{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2000:VRWONIWXXIROWHC2QFSQMWARRD","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":"b424306ca1a0a856206f6767b73cf14d53ce095f15c5a044f4e2bf567aa50675","cross_cats_sorted":["gr-qc","hep-ph","hep-th","physics.atom-ph"],"license":"","primary_cat":"astro-ph","submitted_at":"2000-12-29T16:22:11Z","title_canon_sha256":"4f7a2bb0616960f145c190627d94e12eb32e49a0613c1e0f6b80862dd195cb56"},"schema_version":"1.0","source":{"id":"astro-ph/0012539","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/0012539","created_at":"2026-07-04T15:20:39Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0012539v3","created_at":"2026-07-04T15:20:39Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0012539","created_at":"2026-07-04T15:20:39Z"},{"alias_kind":"pith_short_12","alias_value":"VRWONIWXXIRO","created_at":"2026-07-04T15:20:39Z"},{"alias_kind":"pith_short_16","alias_value":"VRWONIWXXIROWHC2","created_at":"2026-07-04T15:20:39Z"},{"alias_kind":"pith_short_8","alias_value":"VRWONIWX","created_at":"2026-07-04T15:20:39Z"}],"graph_snapshots":[{"event_id":"sha256:af0e0bf0e6eff128a44b5f24461102a3cfd8fa61385d31d19640d309ec5aef53","target":"graph","created_at":"2026-07-04T15:20:39Z","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/0012539/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We describe the results of a search for time variability of the fine structure constant, alpha, using absorption systems in the spectra of distant quasars. Three large optical datasets and two 21cm/mm absorption systems provide four independent samples, spanning 23% to 87% of the age of the universe. Each sample yields a smaller alpha in the past and the optical sample shows a 4-sigma deviation: da/a = -0.72 +/- 0.18 x 10^{-5} over the redshift range 0.5 < z < 3.5. We find no systematic effects which can explain our results. The only potentially significant systematic effects push da/a towards","authors_text":"A.M. Wolfe, C.W. Churchill, J.D. Barrow, J.K. Webb, J.X. Prochaska, M.T. Murphy, V.A. Dzuba, V.V. Flambaum","cross_cats":["gr-qc","hep-ph","hep-th","physics.atom-ph"],"headline":"","license":"","primary_cat":"astro-ph","submitted_at":"2000-12-29T16:22:11Z","title":"Further Evidence for Cosmological Evolution of the Fine Structure Constant"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0012539","kind":"arxiv","version":3},"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:c84f71a253e3ac01c2b0605302ca68053afad2e68e74d8e390e5bdb1b9083e09","target":"record","created_at":"2026-07-04T15:20:39Z","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":"b424306ca1a0a856206f6767b73cf14d53ce095f15c5a044f4e2bf567aa50675","cross_cats_sorted":["gr-qc","hep-ph","hep-th","physics.atom-ph"],"license":"","primary_cat":"astro-ph","submitted_at":"2000-12-29T16:22:11Z","title_canon_sha256":"4f7a2bb0616960f145c190627d94e12eb32e49a0613c1e0f6b80862dd195cb56"},"schema_version":"1.0","source":{"id":"astro-ph/0012539","kind":"arxiv","version":3}},"canonical_sha256":"ac6ce6a2d7ba22eb1c5a816506581188f5f285df195c66d78a29bfb978dc6d12","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"ac6ce6a2d7ba22eb1c5a816506581188f5f285df195c66d78a29bfb978dc6d12","first_computed_at":"2026-07-04T15:20:39.079387Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T15:20:39.079387Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"vsbjgwE0dhJp1hnLFoofSBMMtlBmf3/d8pzGqkLM63QVMtQ61sZMnuotDzzY35PRRhS4HPbwz/f/SWh8EA1CCA==","signature_status":"signed_v1","signed_at":"2026-07-04T15:20:39.079784Z","signed_message":"canonical_sha256_bytes"},"source_id":"astro-ph/0012539","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:c84f71a253e3ac01c2b0605302ca68053afad2e68e74d8e390e5bdb1b9083e09","sha256:af0e0bf0e6eff128a44b5f24461102a3cfd8fa61385d31d19640d309ec5aef53"],"state_sha256":"6d189e021bbd8078085c1c240cf0864cc71d744fb949613da7993985ac9481c1"}