{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2013:YA7MIPLUQ5VYSRCNSJBHJLNJL7","short_pith_number":"pith:YA7MIPLU","canonical_record":{"source":{"id":"1305.1337","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2013-05-06T21:45:23Z","cross_cats_sorted":["gr-qc","hep-th","physics.atom-ph"],"title_canon_sha256":"b0192bf04ae48f0c7bc232fe0fa5e38670c246ec074375007c82b85ea8792bcc","abstract_canon_sha256":"0b53ecbfa109474376fd7e680114e99b7b3032f91999e55d7559506796a10e78"},"schema_version":"1.0"},"canonical_sha256":"c03ec43d74876b89444d924274ada95fc81e65578b022d653dab12ba4dbeec20","source":{"kind":"arxiv","id":"1305.1337","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1305.1337","created_at":"2026-05-18T03:19:01Z"},{"alias_kind":"arxiv_version","alias_value":"1305.1337v2","created_at":"2026-05-18T03:19:01Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1305.1337","created_at":"2026-05-18T03:19:01Z"},{"alias_kind":"pith_short_12","alias_value":"YA7MIPLUQ5VY","created_at":"2026-05-18T12:28:06Z"},{"alias_kind":"pith_short_16","alias_value":"YA7MIPLUQ5VYSRCN","created_at":"2026-05-18T12:28:06Z"},{"alias_kind":"pith_short_8","alias_value":"YA7MIPLU","created_at":"2026-05-18T12:28:06Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2013:YA7MIPLUQ5VYSRCNSJBHJLNJL7","target":"record","payload":{"canonical_record":{"source":{"id":"1305.1337","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2013-05-06T21:45:23Z","cross_cats_sorted":["gr-qc","hep-th","physics.atom-ph"],"title_canon_sha256":"b0192bf04ae48f0c7bc232fe0fa5e38670c246ec074375007c82b85ea8792bcc","abstract_canon_sha256":"0b53ecbfa109474376fd7e680114e99b7b3032f91999e55d7559506796a10e78"},"schema_version":"1.0"},"canonical_sha256":"c03ec43d74876b89444d924274ada95fc81e65578b022d653dab12ba4dbeec20","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T03:19:01.050343Z","signature_b64":"MlNRQpCGGS+c0r478qGyqVL9v4q5WX6B/a3EErJEosDP3H66A1QQGIh/fWACH7TQMvx5DQBFPSqeKw3svlFnDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"c03ec43d74876b89444d924274ada95fc81e65578b022d653dab12ba4dbeec20","last_reissued_at":"2026-05-18T03:19:01.049515Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T03:19:01.049515Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1305.1337","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":"2026-05-18T03:19:01Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"btOiEYrJ9h2szfAVNm+VGUfS8x2KcmMuJPdDdwa/coa5sOQFSx+FRnsAQLxpv/zQGNNGjfGaoJ/NDJ/ZTkXwCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T20:59:26.858286Z"},"content_sha256":"e0e96da3eb547c53bc44f4a8a7f8a9f1dea92b330ad1c3362396cf829253b90a","schema_version":"1.0","event_id":"sha256:e0e96da3eb547c53bc44f4a8a7f8a9f1dea92b330ad1c3362396cf829253b90a"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2013:YA7MIPLUQ5VYSRCNSJBHJLNJL7","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Limits on the dependence of the fine-structure constant on gravitational potential from white-dwarf spectra","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["gr-qc","hep-th","physics.atom-ph"],"primary_cat":"astro-ph.CO","authors_text":"A. Ong, J. B. Holberg, J. C. Berengut, J. K. Webb, John D. Barrow, M. A. Barstow, S. P. Preval, V. V. Flambaum","submitted_at":"2013-05-06T21:45:23Z","abstract_excerpt":"We propose a new probe of the dependence of the fine structure constant, alpha, on a strong gravitational field using metal lines in the spectra of white dwarf stars. Comparison of laboratory spectra with far-UV astronomical spectra from the white dwarf star G191-B2B recorded by the Hubble Space Telescope Imaging Spectrograph gives limits on the fractional variation of alpha of (Delta alpha/alpha)=(4.2 +- 1.6)x10^(-5) and (-6.1 +- 5.8)x10^(-5) from Fe V and Ni V spectra, respectively, at a dimensionless gravitational potential relative to Earth of (Delta phi) ~ 5x10^(-5). With better determina"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1305.1337","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":""},"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":"2026-05-18T03:19:01Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Fd5rGjos8uhezH7y8o9zoY32AKMDUGb83ZXzhDiZwR7q3obIHlP2zll5b/BeptBHatfzfVlCrtmG+j77NpJ1Dg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T20:59:26.858873Z"},"content_sha256":"d2b236b66f36ea7291236f3c886ea975a0dc5f364d1c0567e7c6da39a9048374","schema_version":"1.0","event_id":"sha256:d2b236b66f36ea7291236f3c886ea975a0dc5f364d1c0567e7c6da39a9048374"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/YA7MIPLUQ5VYSRCNSJBHJLNJL7/bundle.json","state