{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2005:L535WMIYSG5XBMKVJWFWRRORF2","short_pith_number":"pith:L535WMIY","canonical_record":{"source":{"id":"astro-ph/0501168","kind":"arxiv","version":2},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2005-01-10T21:00:47Z","cross_cats_sorted":[],"title_canon_sha256":"e93af2eadb68f907f4996155562393968e57ecc1b7c65bac278a3d5800096654","abstract_canon_sha256":"6a1f6ee37ceaa74442881cecd99e19ecba4d6922efda0463c2ea2c25c08f176c"},"schema_version":"1.0"},"canonical_sha256":"5f77db311891bb70b1554d8b68c5d12eaad31a1db95f2e6469c1010e078e7a62","source":{"kind":"arxiv","id":"astro-ph/0501168","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/0501168","created_at":"2026-07-04T15:20:15Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0501168v2","created_at":"2026-07-04T15:20:15Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0501168","created_at":"2026-07-04T15:20:15Z"},{"alias_kind":"pith_short_12","alias_value":"L535WMIYSG5X","created_at":"2026-07-04T15:20:15Z"},{"alias_kind":"pith_short_16","alias_value":"L535WMIYSG5XBMKV","created_at":"2026-07-04T15:20:15Z"},{"alias_kind":"pith_short_8","alias_value":"L535WMIY","created_at":"2026-07-04T15:20:15Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2005:L535WMIYSG5XBMKVJWFWRRORF2","target":"record","payload":{"canonical_record":{"source":{"id":"astro-ph/0501168","kind":"arxiv","version":2},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2005-01-10T21:00:47Z","cross_cats_sorted":[],"title_canon_sha256":"e93af2eadb68f907f4996155562393968e57ecc1b7c65bac278a3d5800096654","abstract_canon_sha256":"6a1f6ee37ceaa74442881cecd99e19ecba4d6922efda0463c2ea2c25c08f176c"},"schema_version":"1.0"},"canonical_sha256":"5f77db311891bb70b1554d8b68c5d12eaad31a1db95f2e6469c1010e078e7a62","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T15:20:15.092284Z","signature_b64":"m8JSG439LNIclcfwefSlcmp9AbZFhnCpCKPRqDN9XnxgNXEf6fMICBcYyZDwzeyUiJAt3gmTs0i/MZCAiCVlCg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"5f77db311891bb70b1554d8b68c5d12eaad31a1db95f2e6469c1010e078e7a62","last_reissued_at":"2026-07-04T15:20:15.091892Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T15:20:15.091892Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"astro-ph/0501168","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-04T15:20:15Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"XsTPXdFNgjjhDg5q2oGarQN2jBPruAIe6mfegZjQNqrUSywFUDqkXEs/cfXIQbSwpA4Tw0KzUS9beQ2omSeJBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-05T08:01:12.004703Z"},"content_sha256":"cf317b9a23725228035f2a2deee40254b70a8caacf8b6cf0b6aea3e54beb8d56","schema_version":"1.0","event_id":"sha256:cf317b9a23725228035f2a2deee40254b70a8caacf8b6cf0b6aea3e54beb8d56"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2005:L535WMIYSG5XBMKVJWFWRRORF2","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"On variations in the fine-structure constant and stellar pollution of quasar absorption systems","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"(2) IoA, B. K. Gibson (1) ((1) Swinburne University, Cambridge), M. T. Murphy (2), Y. Fenner (1)","submitted_at":"2005-01-10T21:00:47Z","abstract_excerpt":"At redshifts z_abs < 2, quasar absorption-line constraints on space-time variations in the fine-structure constant, alpha, rely on the comparison of MgII and FeII transition wavelengths. One potentially important uncertainty is the relative abundance of Mg isotopes in the absorbers which, if different from solar, can cause spurious shifts in the measured wavelengths and, therefore, alpha. Here we explore chemical evolution models with enhanced populations of intermediate-mass (IM) stars which, in their asymptotic giant branch (AGB) phase, are thought to be the dominant factories for heavy Mg i"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0501168","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/astro-ph/0501168/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-04T15:20:15Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"LhUSeiFl7uVn+h4qdfshu9NG7rkpSO9ooRgnsbVJdU+w34My1WhRPEpKuNlpJPJ60C0ulJQMUq9QEaWplCKeAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-05T08:01:12.005254Z"},"content_sha256":"15314163ab41dccda8a5c5bd4c3155b49ccc07ece47aa51c3c7f17608bff43bb","schema_version":"1.0","event_id":"sha256:15314163ab41dccda8a5c5bd4c3155b49ccc07ece47aa51c3c7f17608bff43bb"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/L535WMIYSG5XBMKVJWFWRRORF2/bundle.json","state_url":"https://pith