{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:UZ2GJI5RRBG4NFDLGVZI6RXSVT","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":"bd383b863d406d044e4ca76a82b15faa00c7269db8b43fb1351e41b3fdeb05c7","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2015-01-22T15:25:11Z","title_canon_sha256":"68b53fd39779e27e8f82a0d43b21c5a22d950769719c721b88f70c942cf0d6e6"},"schema_version":"1.0","source":{"id":"1501.05533","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1501.05533","created_at":"2026-05-18T01:41:09Z"},{"alias_kind":"arxiv_version","alias_value":"1501.05533v1","created_at":"2026-05-18T01:41:09Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1501.05533","created_at":"2026-05-18T01:41:09Z"},{"alias_kind":"pith_short_12","alias_value":"UZ2GJI5RRBG4","created_at":"2026-05-18T12:29:44Z"},{"alias_kind":"pith_short_16","alias_value":"UZ2GJI5RRBG4NFDL","created_at":"2026-05-18T12:29:44Z"},{"alias_kind":"pith_short_8","alias_value":"UZ2GJI5R","created_at":"2026-05-18T12:29:44Z"}],"graph_snapshots":[{"event_id":"sha256:df98fb86f6ef53793e687383d5ee907ed51fc07b91ec03c8ece7729942d94c9c","target":"graph","created_at":"2026-05-18T01:41:09Z","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"},"paper":{"abstract_excerpt":"A molecular hydrogen absorber at a lookback time of 12.4 billion years, corresponding to 10$\\%$ of the age of the universe today, is analyzed to put a constraint on a varying proton--electron mass ratio, $\\mu$. A high resolution spectrum of the J1443$+$2724 quasar, which was observed with the Very Large Telescope, is used to create an accurate model of 89 Lyman and Werner band transitions whose relative frequencies are sensitive to $\\mu$, yielding a limit on the relative deviation from the current laboratory value of $\\Delta\\mu/\\mu=(-9.5\\pm5.4_{\\textrm{stat}} \\pm 5.3_{\\textrm{sys}})\\times 10^{","authors_text":"Australia), J. Bagdonaite (1), J. B. Whitmore (2) ((1) VU University Amsterdam, M. T. Murphy (2), Netherlands (2) Swinburne University of Technology, W. Ubachs (1)","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2015-01-22T15:25:11Z","title":"A constraint on a varying proton--electron mass ratio 1.5 billion years after the Big Bang"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1501.05533","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":"sha256:7514cdc3741567f9cbf2b7994da819bf539e4f649ccdbd0948d5c60d91333c39","target":"record","created_at":"2026-05-18T01:41:09Z","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":"bd383b863d406d044e4ca76a82b15faa00c7269db8b43fb1351e41b3fdeb05c7","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2015-01-22T15:25:11Z","title_canon_sha256":"68b53fd39779e27e8f82a0d43b21c5a22d950769719c721b88f70c942cf0d6e6"},"schema_version":"1.0","source":{"id":"1501.05533","kind":"arxiv","version":1}},"canonical_sha256":"a67464a3b1884dc6946b35728f46f2ace52765acfb8680863a6ffa770192c7b3","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"a67464a3b1884dc6946b35728f46f2ace52765acfb8680863a6ffa770192c7b3","first_computed_at":"2026-05-18T01:41:09.281016Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:41:09.281016Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Gk34XdXqRVH4RXAZuWMqU1vLPg+hlwp7Lsfi/CUY/jVN5P2IDdIupank85BwlvPYkAgfLV00X4Bm3EzHsiv3Ag==","signature_status":"signed_v1","signed_at":"2026-05-18T01:41:09.281949Z","signed_message":"canonical_sha256_bytes"},"source_id":"1501.05533","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:7514cdc3741567f9cbf2b7994da819bf539e4f649ccdbd0948d5c60d91333c39","sha256:df98fb86f6ef53793e687383d5ee907ed51fc07b91ec03c8ece7729942d94c9c"],"state_sha256":"cd53e7d2437d434374ca0a8c18f73db976bcc0ab27d68f86cb33b71241c7d0fd"}