{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:QWJGMYU64KCR4JOBXLQUZZCAZG","short_pith_number":"pith:QWJGMYU6","canonical_record":{"source":{"id":"1906.03682","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2019-06-09T18:07:59Z","cross_cats_sorted":["astro-ph.GA","gr-qc","physics.space-ph"],"title_canon_sha256":"681f1c9e3f4970c898968d27416fa57ee063732eedd46e9664b8d8e38c60a3e7","abstract_canon_sha256":"b1ae5d2b695aecc2bb892bc1eb669129e7dc2b02886c174f0c8b70e15032e1ed"},"schema_version":"1.0"},"canonical_sha256":"859266629ee2851e25c1bae14ce440c9b6017426ef87c1ce8d812e4762ce4132","source":{"kind":"arxiv","id":"1906.03682","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1906.03682","created_at":"2026-05-17T23:42:59Z"},{"alias_kind":"arxiv_version","alias_value":"1906.03682v1","created_at":"2026-05-17T23:42:59Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1906.03682","created_at":"2026-05-17T23:42:59Z"},{"alias_kind":"pith_short_12","alias_value":"QWJGMYU64KCR","created_at":"2026-05-18T12:33:27Z"},{"alias_kind":"pith_short_16","alias_value":"QWJGMYU64KCR4JOB","created_at":"2026-05-18T12:33:27Z"},{"alias_kind":"pith_short_8","alias_value":"QWJGMYU6","created_at":"2026-05-18T12:33:27Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:QWJGMYU64KCR4JOBXLQUZZCAZG","target":"record","payload":{"canonical_record":{"source":{"id":"1906.03682","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2019-06-09T18:07:59Z","cross_cats_sorted":["astro-ph.GA","gr-qc","physics.space-ph"],"title_canon_sha256":"681f1c9e3f4970c898968d27416fa57ee063732eedd46e9664b8d8e38c60a3e7","abstract_canon_sha256":"b1ae5d2b695aecc2bb892bc1eb669129e7dc2b02886c174f0c8b70e15032e1ed"},"schema_version":"1.0"},"canonical_sha256":"859266629ee2851e25c1bae14ce440c9b6017426ef87c1ce8d812e4762ce4132","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:42:59.855151Z","signature_b64":"lXQiS4pdtJdHEiAN6pnb2qT3nQze8xfPIK2w6zPsVt/lWjTqgvc2p/dv6HuhYa4S17DYxQGtfrn4+GwYcjNyAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"859266629ee2851e25c1bae14ce440c9b6017426ef87c1ce8d812e4762ce4132","last_reissued_at":"2026-05-17T23:42:59.854624Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:42:59.854624Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1906.03682","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":"2026-05-17T23:42:59Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"dLjFjSwG1/pR35wsdzGFD8kdhcLbu0+NTlRM1SmtnZwJyE1Ta7idSDEzLxYjeZtzdEtvFI+n4dk2Xc41VFiwBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-04T20:39:45.828427Z"},"content_sha256":"1446b0d8e2b7097042b11bdca2ec2924140bbc6c5ee0b201f70856baf5012e86","schema_version":"1.0","event_id":"sha256:1446b0d8e2b7097042b11bdca2ec2924140bbc6c5ee0b201f70856baf5012e86"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:QWJGMYU64KCR4JOBXLQUZZCAZG","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Testing the weak equivalence principle by differential measurements of fundamental constants in the Magellanic Clouds","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.GA","gr-qc","physics.space-ph"],"primary_cat":"astro-ph.CO","authors_text":"B. Mookerjea, C. Henkel, I.I. Agafonova, K.-W. Ng, S.A. Levshakov, S.-Y. Liu, W.-H. Wang","submitted_at":"2019-06-09T18:07:59Z","abstract_excerpt":"Non-standard fields are assumed to be responsible for phenomena attributed to dark energy and dark matter. Being coupled to ordinary matter, these fields modify the masses and/or charges of the elementary particles, thereby violating the Weak Equivalence Principle. Thus, values of fundamental constants such as the proton-to-electron mass ratio, mu, and/or the fine structure constant, alpha, measured in different environment conditions can be used as probes for this coupling. Here we perform differential measurements of F = mu*alpha^2 to test a non-standard coupling in the Magellanic Clouds - d"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1906.03682","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":"2026-05-17T23:42:59Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"JNx2vT83UPmoWXsV7vSUIxzvHXAsIqqRMa92cjltCjLFtIJ7WExisCSq392yIIMdakSwUZTbRVYfVW01fTEuCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-04T20:39:45.828779Z"},"content_sha256":"3afa3f98659aac4dba09fbed53158599e23dc3d7ccdddd39d04ca71acc983bfe","schema_version":"1.0","event_id":"sha256:3afa3f98659aac4dba09fbed53158599e23dc3d7ccdddd39d04ca71acc983bfe"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/QWJGMYU64KCR4JOBXLQUZZCAZG/bundle.json","state_url":"https://pith.science/pith/QWJGMYU64