.science/pith/L535WMIYSG5XBMKVJWFWRRORF2/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/L535WMIYSG5XBMKVJWFWRRORF2/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-08-05T08:01:12Z","links":{"resolver":"https://pith.science/pith/L535WMIYSG5XBMKVJWFWRRORF2","bundle":"https://pith.science/pith/L535WMIYSG5XBMKVJWFWRRORF2/bundle.json","state":"https://pith.science/pith/L535WMIYSG5XBMKVJWFWRRORF2/state.json","well_known_bundle":"https://pith.science/.well-known/pith/L535WMIYSG5XBMKVJWFWRRORF2/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2005:L535WMIYSG5XBMKVJWFWRRORF2","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":"6a1f6ee37ceaa74442881cecd99e19ecba4d6922efda0463c2ea2c25c08f176c","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2005-01-10T21:00:47Z","title_canon_sha256":"e93af2eadb68f907f4996155562393968e57ecc1b7c65bac278a3d5800096654"},"schema_version":"1.0","source":{"id":"astro-ph/0501168","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/0501168","created_at":"2026-07-04T15:20:15Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0501168v2","created_at":"2026-07-04T15:20:15Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0501168","created_at":"2026-07-04T15:20:15Z"},{"alias_kind":"pith_short_12","alias_value":"L535WMIYSG5X","created_at":"2026-07-04T15:20:15Z"},{"alias_kind":"pith_short_16","alias_value":"L535WMIYSG5XBMKV","created_at":"2026-07-04T15:20:15Z"},{"alias_kind":"pith_short_8","alias_value":"L535WMIY","created_at":"2026-07-04T15:20:15Z"}],"graph_snapshots":[{"event_id":"sha256:15314163ab41dccda8a5c5bd4c3155b49ccc07ece47aa51c3c7f17608bff43bb","target":"graph","created_at":"2026-07-04T15:20:15Z","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/astro-ph/0501168/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"At redshifts z_abs < 2, quasar absorption-line constraints on space-time variations in the fine-structure constant, alpha, rely on the comparison of MgII and FeII transition wavelengths. One potentially important uncertainty is the relative abundance of Mg isotopes in the absorbers which, if different from solar, can cause spurious shifts in the measured wavelengths and, therefore, alpha. Here we explore chemical evolution models with enhanced populations of intermediate-mass (IM) stars which, in their asymptotic giant branch (AGB) phase, are thought to be the dominant factories for heavy Mg i","authors_text":"(2) IoA, B. K. Gibson (1) ((1) Swinburne University, Cambridge), M. T. Murphy (2), Y. Fenner (1)","cross_cats":[],"headline":"","license":"","primary_cat":"astro-ph","submitted_at":"2005-01-10T21:00:47Z","title":"On variations in the fine-structure constant and stellar pollution of quasar absorption systems"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0501168","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:cf317b9a23725228035f2a2deee40254b70a8caacf8b6cf0b6aea3e54beb8d56","target":"record","created_at":"2026-07-04T15:20:15Z","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":"6a1f6ee37ceaa74442881cecd99e19ecba4d6922efda0463c2ea2c25c08f176c","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2005-01-10T21:00:47Z","title_canon_sha256":"e93af2eadb68f907f4996155562393968e57ecc1b7c65bac278a3d5800096654"},"schema_version":"1.0","source":{"id":"astro-ph/0501168","kind":"arxiv","version":2}},"canonical_sha256":"5f77db311891bb70b1554d8b68c5d12eaad31a1db95f2e6469c1010e078e7a62","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"5f77db311891bb70b1554d8b68c5d12eaad31a1db95f2e6469c1010e078e7a62","first_computed_at":"2026-07-04T15:20:15.091892Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T15:20:15.091892Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"m8JSG439LNIclcfwefSlcmp9AbZFhnCpCKPRqDN9XnxgNXEf6fMICBcYyZDwzeyUiJAt3gmTs0i/MZCAiCVlCg==","signature_status":"signed_v1","signed_at":"2026-07-04T15:20:15.092284Z","signed_message":"canonical_sha256_bytes"},"source_id":"astro-ph/0501168","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:cf317b9a23725228035f2a2deee40254b70a8caacf8b6cf0b6aea3e54beb8d56","sha256:15314163ab41dccda8a5c5bd4c3155b49ccc07ece47aa51c3c7f17608bff43bb"],"state_sha256":"45cca1324e86061c3be26f8ae6f06e1ae57db65326f7aadbafdcc1f554005714"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"lSQ7fs2rGxxSgs6V+Ds91zyImeBx+sU5M8HtZ1YNNWhc5wJQQuCoJcyEUmrPYz1mkqnPJhVU+ctQ5Z2bC0iHBA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-05T08:01:12.010110Z","bundle_sha256":"9ecbb98adde05aa700addeefde5b921f8a3f14ef36a32e95d7b8b1de38cef887"}}