{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2016:Q3AKBM2IPVZSO6DCTHUNWDT5UV","short_pith_number":"pith:Q3AKBM2I","schema_version":"1.0","canonical_sha256":"86c0a0b3487d7327786299e8db0e7da55731795eecebe2123c887f56c95058c9","source":{"kind":"arxiv","id":"1609.03860","version":1},"attestation_state":"computed","paper":{"title":"High-precision limit on variation in the fine-structure constant from a single quasar absorption system","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.GA"],"primary_cat":"astro-ph.CO","authors_text":"(2) University of Cambridge), Michael T. Murphy (1), Robert F. Carswell (2) ((1) Swinburne University of Technology, Sr{\\dj}an M. Kotu\\v{s} (1)","submitted_at":"2016-09-13T14:33:57Z","abstract_excerpt":"The brightest southern quasar above redshift $z=1$, HE 0515$-$4414, with its strong intervening metal absorption-line system at $z_{abs}=1.1508$, provides a unique opportunity to precisely measure or limit relative variations in the fine-structure constant ($\\Delta\\alpha/\\alpha$). A variation of just $\\sim$3 parts per million (ppm) would produce detectable velocity shifts between its many strong metal transitions. Using new and archival observations from the Ultraviolet and Visual Echelle Spectrograph (UVES) we obtain an extremely high signal-to-noise ratio spectrum (peaking at S/N $\\approx250"},"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":"1609.03860","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2016-09-13T14:33:57Z","cross_cats_sorted":["astro-ph.GA"],"title_canon_sha256":"60538a9d365e7cbdf31c2aa75e2af80dff15764023db01bc4c1f2f9dba8b9539","abstract_canon_sha256":"13ffd25d8c6fe58076ace1de18759cad357d696a6e7b26bad98e016fb2288830"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:55:41.581483Z","signature_b64":"6oTwxTVlqqtbXsO4Ao42dIpIFVFCF3O7mIMkuDKJb79uOqV0N15ebvRMFPKReWNIDIxcsCmMXqyR18K387SIAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"86c0a0b3487d7327786299e8db0e7da55731795eecebe2123c887f56c95058c9","last_reissued_at":"2026-05-18T00:55:41.581020Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:55:41.581020Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"High-precision limit on variation in the fine-structure constant from a single quasar absorption system","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.GA"],"primary_cat":"astro-ph.CO","authors_text":"(2) University of Cambridge), Michael T. Murphy (1), Robert F. Carswell (2) ((1) Swinburne University of Technology, Sr{\\dj}an M. Kotu\\v{s} (1)","submitted_at":"2016-09-13T14:33:57Z","abstract_excerpt":"The brightest southern quasar above redshift $z=1$, HE 0515$-$4414, with its strong intervening metal absorption-line system at $z_{abs}=1.1508$, provides a unique opportunity to precisely measure or limit relative variations in the fine-structure constant ($\\Delta\\alpha/\\alpha$). A variation of just $\\sim$3 parts per million (ppm) would produce detectable velocity shifts between its many strong metal transitions. Using new and archival observations from the Ultraviolet and Visual Echelle Spectrograph (UVES) we obtain an extremely high signal-to-noise ratio spectrum (peaking at S/N $\\approx250"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1609.03860","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":"1609.03860","created_at":"2026-05-18T00:55:41.581090+00:00"},{"alias_kind":"arxiv_version","alias_value":"1609.03860v1","created_at":"2026-05-18T00:55:41.581090+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1609.03860","created_at":"2026-05-18T00:55:41.581090+00:00"},{"alias_kind":"pith_short_12","alias_value":"Q3AKBM2IPVZS","created_at":"2026-05-18T12:30:39.010887+00:00"},{"alias_kind":"pith_short_16","alias_value":"Q3AKBM2IPVZSO6DC","created_at":"2026-05-18T12:30:39.010887+00:00"},{"alias_kind":"pith_short_8","alias_value":"Q3AKBM2I","created_at":"2026-05-18T12:30:39.010887+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":2,"internal_anchor_count":0,"sample":[{"citing_arxiv_id":"2605.06267","citing_title":"Revisiting the Constancy of the Speed of Light: Galaxy Cluster Mass Bias Implications","ref_index":7,"is_internal_anchor":false},{"citing_arxiv_id":"2604.08775","citing_title":"Colloquium: Radio astronomy with the Arecibo 305-m telescope: In contemporaneous context","ref_index":202,"is_internal_anchor":false}]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/Q3AKBM2IPVZSO6DCTHUNWDT5UV","json":"https://pith.science/pith/Q3AKBM2IPVZSO6DCTHUNWDT5UV.json","graph_json":"https://pith.science/api/pith-number/Q3AKBM2IPVZSO6DCTHUNWDT5UV/graph.json","events_json":"https://pith.science/api/pith-number/Q3AKBM2IPVZSO6DCTHUNWDT5UV/events.json","paper":"https://pith.science/paper/Q3AKBM2I"},"agent_actions":{"view_html":"https://pith.science/pith/Q3AKBM2IPVZSO6DCTHUNWDT5UV","download_json":"https://pith.science/pith/Q3AKBM2IPVZSO6DCTHUNWDT5UV.json","view_paper":"https://pith.science/paper/Q3AKBM2I","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1609.03860&json=true","fetch_graph":"https://pith.science/api/pith-number/Q3AKBM2IPVZSO6DCTHUNWDT5UV/graph.json","fetch_events":"https://pith.science/api/pith-number/Q3AKBM2IPVZSO6DCTHUNWDT5UV/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/Q3AKBM2IPVZSO6DCTHUNWDT5UV/action/timestamp_anchor","attest_storage":"https://pith.science/pith/Q3AKBM2IPVZSO6DCTHUNWDT5UV/action/storage_attestation","attest_author":"https://pith.science/pith/Q3AKBM2IPVZSO6DCTHUNWDT5UV/action/author_attestation","sign_citation":"https://pith.science/pith/Q3AKBM2IPVZSO6DCTHUNWDT5UV/action/citation_signature","submit_replication":"https://pith.science/pith/Q3AKBM2IPVZSO6DCTHUNWDT5UV/action/replication_record"}},"created_at":"2026-05-18T00:55:41.581090+00:00","updated_at":"2026-05-18T00:55:41.581090+00:00"}