_url":"https://pith.science/pith/YA7MIPLUQ5VYSRCNSJBHJLNJL7/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/YA7MIPLUQ5VYSRCNSJBHJLNJL7/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":"2026-05-25T20:59:26Z","links":{"resolver":"https://pith.science/pith/YA7MIPLUQ5VYSRCNSJBHJLNJL7","bundle":"https://pith.science/pith/YA7MIPLUQ5VYSRCNSJBHJLNJL7/bundle.json","state":"https://pith.science/pith/YA7MIPLUQ5VYSRCNSJBHJLNJL7/state.json","well_known_bundle":"https://pith.science/.well-known/pith/YA7MIPLUQ5VYSRCNSJBHJLNJL7/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:YA7MIPLUQ5VYSRCNSJBHJLNJL7","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":"0b53ecbfa109474376fd7e680114e99b7b3032f91999e55d7559506796a10e78","cross_cats_sorted":["gr-qc","hep-th","physics.atom-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2013-05-06T21:45:23Z","title_canon_sha256":"b0192bf04ae48f0c7bc232fe0fa5e38670c246ec074375007c82b85ea8792bcc"},"schema_version":"1.0","source":{"id":"1305.1337","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1305.1337","created_at":"2026-05-18T03:19:01Z"},{"alias_kind":"arxiv_version","alias_value":"1305.1337v2","created_at":"2026-05-18T03:19:01Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1305.1337","created_at":"2026-05-18T03:19:01Z"},{"alias_kind":"pith_short_12","alias_value":"YA7MIPLUQ5VY","created_at":"2026-05-18T12:28:06Z"},{"alias_kind":"pith_short_16","alias_value":"YA7MIPLUQ5VYSRCN","created_at":"2026-05-18T12:28:06Z"},{"alias_kind":"pith_short_8","alias_value":"YA7MIPLU","created_at":"2026-05-18T12:28:06Z"}],"graph_snapshots":[{"event_id":"sha256:d2b236b66f36ea7291236f3c886ea975a0dc5f364d1c0567e7c6da39a9048374","target":"graph","created_at":"2026-05-18T03:19:01Z","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":"We propose a new probe of the dependence of the fine structure constant, alpha, on a strong gravitational field using metal lines in the spectra of white dwarf stars. Comparison of laboratory spectra with far-UV astronomical spectra from the white dwarf star G191-B2B recorded by the Hubble Space Telescope Imaging Spectrograph gives limits on the fractional variation of alpha of (Delta alpha/alpha)=(4.2 +- 1.6)x10^(-5) and (-6.1 +- 5.8)x10^(-5) from Fe V and Ni V spectra, respectively, at a dimensionless gravitational potential relative to Earth of (Delta phi) ~ 5x10^(-5). With better determina","authors_text":"A. Ong, J. B. Holberg, J. C. Berengut, J. K. Webb, John D. Barrow, M. A. Barstow, S. P. Preval, V. V. Flambaum","cross_cats":["gr-qc","hep-th","physics.atom-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2013-05-06T21:45:23Z","title":"Limits on the dependence of the fine-structure constant on gravitational potential from white-dwarf spectra"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1305.1337","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:e0e96da3eb547c53bc44f4a8a7f8a9f1dea92b330ad1c3362396cf829253b90a","target":"record","created_at":"2026-05-18T03:19:01Z","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":"0b53ecbfa109474376fd7e680114e99b7b3032f91999e55d7559506796a10e78","cross_cats_sorted":["gr-qc","hep-th","physics.atom-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2013-05-06T21:45:23Z","title_canon_sha256":"b0192bf04ae48f0c7bc232fe0fa5e38670c246ec074375007c82b85ea8792bcc"},"schema_version":"1.0","source":{"id":"1305.1337","kind":"arxiv","version":2}},"canonical_sha256":"c03ec43d74876b89444d924274ada95fc81e65578b022d653dab12ba4dbeec20","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"c03ec43d74876b89444d924274ada95fc81e65578b022d653dab12ba4dbeec20","first_computed_at":"2026-05-18T03:19:01.049515Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:19:01.049515Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"MlNRQpCGGS+c0r478qGyqVL9v4q5WX6B/a3EErJEosDP3H66A1QQGIh/fWACH7TQMvx5DQBFPSqeKw3svlFnDw==","signature_status":"signed_v1","signed_at":"2026-05-18T03:19:01.050343Z","signed_message":"canonical_sha256_bytes"},"source_id":"1305.1337","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:e0e96da3eb547c53bc44f4a8a7f8a9f1dea92b330ad1c3362396cf829253b90a","sha256:d2b236b66f36ea7291236f3c886ea975a0dc5f364d1c0567e7c6da39a9048374"],"state_sha256":"e3fe45505894453b1aa032a20dad18b2b418b406191cd933377af0b5b804a400"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"JZ7WQFJKLy/WGL1rkRNu1NTuwJYAE8jF3vr+7TXUHQHR3qXOhpo0RLMbuK0h0bwXvjY7Q9uXjnsmN9peG7S2AQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-25T20:59:26.862437Z","bundle_sha256":"383a433ed779bf317f0ec90555714cd643af282ed4edb9fea46d174358f105c9"}}