{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:UQJTMFY4KXO7XKCJB6SBCL7JIC","short_pith_number":"pith:UQJTMFY4","canonical_record":{"source":{"id":"1603.04498","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2016-03-14T22:59:53Z","cross_cats_sorted":["gr-qc","hep-ph","hep-th"],"title_canon_sha256":"88e3579ca64911f774b73ad27ed188a92cb852192e88a6756db350cfdc031434","abstract_canon_sha256":"e202bd5a80bb412a2b853932fdce06a148accf8af23412ac6feadcd1ab180ac1"},"schema_version":"1.0"},"canonical_sha256":"a41336171c55ddfba8490fa4112fe940a566300310c480103d63343c61a0cd45","source":{"kind":"arxiv","id":"1603.04498","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1603.04498","created_at":"2026-05-18T01:19:04Z"},{"alias_kind":"arxiv_version","alias_value":"1603.04498v1","created_at":"2026-05-18T01:19:04Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1603.04498","created_at":"2026-05-18T01:19:04Z"},{"alias_kind":"pith_short_12","alias_value":"UQJTMFY4KXO7","created_at":"2026-05-18T12:30:46Z"},{"alias_kind":"pith_short_16","alias_value":"UQJTMFY4KXO7XKCJ","created_at":"2026-05-18T12:30:46Z"},{"alias_kind":"pith_short_8","alias_value":"UQJTMFY4","created_at":"2026-05-18T12:30:46Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:UQJTMFY4KXO7XKCJB6SBCL7JIC","target":"record","payload":{"canonical_record":{"source":{"id":"1603.04498","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2016-03-14T22:59:53Z","cross_cats_sorted":["gr-qc","hep-ph","hep-th"],"title_canon_sha256":"88e3579ca64911f774b73ad27ed188a92cb852192e88a6756db350cfdc031434","abstract_canon_sha256":"e202bd5a80bb412a2b853932fdce06a148accf8af23412ac6feadcd1ab180ac1"},"schema_version":"1.0"},"canonical_sha256":"a41336171c55ddfba8490fa4112fe940a566300310c480103d63343c61a0cd45","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:19:04.791420Z","signature_b64":"VHsYh0Di1/J/MrezV2NudDKTDhlqDYWyo/ULF0tzClx03NV06+WeuC2b67YWZe7B92cTHJUDg2Lm8e7s2G1+Aw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"a41336171c55ddfba8490fa4112fe940a566300310c480103d63343c61a0cd45","last_reissued_at":"2026-05-18T01:19:04.790794Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:19:04.790794Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1603.04498","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:19:04Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"9YHXCzyX9vx9dKFpSy5PGjCh6b5pVxVJ82I5P3/3VgYdqefITlMuDI9PefRbTd/YFsFgaorNc+WmX+txtl5DDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T08:23:31.752847Z"},"content_sha256":"4437007474a16736014d55cb00c5d79760f23035f6d035765821b19e46f01ac8","schema_version":"1.0","event_id":"sha256:4437007474a16736014d55cb00c5d79760f23035f6d035765821b19e46f01ac8"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:UQJTMFY4KXO7XKCJB6SBCL7JIC","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Updated constraints on spatial variations of the fine-structure constant","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["gr-qc","hep-ph","hep-th"],"primary_cat":"astro-ph.CO","authors_text":"A. M. M. Pinho, C. J. A. P. Martins","submitted_at":"2016-03-14T22:59:53Z","abstract_excerpt":"Recent work by Webb {\\it et al.} has provided indications of spatial variations of the fine-structure constant, $\\alpha$, at a level of a few parts per million. Using a dataset of 293 archival measurements, they further show that a dipole provides a statistically good fit to the data, a result subsequently confirmed by other authors. Here we show that a more recent dataset of dedicated measurements further constrains these variations: although there are only 10 such measurements, their uncertainties are considerably smaller. We find that a dipolar variation is still a good fit to the combined "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1603.04498","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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:19:04Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"M0UVZsN/I3PBIxOO0JnVJtEGyHgyIQH7HV2ssNLIT/OYc0scgS4FWU1fCrqvRJ+Ugkxv2K3e4jdjIqtUiGKfDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T08:23:31.753185Z"},"content_sha256":"c3c865c234a443485da7abcf1a1f8ef75b40fe2f972dc0b116c76827e4440966","schema_version":"1.0","event_id":"sha256:c3c865c234a443485da7abcf1a1f8ef75b40fe2f972dc0b116c76827e4440966"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/UQJTMFY4KXO7XKCJB6SBCL7JIC/bundle.json","state_url":"https://pith.science/pith/UQJTMFY4KXO7XKCJB6SBCL7JIC/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/UQJTMFY4KXO7XKCJB6SBCL7JIC/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":"2026-06-01T08:23:31Z","links":{"resolver":"https://pith.science/pith/UQJTMFY4KXO7XKCJB6SBCL7JIC","bundle":"https://pith.science/pith/UQJTMFY4KXO7XKCJB6SBCL7JIC/bundle.json","state":"https://pith.science/pith/UQJTMFY4KXO7XKCJB6SBCL7JIC/state.json","well_known_bundle":"https://pith.science/.well-known/pith/UQJTMFY4KXO7XKCJB6SBCL7JIC/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:UQJTMFY4KXO7XKCJB6SBCL7JIC","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":"e202bd5a80bb412a2b853932fdce06a148accf8af23412ac6feadcd1ab180ac1","cross_cats_sorted":["gr-qc","hep-ph","hep-th"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2016-03-14T22:59:53Z","title_canon_sha256":"88e3579ca64911f774b73ad27ed188a92cb852192e88a6756db350cfdc031434"},"schema_version":"1.0","source":{"id":"1603.04498","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1603.04498","created_at":"2026-05-18T01:19:04Z"},{"alias_kind":"arxiv_version","alias_value":"1603.04498v1","created_at":"2026-05-18T01:19:04Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1603.04498","created_at":"2026-05-18T01:19:04Z"},{"alias_kind":"pith_short_12","alias_value":"UQJTMFY4KXO7","created_at":"2026-05-18T12:30:46Z"},{"alias_kind":"pith_short_16","alias_value":"UQJTMFY4KXO7XKCJ","created_at":"2026-05-18T12:30:46Z"},{"alias_kind":"pith_short_8","alias_value":"UQJTMFY4","created_at":"2026-05-18T12:30:46Z"}],"graph_snapshots":[{"event_id":"sha256:c3c865c234a443485da7abcf1a1f8ef75b40fe2f972dc0b116c76827e4440966","target":"graph","created_at":"2026-05-18T01:19:04Z","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":"Recent work by Webb {\\it et al.} has provided indications of spatial variations of the fine-structure constant, $\\alpha$, at a level of a few parts per million. Using a dataset of 293 archival measurements, they further show that a dipole provides a statistically good fit to the data, a result subsequently confirmed by other authors. Here we show that a more recent dataset of dedicated measurements further constrains these variations: although there are only 10 such measurements, their uncertainties are considerably smaller. We find that a dipolar variation is still a good fit to the combined ","authors_text":"A. M. M. Pinho, C. J. A. P. Martins","cross_cats":["gr-qc","hep-ph","hep-th"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2016-03-14T22:59:53Z","title":"Updated constraints on spatial variations of the fine-structure constant"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1603.04498","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":"sha256:4437007474a16736014d55cb00c5d79760f23035f6d035765821b19e46f01ac8","target":"record","created_at":"2026-05-18T01:19:04Z","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":"e202bd5a80bb412a2b853932fdce06a148accf8af23412ac6feadcd1ab180ac1","cross_cats_sorted":["gr-qc","hep-ph","hep-th"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2016-03-14T22:59:53Z","title_canon_sha256":"88e3579ca64911f774b73ad27ed188a92cb852192e88a6756db350cfdc031434"},"schema_version":"1.0","source":{"id":"1603.04498","kind":"arxiv","version":1}},"canonical_sha256":"a41336171c55ddfba8490fa4112fe940a566300310c480103d63343c61a0cd45","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"a41336171c55ddfba8490fa4112fe940a566300310c480103d63343c61a0cd45","first_computed_at":"2026-05-18T01:19:04.790794Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:19:04.790794Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"VHsYh0Di1/J/MrezV2NudDKTDhlqDYWyo/ULF0tzClx03NV06+WeuC2b67YWZe7B92cTHJUDg2Lm8e7s2G1+Aw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:19:04.791420Z","signed_message":"canonical_sha256_bytes"},"source_id":"1603.04498","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:4437007474a16736014d55cb00c5d79760f23035f6d035765821b19e46f01ac8","sha256:c3c865c234a443485da7abcf1a1f8ef75b40fe2f972dc0b116c76827e4440966"],"state_sha256":"3acaf8486ae727a94fa69d6ff1ad9e21a3e6dd27029721e6d54697c41cb07468"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"3VGl3J8sPgr4pWXU4OGe97LEj67/qMNRBUJXIpjr6z3o4FQfujM9URuXU8Ow5zSmvZgFu9Pcz6nP/JTgLZQCDA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-01T08:23:31.755145Z","bundle_sha256":"55c43b780ac9ceb003825410ed3704371a75b4c02761a848f6c77e1d96af3e45"}}