{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:22NFDEQEHAD4OLW6X6KTQU6RTQ","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":"4613f1d7e924910910e2e2a2ab9190c324e11897ca8014662fcc773fabdf4700","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.atom-ph","submitted_at":"2015-10-31T16:08:22Z","title_canon_sha256":"9ebce00f64f576284d5106ca7783f3499a45cb6ec900ba7ab7043865003b7861"},"schema_version":"1.0","source":{"id":"1511.00985","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1511.00985","created_at":"2026-05-18T00:37:36Z"},{"alias_kind":"arxiv_version","alias_value":"1511.00985v1","created_at":"2026-05-18T00:37:36Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1511.00985","created_at":"2026-05-18T00:37:36Z"},{"alias_kind":"pith_short_12","alias_value":"22NFDEQEHAD4","created_at":"2026-05-18T12:28:59Z"},{"alias_kind":"pith_short_16","alias_value":"22NFDEQEHAD4OLW6","created_at":"2026-05-18T12:28:59Z"},{"alias_kind":"pith_short_8","alias_value":"22NFDEQE","created_at":"2026-05-18T12:28:59Z"}],"graph_snapshots":[{"event_id":"sha256:2a60f5fa426ed9f8bfe65161210e60165b2b9e8f8a3113fc2d4bef475babf764","target":"graph","created_at":"2026-05-18T00:37:36Z","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":"Spectroscopy of hydrogen can be used for a search into physics beyond the Standard Model. Differences between the absorption spectra of H$_2$ as observed at high redshift and those measured in the laboratory can be interpreted in terms of possible variations of the proton-electron mass ratio. Investigation of some ten of such absorbers in the redshift range $z= 2.0-4.2$ yields a constraint of $|\\Delta\\mu/\\mu|< 5 \\times 10^{-6}$ at 3$\\sigma$. Observation of H$_2$ from the photospheres of white dwarf stars inside our Galaxy delivers a constraint of similar magnitude on a dependence of $\\mu$ on a","authors_text":"Edcel J. Salumbides, Jeroen C.J. Koelemeij, Kjeld S.E. Eikema, Wim Ubachs","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.atom-ph","submitted_at":"2015-10-31T16:08:22Z","title":"Physics beyond the Standard Model from hydrogen spectroscopy"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1511.00985","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":"sha256:526626adb3ed865bb9c299749f1b3c04d2fa3c57a43686435b7ee5d7266a6e4f","target":"record","created_at":"2026-05-18T00:37:36Z","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":"4613f1d7e924910910e2e2a2ab9190c324e11897ca8014662fcc773fabdf4700","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.atom-ph","submitted_at":"2015-10-31T16:08:22Z","title_canon_sha256":"9ebce00f64f576284d5106ca7783f3499a45cb6ec900ba7ab7043865003b7861"},"schema_version":"1.0","source":{"id":"1511.00985","kind":"arxiv","version":1}},"canonical_sha256":"d69a5192043807c72edebf953853d19c13714eb5eafe1d1852f70eb7dafbcfbc","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"d69a5192043807c72edebf953853d19c13714eb5eafe1d1852f70eb7dafbcfbc","first_computed_at":"2026-05-18T00:37:36.898658Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:37:36.898658Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"u52zNcPadzsj0DtwWpWHzUYnIeGnt5/wk9ilZeN66ohgoxR9lw3iEky3/eYE7J8giXWGXvFVSVYDFXbUJY1bAQ==","signature_status":"signed_v1","signed_at":"2026-05-18T00:37:36.899391Z","signed_message":"canonical_sha256_bytes"},"source_id":"1511.00985","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:526626adb3ed865bb9c299749f1b3c04d2fa3c57a43686435b7ee5d7266a6e4f","sha256:2a60f5fa426ed9f8bfe65161210e60165b2b9e8f8a3113fc2d4bef475babf764"],"state_sha256":"f3a588a1c977f2b784d2decbb076a1d8a741cd6a7ff744a6ebdda63dba59ad74"}