{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:NTKFWDQKTO6HEI2SJ7JKA56UQR","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":"cd0c8dab79dc4f47e88c114cd3cb587090ca5040ca6c07a3fa0f448662f0b536","cross_cats_sorted":["gr-qc","hep-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2019-07-03T20:05:30Z","title_canon_sha256":"67fc4d68ab36c993e13f6aa8568a8923ccab67d293566a41b415d10fccfbdbe0"},"schema_version":"1.0","source":{"id":"1907.02118","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1907.02118","created_at":"2026-07-05T01:14:26Z"},{"alias_kind":"arxiv_version","alias_value":"1907.02118v1","created_at":"2026-07-05T01:14:26Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1907.02118","created_at":"2026-07-05T01:14:26Z"},{"alias_kind":"pith_short_12","alias_value":"NTKFWDQKTO6H","created_at":"2026-07-05T01:14:26Z"},{"alias_kind":"pith_short_16","alias_value":"NTKFWDQKTO6HEI2S","created_at":"2026-07-05T01:14:26Z"},{"alias_kind":"pith_short_8","alias_value":"NTKFWDQK","created_at":"2026-07-05T01:14:26Z"}],"graph_snapshots":[{"event_id":"sha256:5eb3631d659f6ab10127f4c6871a109c32eea2937508cb18fbb17048a3c0fcfb","target":"graph","created_at":"2026-07-05T01:14:26Z","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/1907.02118/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"The possibility of variation of the fundamental constants of nature has been a long-standing question, with important consequences for fundamental physics and cosmology. In particular, it has been shown that variations in the fine-structure constant, $\\alpha$, are directly related to violation of the distance duality relation (DDR), which holds true as long as photons travel on unique null geodesics and their number is conserved. In this paper we use the currently available measurements of ${\\Delta \\alpha}/{\\alpha}$ to impose the most stringent constraints on departures of the DDR to date, her","authors_text":"Jailson S. Alcaniz, Rodrigo F. L. Holanda, Rodrigo S. Gon\\c{c}alves, Susana Landau","cross_cats":["gr-qc","hep-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2019-07-03T20:05:30Z","title":"Variation in the fine-structure constant, distance-duality relation and the next generation of high-resolution spectrograph"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1907.02118","kind":"arxiv","version":1},"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":"sha256:2d8f5dddc9881c3b89fbbe163d21a1516c30692453e67189072325b81fd59f64","target":"record","created_at":"2026-07-05T01:14:26Z","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":"cd0c8dab79dc4f47e88c114cd3cb587090ca5040ca6c07a3fa0f448662f0b536","cross_cats_sorted":["gr-qc","hep-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2019-07-03T20:05:30Z","title_canon_sha256":"67fc4d68ab36c993e13f6aa8568a8923ccab67d293566a41b415d10fccfbdbe0"},"schema_version":"1.0","source":{"id":"1907.02118","kind":"arxiv","version":1}},"canonical_sha256":"6cd45b0e0a9bbc7223524fd2a077d4844f681599be2c954d960395be06ea7888","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"6cd45b0e0a9bbc7223524fd2a077d4844f681599be2c954d960395be06ea7888","first_computed_at":"2026-07-05T01:14:26.287893Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T01:14:26.287893Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"/tvadf1uxkzAYrtdln2I/d9Pv1SuN9bNHi0eRpHjEX1ozNXtHCz+KoYAZ7lSK85cU26rrMfnFcbnN5jsHNLRDw==","signature_status":"signed_v1","signed_at":"2026-07-05T01:14:26.288273Z","signed_message":"canonical_sha256_bytes"},"source_id":"1907.02118","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:2d8f5dddc9881c3b89fbbe163d21a1516c30692453e67189072325b81fd59f64","sha256:5eb3631d659f6ab10127f4c6871a109c32eea2937508cb18fbb17048a3c0fcfb"],"state_sha256":"13adf28e1c9bf57cdbba874f88260850ad36849a5ce5f4e0f1f144224d9de726"}