KCR4JOBXLQUZZCAZG/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/QWJGMYU64KCR4JOBXLQUZZCAZG/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":"2026-07-04T20:39:45Z","links":{"resolver":"https://pith.science/pith/QWJGMYU64KCR4JOBXLQUZZCAZG","bundle":"https://pith.science/pith/QWJGMYU64KCR4JOBXLQUZZCAZG/bundle.json","state":"https://pith.science/pith/QWJGMYU64KCR4JOBXLQUZZCAZG/state.json","well_known_bundle":"https://pith.science/.well-known/pith/QWJGMYU64KCR4JOBXLQUZZCAZG/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:QWJGMYU64KCR4JOBXLQUZZCAZG","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":"b1ae5d2b695aecc2bb892bc1eb669129e7dc2b02886c174f0c8b70e15032e1ed","cross_cats_sorted":["astro-ph.GA","gr-qc","physics.space-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2019-06-09T18:07:59Z","title_canon_sha256":"681f1c9e3f4970c898968d27416fa57ee063732eedd46e9664b8d8e38c60a3e7"},"schema_version":"1.0","source":{"id":"1906.03682","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1906.03682","created_at":"2026-05-17T23:42:59Z"},{"alias_kind":"arxiv_version","alias_value":"1906.03682v1","created_at":"2026-05-17T23:42:59Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1906.03682","created_at":"2026-05-17T23:42:59Z"},{"alias_kind":"pith_short_12","alias_value":"QWJGMYU64KCR","created_at":"2026-05-18T12:33:27Z"},{"alias_kind":"pith_short_16","alias_value":"QWJGMYU64KCR4JOB","created_at":"2026-05-18T12:33:27Z"},{"alias_kind":"pith_short_8","alias_value":"QWJGMYU6","created_at":"2026-05-18T12:33:27Z"}],"graph_snapshots":[{"event_id":"sha256:3afa3f98659aac4dba09fbed53158599e23dc3d7ccdddd39d04ca71acc983bfe","target":"graph","created_at":"2026-05-17T23:42:59Z","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":"Non-standard fields are assumed to be responsible for phenomena attributed to dark energy and dark matter. Being coupled to ordinary matter, these fields modify the masses and/or charges of the elementary particles, thereby violating the Weak Equivalence Principle. Thus, values of fundamental constants such as the proton-to-electron mass ratio, mu, and/or the fine structure constant, alpha, measured in different environment conditions can be used as probes for this coupling. Here we perform differential measurements of F = mu*alpha^2 to test a non-standard coupling in the Magellanic Clouds - d","authors_text":"B. Mookerjea, C. Henkel, I.I. Agafonova, K.-W. Ng, S.A. Levshakov, S.-Y. Liu, W.-H. Wang","cross_cats":["astro-ph.GA","gr-qc","physics.space-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2019-06-09T18:07:59Z","title":"Testing the weak equivalence principle by differential measurements of fundamental constants in the Magellanic Clouds"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1906.03682","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":"sha256:1446b0d8e2b7097042b11bdca2ec2924140bbc6c5ee0b201f70856baf5012e86","target":"record","created_at":"2026-05-17T23:42:59Z","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":"b1ae5d2b695aecc2bb892bc1eb669129e7dc2b02886c174f0c8b70e15032e1ed","cross_cats_sorted":["astro-ph.GA","gr-qc","physics.space-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2019-06-09T18:07:59Z","title_canon_sha256":"681f1c9e3f4970c898968d27416fa57ee063732eedd46e9664b8d8e38c60a3e7"},"schema_version":"1.0","source":{"id":"1906.03682","kind":"arxiv","version":1}},"canonical_sha256":"859266629ee2851e25c1bae14ce440c9b6017426ef87c1ce8d812e4762ce4132","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"859266629ee2851e25c1bae14ce440c9b6017426ef87c1ce8d812e4762ce4132","first_computed_at":"2026-05-17T23:42:59.854624Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:42:59.854624Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"lXQiS4pdtJdHEiAN6pnb2qT3nQze8xfPIK2w6zPsVt/lWjTqgvc2p/dv6HuhYa4S17DYxQGtfrn4+GwYcjNyAw==","signature_status":"signed_v1","signed_at":"2026-05-17T23:42:59.855151Z","signed_message":"canonical_sha256_bytes"},"source_id":"1906.03682","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:1446b0d8e2b7097042b11bdca2ec2924140bbc6c5ee0b201f70856baf5012e86","sha256:3afa3f98659aac4dba09fbed53158599e23dc3d7ccdddd39d04ca71acc983bfe"],"state_sha256":"36ad74d6d6873604f65ae61c2bf9e5d18cf7a39cb51d959fd97ddb15247762b0"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"UwOhaNVMFRbciUu6io6QbHb+OQLKqFYIc9+igcMU+Lmnq22Yf+OgDs8hOX9U6R5IxAR+q99WvxADHlMJycwaCg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-04T20:39:45.830662Z","bundle_sha256":"6a58e3cd19dfbdc4700e16b42025f480e58779d43047254b1938e2b6926b2886"}}