{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2002:5O4JXFZLS5HMDEX2LAL46MNRYS","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":"9c7db764efe58e86e53cc041204832c6c54ed24c91bb8296cea2ae23ecdd9563","cross_cats_sorted":["hep-th"],"license":"","primary_cat":"astro-ph","submitted_at":"2002-03-18T10:50:45Z","title_canon_sha256":"e9dd67fcb231e997873c3ecb5823a9fece9a757431a1a6b4109905f62f52b529"},"schema_version":"1.0","source":{"id":"astro-ph/0203272","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/0203272","created_at":"2026-07-04T16:29:33Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0203272v2","created_at":"2026-07-04T16:29:33Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0203272","created_at":"2026-07-04T16:29:33Z"},{"alias_kind":"pith_short_12","alias_value":"5O4JXFZLS5HM","created_at":"2026-07-04T16:29:33Z"},{"alias_kind":"pith_short_16","alias_value":"5O4JXFZLS5HMDEX2","created_at":"2026-07-04T16:29:33Z"},{"alias_kind":"pith_short_8","alias_value":"5O4JXFZL","created_at":"2026-07-04T16:29:33Z"}],"graph_snapshots":[{"event_id":"sha256:f9fdf78e00b93ad45b36674090693928d7ec6269711abdcd7d71980b07b1e04b","target":"graph","created_at":"2026-07-04T16:29:33Z","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/astro-ph/0203272/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We analyze the observational constraints on brane-world cosmology whereby the universe is described as a three-brane embedded in a five-dimensional anti-de Sitter space.\n  In this brane-universe cosmology, the Friedmann equation is modified by the appearance of extra terms which derive from existence of the extra dimensions.\n  In the present work we concentrate on the ``dark radiation'' term which diminishes with cosmic scale factor as $a^{-4}$.\n  We show that, although the observational constraints from primordial abundances allow only a small contribution when this term is positive, a much w","authors_text":"G. J. Mathews, K. Ichiki, M. Orito, M. Yahiro, T. Kajino","cross_cats":["hep-th"],"headline":"","license":"","primary_cat":"astro-ph","submitted_at":"2002-03-18T10:50:45Z","title":"Observational Constraints on Dark Radiation in Brane Cosmology"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0203272","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":"sha256:95c7167b3f530baa0f4f81905903875db59dd8cbede3865ef8b1f0c089a7ca6a","target":"record","created_at":"2026-07-04T16:29:33Z","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":"9c7db764efe58e86e53cc041204832c6c54ed24c91bb8296cea2ae23ecdd9563","cross_cats_sorted":["hep-th"],"license":"","primary_cat":"astro-ph","submitted_at":"2002-03-18T10:50:45Z","title_canon_sha256":"e9dd67fcb231e997873c3ecb5823a9fece9a757431a1a6b4109905f62f52b529"},"schema_version":"1.0","source":{"id":"astro-ph/0203272","kind":"arxiv","version":2}},"canonical_sha256":"ebb89b972b974ec192fa5817cf31b1c4ad9d13d0db46c1131738c99b8d05ead3","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"ebb89b972b974ec192fa5817cf31b1c4ad9d13d0db46c1131738c99b8d05ead3","first_computed_at":"2026-07-04T16:29:33.503154Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T16:29:33.503154Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"j1TUzpFMpqkf34hxOKXvBsaZHt8iZhZaCc5H3VdtpWfKdtTO03gtvgqrQYoULYaLxgrzQ+QT/KrlnVLiL/a+Cg==","signature_status":"signed_v1","signed_at":"2026-07-04T16:29:33.503616Z","signed_message":"canonical_sha256_bytes"},"source_id":"astro-ph/0203272","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:95c7167b3f530baa0f4f81905903875db59dd8cbede3865ef8b1f0c089a7ca6a","sha256:f9fdf78e00b93ad45b36674090693928d7ec6269711abdcd7d71980b07b1e04b"],"state_sha256":"e7263abc16480937f00e6362dfb7a3e9b1059f83d9d4ee65c5dd20a13f08af6a"}