{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2003:2UW4LMSJJOHGFQAFFM7EQMSGMC","short_pith_number":"pith:2UW4LMSJ","schema_version":"1.0","canonical_sha256":"d52dc5b2494b8e62c0052b3e48324660a126b8f2139f3317c81da3484f7492cc","source":{"kind":"arxiv","id":"physics/0311128","version":2},"attestation_state":"computed","paper":{"title":"Precision Spectroscopy of Atomic Hydrogen and Variations of Fundamental Constants","license":"","headline":"","cross_cats":[],"primary_cat":"physics.atom-ph","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","submitted_at":"2003-11-26T13:33:31Z","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"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"physics/0311128","kind":"arxiv","version":2},"metadata":{"license":"","primary_cat":"physics.atom-ph","submitted_at":"2003-11-26T13:33:31Z","cross_cats_sorted":[],"title_canon_sha256":"e543c68ec59486a5c0fb5c3329c79d475b72497f19acc7e9b54d7da164bd3206","abstract_canon_sha256":"b1c0eca4b6ca2f2e8c35c2956a7d5386cb8a2449e842d1b62c06099872b9911e"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:36:52.528310Z","signature_b64":"/mwUbS6OqM4d805IWTooO8ePFZqUXxIhVTudkhXGLLcqiYn7PZyJkCedoNtrGvGwTLqxyCQqmgM5pqvM82vMDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"d52dc5b2494b8e62c0052b3e48324660a126b8f2139f3317c81da3484f7492cc","last_reissued_at":"2026-05-18T00:36:52.527767Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:36:52.527767Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Precision Spectroscopy of Atomic Hydrogen and Variations of Fundamental Constants","license":"","headline":"","cross_cats":[],"primary_cat":"physics.atom-ph","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","submitted_at":"2003-11-26T13:33:31Z","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"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"physics/0311128","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"aliases":[{"alias_kind":"arxiv","alias_value":"physics/0311128","created_at":"2026-05-18T00:36:52.527848+00:00"},{"alias_kind":"arxiv_version","alias_value":"physics/0311128v2","created_at":"2026-05-18T00:36:52.527848+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.physics/0311128","created_at":"2026-05-18T00:36:52.527848+00:00"},{"alias_kind":"pith_short_12","alias_value":"2UW4LMSJJOHG","created_at":"2026-05-18T12:25:51.375804+00:00"},{"alias_kind":"pith_short_16","alias_value":"2UW4LMSJJOHGFQAF","created_at":"2026-05-18T12:25:51.375804+00:00"},{"alias_kind":"pith_short_8","alias_value":"2UW4LMSJ","created_at":"2026-05-18T12:25:51.375804+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/2UW4LMSJJOHGFQAFFM7EQMSGMC","json":"https://pith.science/pith/2UW4LMSJJOHGFQAFFM7EQMSGMC.json","graph_json":"https://pith.science/api/pith-number/2UW4LMSJJOHGFQAFFM7EQMSGMC/graph.json","events_json":"https://pith.science/api/pith-number/2UW4LMSJJOHGFQAFFM7EQMSGMC/events.json","paper":"https://pith.science/paper/2UW4LMSJ"},"agent_actions":{"view_html":"https://pith.science/pith/2UW4LMSJJOHGFQAFFM7EQMSGMC","download_json":"https://pith.science/pith/2UW4LMSJJOHGFQAFFM7EQMSGMC.json","view_paper":"https://pith.science/paper/2UW4LMSJ","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=physics/0311128&json=true","fetch_graph":"https://pith.science/api/pith-number/2UW4LMSJJOHGFQAFFM7EQMSGMC/graph.json","fetch_events":"https://pith.science/api/pith-number/2UW4LMSJJOHGFQAFFM7EQMSGMC/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/2UW4LMSJJOHGFQAFFM7EQMSGMC/action/timestamp_anchor","attest_storage":"https://pith.science/pith/2UW4LMSJJOHGFQAFFM7EQMSGMC/action/storage_attestation","attest_author":"https://pith.science/pith/2UW4LMSJJOHGFQAFFM7EQMSGMC/action/author_attestation","sign_citation":"https://pith.science/pith/2UW4LMSJJOHGFQAFFM7EQMSGMC/action/citation_signature","submit_replication":"https://pith.science/pith/2UW4LMSJJOHGFQAFFM7EQMSGMC/action/replication_record"}},"created_at":"2026-05-18T00:36:52.527848+00:00","updated_at":"2026-05-18T00:36:52.527848+00:00"}