{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2003:2UW4LMSJJOHGFQAFFM7EQMSGMC","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":"b1c0eca4b6ca2f2e8c35c2956a7d5386cb8a2449e842d1b62c06099872b9911e","cross_cats_sorted":[],"license":"","primary_cat":"physics.atom-ph","submitted_at":"2003-11-26T13:33:31Z","title_canon_sha256":"e543c68ec59486a5c0fb5c3329c79d475b72497f19acc7e9b54d7da164bd3206"},"schema_version":"1.0","source":{"id":"physics/0311128","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"physics/0311128","created_at":"2026-05-18T00:36:52Z"},{"alias_kind":"arxiv_version","alias_value":"physics/0311128v2","created_at":"2026-05-18T00:36:52Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.physics/0311128","created_at":"2026-05-18T00:36:52Z"},{"alias_kind":"pith_short_12","alias_value":"2UW4LMSJJOHG","created_at":"2026-05-18T12:25:51Z"},{"alias_kind":"pith_short_16","alias_value":"2UW4LMSJJOHGFQAF","created_at":"2026-05-18T12:25:51Z"},{"alias_kind":"pith_short_8","alias_value":"2UW4LMSJ","created_at":"2026-05-18T12:25:51Z"}],"graph_snapshots":[{"event_id":"sha256:018cda2187c0b9615f13994267ef04975ea9617abb762ee4aef7f6b8e72f8c9f","target":"graph","created_at":"2026-05-18T00:36:52Z","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":"In 2003 we have measured the absolute frequency of the $(1S, F=1, m_F=\\pm 1) \\leftrightarrow (2S, F'=1, m_F'=\\pm 1)$ two-photon transition in atomic hydrogen. We observed a variation of $(-29\\pm 57)$ Hz over a 44 months interval separating this measurement from the previous one performed in 1999. We have combined this result with recently published results of optical transition frequency measurement in the $^{199}$Hg$^+$ ion and and comparison between clocks based on $^{87}$Rb and $^{133}$Cs. From this combination we deduce the stringent limits for fractional time variation of the fine structu","authors_text":"A. Clairon, C. Salomon, F. Pereira Dos Santos, G. Santarelli, H. Marion, I. Maksimovic, J. Gr\\\"unert, M. Abgrall, M. Fischer, M. Zimmermann, N.Kolachevsky, P. Laurent, P. Lemonde, R. Holzwarth, S. Bize, Th. Udem, T.W. H\\\"ansch","cross_cats":[],"headline":"","license":"","primary_cat":"physics.atom-ph","submitted_at":"2003-11-26T13:33:31Z","title":"Precision Spectroscopy of Atomic Hydrogen and Variations of Fundamental Constants"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"physics/0311128","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:babf9425a46bb78c8b65390838860018b7e7f352927316267fc1224b2bc6023a","target":"record","created_at":"2026-05-18T00:36:52Z","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":"b1c0eca4b6ca2f2e8c35c2956a7d5386cb8a2449e842d1b62c06099872b9911e","cross_cats_sorted":[],"license":"","primary_cat":"physics.atom-ph","submitted_at":"2003-11-26T13:33:31Z","title_canon_sha256":"e543c68ec59486a5c0fb5c3329c79d475b72497f19acc7e9b54d7da164bd3206"},"schema_version":"1.0","source":{"id":"physics/0311128","kind":"arxiv","version":2}},"canonical_sha256":"d52dc5b2494b8e62c0052b3e48324660a126b8f2139f3317c81da3484f7492cc","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"d52dc5b2494b8e62c0052b3e48324660a126b8f2139f3317c81da3484f7492cc","first_computed_at":"2026-05-18T00:36:52.527767Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:36:52.527767Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"/mwUbS6OqM4d805IWTooO8ePFZqUXxIhVTudkhXGLLcqiYn7PZyJkCedoNtrGvGwTLqxyCQqmgM5pqvM82vMDw==","signature_status":"signed_v1","signed_at":"2026-05-18T00:36:52.528310Z","signed_message":"canonical_sha256_bytes"},"source_id":"physics/0311128","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:babf9425a46bb78c8b65390838860018b7e7f352927316267fc1224b2bc6023a","sha256:018cda2187c0b9615f13994267ef04975ea9617abb762ee4aef7f6b8e72f8c9f"],"state_sha256":"ccaac4bb2067fa921bae7527a164193a78e47bac7974e86be4a58cd9cd1f6051"}