{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:2V5U3LK3P56SD32NM5RTCSY3D6","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":"a65f368129fb9626b687caf8391d13a04021837568576203588a0d3dbd697871","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2012-11-18T20:00:47Z","title_canon_sha256":"40f1e0a258cf3c8d11c0da69ad90d6d91fcb98062b6d5ab8f303ee35b09530c4"},"schema_version":"1.0","source":{"id":"1211.4253","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1211.4253","created_at":"2026-05-18T01:53:03Z"},{"alias_kind":"arxiv_version","alias_value":"1211.4253v2","created_at":"2026-05-18T01:53:03Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1211.4253","created_at":"2026-05-18T01:53:03Z"},{"alias_kind":"pith_short_12","alias_value":"2V5U3LK3P56S","created_at":"2026-05-18T12:26:50Z"},{"alias_kind":"pith_short_16","alias_value":"2V5U3LK3P56SD32N","created_at":"2026-05-18T12:26:50Z"},{"alias_kind":"pith_short_8","alias_value":"2V5U3LK3","created_at":"2026-05-18T12:26:50Z"}],"graph_snapshots":[{"event_id":"sha256:e505ec11e61868a1e70cd25829c569765492f10b7b980e151ce79ebbcf396d86","target":"graph","created_at":"2026-05-18T01:53:03Z","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":"We use 21 Hubble parameter versus redshift data points, from Gazta\\~{n}aga et al. (2009), Stern et al. (2010), and Moresco et al. (2012), to place constraints on model parameters of constant and time-evolving dark energy cosmologies. This is the largest set of H(z) data considered to date. The inclusion of the 8 new Moresco et al. (2012) measurements results in H(z) constraints more restrictive than those derived by Chen & Ratra (2011b). These constraints are now almost as restrictive as those that follow from current Type Ia supernova (SNIa) apparent magnitude versus redshift data (Suzuki et ","authors_text":"Bharat Ratra, Data Mania, Omer Farooq","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2012-11-18T20:00:47Z","title":"Hubble parameter measurement constraints on dark energy"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1211.4253","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":"sha256:05233ec9b6fb3a4c91d223c7e50d1ae87253e00b7677cd59abc7ac6093e1a8e4","target":"record","created_at":"2026-05-18T01:53:03Z","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":"a65f368129fb9626b687caf8391d13a04021837568576203588a0d3dbd697871","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2012-11-18T20:00:47Z","title_canon_sha256":"40f1e0a258cf3c8d11c0da69ad90d6d91fcb98062b6d5ab8f303ee35b09530c4"},"schema_version":"1.0","source":{"id":"1211.4253","kind":"arxiv","version":2}},"canonical_sha256":"d57b4dad5b7f7d21ef4d6763314b1b1f9a749488d91527fce683482bea22c341","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"d57b4dad5b7f7d21ef4d6763314b1b1f9a749488d91527fce683482bea22c341","first_computed_at":"2026-05-18T01:53:03.196954Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:53:03.196954Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"8mq0aL9hla+CdaWS/+kr7aoQRvap9t39sFJ+0WdgZHzYdCHJmaE7/n8pmqEBZYHRCDy5aI17GTQJIIOvKrI2Cg==","signature_status":"signed_v1","signed_at":"2026-05-18T01:53:03.197672Z","signed_message":"canonical_sha256_bytes"},"source_id":"1211.4253","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:05233ec9b6fb3a4c91d223c7e50d1ae87253e00b7677cd59abc7ac6093e1a8e4","sha256:e505ec11e61868a1e70cd25829c569765492f10b7b980e151ce79ebbcf396d86"],"state_sha256":"bfd857c90fda7930fbe9432e199b1d2211c5968e736103c7cb7e413b466ab3b0"}