{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2014:KNIJH3KT6HJHTYR4TV2GTS7MKG","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":"2ede51b77aebc91b82140813289963cebd3775813650dc863fe73b1a99003aa2","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2014-08-12T09:13:18Z","title_canon_sha256":"88592245b37f1137d3b6422aea393e59640971bff65f1122186e7caa59e655ca"},"schema_version":"1.0","source":{"id":"1408.2668","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1408.2668","created_at":"2026-05-18T02:42:05Z"},{"alias_kind":"arxiv_version","alias_value":"1408.2668v2","created_at":"2026-05-18T02:42:05Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1408.2668","created_at":"2026-05-18T02:42:05Z"},{"alias_kind":"pith_short_12","alias_value":"KNIJH3KT6HJH","created_at":"2026-05-18T12:28:35Z"},{"alias_kind":"pith_short_16","alias_value":"KNIJH3KT6HJHTYR4","created_at":"2026-05-18T12:28:35Z"},{"alias_kind":"pith_short_8","alias_value":"KNIJH3KT","created_at":"2026-05-18T12:28:35Z"}],"graph_snapshots":[{"event_id":"sha256:f69814260bcc357189d99d4e193f4c8acbafb5b3eb214dd751b970a50e70a658","target":"graph","created_at":"2026-05-18T02:42:05Z","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":"Understanding the physical conditions of dark molecular clouds and star forming regions is an inverse problem subject to complicated chemistry that varies non-linearly with time and the physical environment. In this paper we apply a Bayesian approach based on a Markov Chain Monte Carlo (MCMC) method for solving the non-linear inverse problems encountered in astrochemical modelling. We use observations for ice and gas species in dark molecular clouds and a time dependent, gas grain chemical model to infer the values of the physical and chemical parameters that characterize quiescent regions of ","authors_text":"Antonios Makrymallis, Serena Viti","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2014-08-12T09:13:18Z","title":"Understanding the Formation and Evolution of Interstellar Ices: A Bayesian Approach"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1408.2668","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:d4ae5277ba8ccb7624f839073d56f480df65f261e966dff6dd7fe973ed883a7b","target":"record","created_at":"2026-05-18T02:42:05Z","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":"2ede51b77aebc91b82140813289963cebd3775813650dc863fe73b1a99003aa2","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2014-08-12T09:13:18Z","title_canon_sha256":"88592245b37f1137d3b6422aea393e59640971bff65f1122186e7caa59e655ca"},"schema_version":"1.0","source":{"id":"1408.2668","kind":"arxiv","version":2}},"canonical_sha256":"535093ed53f1d279e23c9d7469cbec51b587689fd082a5ea4f322b42058a6c15","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"535093ed53f1d279e23c9d7469cbec51b587689fd082a5ea4f322b42058a6c15","first_computed_at":"2026-05-18T02:42:05.704224Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:42:05.704224Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"FWFXdz5S3IUtJrrb4BNffwfY7WmshJJJdcyqBquwimjVM4M+4dJ7YXyMRcy8A9ID2h+DMq+0oAhn1yNcBsxEDg==","signature_status":"signed_v1","signed_at":"2026-05-18T02:42:05.704661Z","signed_message":"canonical_sha256_bytes"},"source_id":"1408.2668","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:d4ae5277ba8ccb7624f839073d56f480df65f261e966dff6dd7fe973ed883a7b","sha256:f69814260bcc357189d99d4e193f4c8acbafb5b3eb214dd751b970a50e70a658"],"state_sha256":"16dfc37f62ea51082a03cdf667e5c96951b1fa19ca4852ea38f9d996dbf84715"}