{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2008:KK3EUVY2LGLMMC26OP5DIYEEJZ","short_pith_number":"pith:KK3EUVY2","canonical_record":{"source":{"id":"0807.1381","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.atom-ph","submitted_at":"2008-07-09T06:41:11Z","cross_cats_sorted":["physics.gen-ph"],"title_canon_sha256":"2253145a3a050de6ffcc6e53e4817bab1fc5d5bd2dda3eacaa46967303426ad1","abstract_canon_sha256":"5f8026157a8352b3c7bb0a470a6d52b64758e3b62a0a45d4979181462dbc9ddc"},"schema_version":"1.0"},"canonical_sha256":"52b64a571a5996c60b5e73fa3460844e6aff3cf507081b8f40bfe60d113235dd","source":{"kind":"arxiv","id":"0807.1381","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0807.1381","created_at":"2026-07-04T17:27:26Z"},{"alias_kind":"arxiv_version","alias_value":"0807.1381v1","created_at":"2026-07-04T17:27:26Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0807.1381","created_at":"2026-07-04T17:27:26Z"},{"alias_kind":"pith_short_12","alias_value":"KK3EUVY2LGLM","created_at":"2026-07-04T17:27:26Z"},{"alias_kind":"pith_short_16","alias_value":"KK3EUVY2LGLMMC26","created_at":"2026-07-04T17:27:26Z"},{"alias_kind":"pith_short_8","alias_value":"KK3EUVY2","created_at":"2026-07-04T17:27:26Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2008:KK3EUVY2LGLMMC26OP5DIYEEJZ","target":"record","payload":{"canonical_record":{"source":{"id":"0807.1381","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.atom-ph","submitted_at":"2008-07-09T06:41:11Z","cross_cats_sorted":["physics.gen-ph"],"title_canon_sha256":"2253145a3a050de6ffcc6e53e4817bab1fc5d5bd2dda3eacaa46967303426ad1","abstract_canon_sha256":"5f8026157a8352b3c7bb0a470a6d52b64758e3b62a0a45d4979181462dbc9ddc"},"schema_version":"1.0"},"canonical_sha256":"52b64a571a5996c60b5e73fa3460844e6aff3cf507081b8f40bfe60d113235dd","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T17:27:26.657094Z","signature_b64":"YBVCAarsRNItTvWqnFKQQksPSaJfBO3IQF+2mFxQc8vEvkuTbWILE1vQojNyYycVTQxd8CopUI5iQTd6kO2WDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"52b64a571a5996c60b5e73fa3460844e6aff3cf507081b8f40bfe60d113235dd","last_reissued_at":"2026-07-04T17:27:26.656615Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T17:27:26.656615Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0807.1381","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":"2026-07-04T17:27:26Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"vhzShERBmBRtxhkZ9Oyipo1l6XU9MbKVvZLPSAn7EXFf/dMByQetnewavWfXMDsJ4cMVOQRmHrjns36WeJNDDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-05T10:11:13.077220Z"},"content_sha256":"c12f5aef52993b69dc82da05286ff284a8202e4be5a2eb1a465fa6bccbfd84ec","schema_version":"1.0","event_id":"sha256:c12f5aef52993b69dc82da05286ff284a8202e4be5a2eb1a465fa6bccbfd84ec"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2008:KK3EUVY2LGLMMC26OP5DIYEEJZ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Accurate calculations of Sr properties for a high-accuracy optical clock","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["physics.gen-ph"],"primary_cat":"physics.atom-ph","authors_text":"Andrew D. Ludlow, Jun Ye, Martin M. Boyd, S. G. Porsev","submitted_at":"2008-07-09T06:41:11Z","abstract_excerpt":"We have carried out calculations towards the goal of reducing the inaccuracy of the Sr optical atomic clock to 1$\\times10^{-17}$ and below. We calculated a.c. polarizabilities of the $5s^2 ^1S_0$ and $5s5p ^3P_0^o$ clock states that are important for reducing the uncertainty of blackbody radiation-induced frequency shifts for the $^1S_0 - ^3P_0^o$ clock transition. We determined four low-lying even-parity states whose total contribution to the static polarizability of the $^3P_0^o$ clock state is at the level of 90%. We show that if the contribution of these states is experimentally known with"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0807.1381","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/0807.1381/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-07-04T17:27:26Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"UPnUM7G/YMp9OCNVT7qVxiYukz3xS0kwPK60ZhzoVP3mk5xDNnYXRuihZKCsl/e+MfYI0u7+HmEk4kM8GmskDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-05T10:11:13.077724Z"},"content_sha256":"b2122f87982fe71ac8753f47f419f9597c6c4db30214503a86feaa3835cb4dbf","schema_version":"1.0","event_id":"sha256:b2122f87982fe71ac8753f47f419f9597c6c4db30214503a86feaa3835cb4dbf"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/KK3EUVY2LGLMMC26OP5DIYEEJZ/bundle.json","state_url":"https://pith.science/pith