{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2012:JODPHN2GVOPYKS3LBSSK4V7FYT","short_pith_number":"pith:JODPHN2G","schema_version":"1.0","canonical_sha256":"4b86f3b746ab9f854b6b0ca4ae57e5c4f635e00959ef07fa4782b3d098272453","source":{"kind":"arxiv","id":"1202.6365","version":1},"attestation_state":"computed","paper":{"title":"Searching for variations in the fine-structure constant and the proton-to-electron mass ratio using quasar absorption lines","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["gr-qc","hep-ph","physics.atom-ph"],"primary_cat":"astro-ph.CO","authors_text":"Julian A. King","submitted_at":"2012-02-28T21:00:01Z","abstract_excerpt":"(abridged) Quasar absorption lines provide a precise test of the assumed constancy of the fundamental constants of physics. We have investigated potential changes in the fine-structure constant, alpha, and the proton-to-electron mass ratio, mu.\n  The many-multiplet method allows one to use optical fine-structure transitions to constrain (Delta alpha)/alpha at better than the 10^(-5) level. We present a new analysis of 154 quasar absorbers with 0.2 < z <3.7 in VLT/UVES spectra. From these absorbers we find 2.2 sigma evidence for angular variations in alpha under a dipole+monopole model. Combine"},"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":"1202.6365","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2012-02-28T21:00:01Z","cross_cats_sorted":["gr-qc","hep-ph","physics.atom-ph"],"title_canon_sha256":"353ba561005462852d2be234709b9de5164adc3c702d86f27621248a55423b49","abstract_canon_sha256":"b647226350e2c14ca29e4409107e31f8a8d65b009ed670dfd4579626e55b8a6a"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T04:01:12.769203Z","signature_b64":"Iu4qC3PkNWS9SrXpxJbxjfuta3TMVcyNrVfrV5N6ppybI0PFUvozQSYC8fVmDRlCqkLr3WM0lS87dON5Weq4AA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"4b86f3b746ab9f854b6b0ca4ae57e5c4f635e00959ef07fa4782b3d098272453","last_reissued_at":"2026-05-18T04:01:12.768532Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T04:01:12.768532Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Searching for variations in the fine-structure constant and the proton-to-electron mass ratio using quasar absorption lines","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["gr-qc","hep-ph","physics.atom-ph"],"primary_cat":"astro-ph.CO","authors_text":"Julian A. King","submitted_at":"2012-02-28T21:00:01Z","abstract_excerpt":"(abridged) Quasar absorption lines provide a precise test of the assumed constancy of the fundamental constants of physics. We have investigated potential changes in the fine-structure constant, alpha, and the proton-to-electron mass ratio, mu.\n  The many-multiplet method allows one to use optical fine-structure transitions to constrain (Delta alpha)/alpha at better than the 10^(-5) level. We present a new analysis of 154 quasar absorbers with 0.2 < z <3.7 in VLT/UVES spectra. From these absorbers we find 2.2 sigma evidence for angular variations in alpha under a dipole+monopole model. Combine"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1202.6365","kind":"arxiv","version":1},"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":"1202.6365","created_at":"2026-05-18T04:01:12.768619+00:00"},{"alias_kind":"arxiv_version","alias_value":"1202.6365v1","created_at":"2026-05-18T04:01:12.768619+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1202.6365","created_at":"2026-05-18T04:01:12.768619+00:00"},{"alias_kind":"pith_short_12","alias_value":"JODPHN2GVOPY","created_at":"2026-05-18T12:27:11.947152+00:00"},{"alias_kind":"pith_short_16","alias_value":"JODPHN2GVOPYKS3L","created_at":"2026-05-18T12:27:11.947152+00:00"},{"alias_kind":"pith_short_8","alias_value":"JODPHN2G","created_at":"2026-05-18T12:27:11.947152+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/JODPHN2GVOPYKS3LBSSK4V7FYT","json":"https://pith.science/pith/JODPHN2GVOPYKS3LBSSK4V7FYT.json","graph_json":"https://pith.science/api/pith-number/JODPHN2GVOPYKS3LBSSK4V7FYT/graph.json","events_json":"https://pith.science/api/pith-number/JODPHN2GVOPYKS3LBSSK4V7FYT/events.json","paper":"https://pith.science/paper/JODPHN2G"},"agent_actions":{"view_html":"https://pith.science/pith/JODPHN2GVOPYKS3LBSSK4V7FYT","download_json":"https://pith.science/pith/JODPHN2GVOPYKS3LBSSK4V7FYT.json","view_paper":"https://pith.science/paper/JODPHN2G","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1202.6365&json=true","fetch_graph":"https://pith.science/api/pith-number/JODPHN2GVOPYKS3LBSSK4V7FYT/graph.json","fetch_events":"https://pith.science/api/pith-number/JODPHN2GVOPYKS3LBSSK4V7FYT/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/JODPHN2GVOPYKS3LBSSK4V7FYT/action/timestamp_anchor","attest_storage":"https://pith.science/pith/JODPHN2GVOPYKS3LBSSK4V7FYT/action/storage_attestation","attest_author":"https://pith.science/pith/JODPHN2GVOPYKS3LBSSK4V7FYT/action/author_attestation","sign_citation":"https://pith.science/pith/JODPHN2GVOPYKS3LBSSK4V7FYT/action/citation_signature","submit_replication":"https://pith.science/pith/JODPHN2GVOPYKS3LBSSK4V7FYT/action/replication_record"}},"created_at":"2026-05-18T04:01:12.768619+00:00","updated_at":"2026-05-18T04:01:12.768619+00:00"}