{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:HI5SJ6AACSAPVAW74KECVIEHYI","short_pith_number":"pith:HI5SJ6AA","canonical_record":{"source":{"id":"1608.02062","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2016-08-06T03:46:22Z","cross_cats_sorted":["astro-ph.GA"],"title_canon_sha256":"653097e26266be799310ab7ac3bc20578ae09a5a6ece0a28e19fb395a3a391c7","abstract_canon_sha256":"f07af51286475a7cc93be1f311b994942c52cfaadc3e8e743cf80b4cbe9bb250"},"schema_version":"1.0"},"canonical_sha256":"3a3b24f8001480fa82dfe2882aa087c21f3e588302236cf52abfcba7dbb6fd95","source":{"kind":"arxiv","id":"1608.02062","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1608.02062","created_at":"2026-05-18T01:09:41Z"},{"alias_kind":"arxiv_version","alias_value":"1608.02062v1","created_at":"2026-05-18T01:09:41Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1608.02062","created_at":"2026-05-18T01:09:41Z"},{"alias_kind":"pith_short_12","alias_value":"HI5SJ6AACSAP","created_at":"2026-05-18T12:30:19Z"},{"alias_kind":"pith_short_16","alias_value":"HI5SJ6AACSAPVAW7","created_at":"2026-05-18T12:30:19Z"},{"alias_kind":"pith_short_8","alias_value":"HI5SJ6AA","created_at":"2026-05-18T12:30:19Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:HI5SJ6AACSAPVAW74KECVIEHYI","target":"record","payload":{"canonical_record":{"source":{"id":"1608.02062","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2016-08-06T03:46:22Z","cross_cats_sorted":["astro-ph.GA"],"title_canon_sha256":"653097e26266be799310ab7ac3bc20578ae09a5a6ece0a28e19fb395a3a391c7","abstract_canon_sha256":"f07af51286475a7cc93be1f311b994942c52cfaadc3e8e743cf80b4cbe9bb250"},"schema_version":"1.0"},"canonical_sha256":"3a3b24f8001480fa82dfe2882aa087c21f3e588302236cf52abfcba7dbb6fd95","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:09:41.042564Z","signature_b64":"jchpfiXAXcurE78W7WtrO5d2PJBV3DZAUCF7apvtTS+mGIY9QNTzppjD/DolqYVYzW2yozt2MjvnTiDdot4IAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"3a3b24f8001480fa82dfe2882aa087c21f3e588302236cf52abfcba7dbb6fd95","last_reissued_at":"2026-05-18T01:09:41.041999Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:09:41.041999Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1608.02062","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":"2026-05-18T01:09:41Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"nJKQsQrdE+d9dZupXsIl2yFeE/CXrimks7B5Jj4Ixx3uDEsldDhtyfV+YlFwqF+/TUGYcrw3uGrwmMIgdhh7Bw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-23T06:01:52.287317Z"},"content_sha256":"fc91fbefb39c7adabe5f04a750134e823be4aee6a26b55855bd267489acfd438","schema_version":"1.0","event_id":"sha256:fc91fbefb39c7adabe5f04a750134e823be4aee6a26b55855bd267489acfd438"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:HI5SJ6AACSAPVAW74KECVIEHYI","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The primordial helium abundance and the number of neutrino families","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.GA"],"primary_cat":"astro-ph.CO","authors_text":"Antonio Peimbert, Manuel Peimbert, Valentina Luridiana","submitted_at":"2016-08-06T03:46:22Z","abstract_excerpt":"Based on observations of HII regions and the new computations of the recombination coefficients of the He I lines by Porter et al. (2013) we obtain a primordial helium abundance by mass of $Y_P = 0.2446\\pm0.0029$. We consider thirteen sources of error for the $Y_P$ determination, some of them are mainly due to systematic effects, while the rest are mainly due to statistical effects. We compare our results with other determinations of $Y_P$ present in the literature. Combining our $Y_P$ value with computations of primordial nucleosynthesis we find a number of neutrino species $N_{eff} = 2.90\\pm"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1608.02062","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":"2026-05-18T01:09:41Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"yUWmoGvFxIuRojXYqzUWAcaybfQWmzFr8KWaXCzN8smQoXr5FF1aVG0AMQ9XvGp2TIZCJv16L9CxpPhT2DZ0CQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-23T06:01:52.287777Z"},"content_sha256":"e4570257c5b9185aed9c7a5d6e6162bdd7a359b7a87c2b10d7887890f3554136","schema_version":"1.0","event_id":"sha256:e4570257c5b9185aed9c7a5d6e6162bdd7a359b7a87c2b10d7887890f3554136"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/HI5SJ6AACSAPVAW74KECVIEHYI/bundle.json","state_url":"https://pith.science/pith/HI5SJ6AACSAPVAW74KECVIEHYI/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/HI5SJ6AACSAPVAW74KECVIEHYI/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":"2026-08-23T06:01:52Z","links":{"resolver":"https://pith.science/pith/HI5SJ6AACSAPVAW74KECVIEHYI","bundle":"https://pith.science/pith/HI5SJ6AACSAPVAW74KECVIEHYI/bundle.json","state":"https://pith.science/pith/HI5SJ6AACSAPVAW74KECVIEHYI/state.json","well_known_bundle":"https://pith.science/.well-known/pith/HI5SJ6AACSAPVAW74KECVIEHYI/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:HI5SJ6AACSAPVAW74KECVIEHYI","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":"f07af51286475a7cc93be1f311b994942c52cfaadc3e8e743cf80b4cbe9bb250","cross_cats_sorted":["astro-ph.GA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2016-08-06T03:46:22Z","title_canon_sha256":"653097e26266be799310ab7ac3bc20578ae09a5a6ece0a28e19fb395a3a391c7"},"schema_version":"1.0","source":{"id":"1608.02062","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1608.02062","created_at":"2026-05-18T01:09:41Z"},{"alias_kind":"arxiv_version","alias_value":"1608.02062v1","created_at":"2026-05-18T01:09:41Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1608.02062","created_at":"2026-05-18T01:09:41Z"},{"alias_kind":"pith_short_12","alias_value":"HI5SJ6AACSAP","created_at":"2026-05-18T12:30:19Z"},{"alias_kind":"pith_short_16","alias_value":"HI5SJ6AACSAPVAW7","created_at":"2026-05-18T12:30:19Z"},{"alias_kind":"pith_short_8","alias_value":"HI5SJ6AA","created_at":"2026-05-18T12:30:19Z"}],"graph_snapshots":[{"event_id":"sha256:e4570257c5b9185aed9c7a5d6e6162bdd7a359b7a87c2b10d7887890f3554136","target":"graph","created_at":"2026-05-18T01:09:41Z","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":"Based on observations of HII regions and the new computations of the recombination coefficients of the He I lines by Porter et al. (2013) we obtain a primordial helium abundance by mass of $Y_P = 0.2446\\pm0.0029$. We consider thirteen sources of error for the $Y_P$ determination, some of them are mainly due to systematic effects, while the rest are mainly due to statistical effects. We compare our results with other determinations of $Y_P$ present in the literature. Combining our $Y_P$ value with computations of primordial nucleosynthesis we find a number of neutrino species $N_{eff} = 2.90\\pm","authors_text":"Antonio Peimbert, Manuel Peimbert, Valentina Luridiana","cross_cats":["astro-ph.GA"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2016-08-06T03:46:22Z","title":"The primordial helium abundance and the number of neutrino families"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1608.02062","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:fc91fbefb39c7adabe5f04a750134e823be4aee6a26b55855bd267489acfd438","target":"record","created_at":"2026-05-18T01:09:41Z","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":"f07af51286475a7cc93be1f311b994942c52cfaadc3e8e743cf80b4cbe9bb250","cross_cats_sorted":["astro-ph.GA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2016-08-06T03:46:22Z","title_canon_sha256":"653097e26266be799310ab7ac3bc20578ae09a5a6ece0a28e19fb395a3a391c7"},"schema_version":"1.0","source":{"id":"1608.02062","kind":"arxiv","version":1}},"canonical_sha256":"3a3b24f8001480fa82dfe2882aa087c21f3e588302236cf52abfcba7dbb6fd95","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"3a3b24f8001480fa82dfe2882aa087c21f3e588302236cf52abfcba7dbb6fd95","first_computed_at":"2026-05-18T01:09:41.041999Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:09:41.041999Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"jchpfiXAXcurE78W7WtrO5d2PJBV3DZAUCF7apvtTS+mGIY9QNTzppjD/DolqYVYzW2yozt2MjvnTiDdot4IAg==","signature_status":"signed_v1","signed_at":"2026-05-18T01:09:41.042564Z","signed_message":"canonical_sha256_bytes"},"source_id":"1608.02062","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:fc91fbefb39c7adabe5f04a750134e823be4aee6a26b55855bd267489acfd438","sha256:e4570257c5b9185aed9c7a5d6e6162bdd7a359b7a87c2b10d7887890f3554136"],"state_sha256":"078c363d7f504d07cf1cbc87e87fe8270ba4984f2943d01c73d9138f37e93f83"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"2qTd3Yk+tEqAh3byNpH4IHnhMH2S6VI6WXMbT6+tWK7W9PLwfTZstPoWzAZjhLOFHwg9gs/ePf6JvzyIXZqCBQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-23T06:01:52.292650Z","bundle_sha256":"6cd214fe2f5ab69b643803ba174ccf6fbba3d9ea771b2d10e10db5d8f5b13c2a"}}