ae79242ccbdf95cce1a9718ecb1344bbb418c1ab9d53399f4366e35349af0824"},"schema_version":"1.0","source":{"id":"astro-ph/0701803","kind":"arxiv","version":1}},"canonical_sha256":"60f38549915bb656bafab56c374810bbd2b853d58b792270bde649aa6d74f3de","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"60f38549915bb656bafab56c374810bbd2b853d58b792270bde649aa6d74f3de","first_computed_at":"2026-07-04T15:16:32.554893Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T15:16:32.554893Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"IX+A91/opzkQXu9q+zWqarEHKGKLKMIcqbwx5AqWIVQi3x8HUSk+qJS6KPeJ9WIMBPsfALADbl4AS7N5tErSDQ==","signature_status":"signed_v1","signed_at":"2026-07-04T15:16:32.555343Z","signed_message":"canonical_sha256_bytes"},"source_id":"astro-ph/0701803","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:7bd573f2552cafc53d421c417d6e681461b036b8f15b6a51a460aec7f2474b97","sha256:d7c8d21e5872cdc874ab40e1ddba7c2f49863906e564777ae79a6c00493427d4"],"state_sha256":"f033c218ffb7a539f2ff25a8b9ab646620681cf2d992516d61c06ea84f9a29b1"}