/KK3EUVY2LGLMMC26OP5DIYEEJZ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/KK3EUVY2LGLMMC26OP5DIYEEJZ/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":"2026-08-05T10:11:13Z","links":{"resolver":"https://pith.science/pith/KK3EUVY2LGLMMC26OP5DIYEEJZ","bundle":"https://pith.science/pith/KK3EUVY2LGLMMC26OP5DIYEEJZ/bundle.json","state":"https://pith.science/pith/KK3EUVY2LGLMMC26OP5DIYEEJZ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/KK3EUVY2LGLMMC26OP5DIYEEJZ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2008:KK3EUVY2LGLMMC26OP5DIYEEJZ","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":"5f8026157a8352b3c7bb0a470a6d52b64758e3b62a0a45d4979181462dbc9ddc","cross_cats_sorted":["physics.gen-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.atom-ph","submitted_at":"2008-07-09T06:41:11Z","title_canon_sha256":"2253145a3a050de6ffcc6e53e4817bab1fc5d5bd2dda3eacaa46967303426ad1"},"schema_version":"1.0","source":{"id":"0807.1381","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0807.1381","created_at":"2026-07-04T17:27:26Z"},{"alias_kind":"arxiv_version","alias_value":"0807.1381v1","created_at":"2026-07-04T17:27:26Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0807.1381","created_at":"2026-07-04T17:27:26Z"},{"alias_kind":"pith_short_12","alias_value":"KK3EUVY2LGLM","created_at":"2026-07-04T17:27:26Z"},{"alias_kind":"pith_short_16","alias_value":"KK3EUVY2LGLMMC26","created_at":"2026-07-04T17:27:26Z"},{"alias_kind":"pith_short_8","alias_value":"KK3EUVY2","created_at":"2026-07-04T17:27:26Z"}],"graph_snapshots":[{"event_id":"sha256:b2122f87982fe71ac8753f47f419f9597c6c4db30214503a86feaa3835cb4dbf","target":"graph","created_at":"2026-07-04T17:27:26Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/0807.1381/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We have carried out calculations towards the goal of reducing the inaccuracy of the Sr optical atomic clock to 1$\\times10^{-17}$ and below. We calculated a.c. polarizabilities of the $5s^2 ^1S_0$ and $5s5p ^3P_0^o$ clock states that are important for reducing the uncertainty of blackbody radiation-induced frequency shifts for the $^1S_0 - ^3P_0^o$ clock transition. We determined four low-lying even-parity states whose total contribution to the static polarizability of the $^3P_0^o$ clock state is at the level of 90%. We show that if the contribution of these states is experimentally known with","authors_text":"Andrew D. Ludlow, Jun Ye, Martin M. Boyd, S. G. Porsev","cross_cats":["physics.gen-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.atom-ph","submitted_at":"2008-07-09T06:41:11Z","title":"Accurate calculations of Sr properties for a high-accuracy optical clock"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0807.1381","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:c12f5aef52993b69dc82da05286ff284a8202e4be5a2eb1a465fa6bccbfd84ec","target":"record","created_at":"2026-07-04T17:27:26Z","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":"5f8026157a8352b3c7bb0a470a6d52b64758e3b62a0a45d4979181462dbc9ddc","cross_cats_sorted":["physics.gen-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.atom-ph","submitted_at":"2008-07-09T06:41:11Z","title_canon_sha256":"2253145a3a050de6ffcc6e53e4817bab1fc5d5bd2dda3eacaa46967303426ad1"},"schema_version":"1.0","source":{"id":"0807.1381","kind":"arxiv","version":1}},"canonical_sha256":"52b64a571a5996c60b5e73fa3460844e6aff3cf507081b8f40bfe60d113235dd","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"52b64a571a5996c60b5e73fa3460844e6aff3cf507081b8f40bfe60d113235dd","first_computed_at":"2026-07-04T17:27:26.656615Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T17:27:26.656615Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"YBVCAarsRNItTvWqnFKQQksPSaJfBO3IQF+2mFxQc8vEvkuTbWILE1vQojNyYycVTQxd8CopUI5iQTd6kO2WDw==","signature_status":"signed_v1","signed_at":"2026-07-04T17:27:26.657094Z","signed_message":"canonical_sha256_bytes"},"source_id":"0807.1381","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:c12f5aef52993b69dc82da05286ff284a8202e4be5a2eb1a465fa6bccbfd84ec","sha256:b2122f87982fe71ac8753f47f419f9597c6c4db30214503a86feaa3835cb4dbf"],"state_sha256":"cb98fef06c6d29adc1a3faed849ff745c7089391c47b1d0070907dbdb06358d6"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"7eA7V6tOVT9fHcE0MYd8KaWxudAjQYo5Gz6J/K3YWS4VPVyied5YBphCPKjLl5HW5LNIy5HPGIZKtHRmv5SxCw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-05T10:11:13.081135Z","bundle_sha256":"350efe9f232932578272bb496052e2c9175c4bac8456d0dc237dff8c3d6dec06"}}