{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:1997:RY7VCSAW7XFI55JYWND3EO4KV7","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":"22d89e720872130523f691e67a22b11400736018ec63f629b0ef2f114b603962","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"1997-01-13T19:33:23Z","title_canon_sha256":"593081830a630175cb853b8dd621243cf880c476fe33b090f9c95ccd2c9887d2"},"schema_version":"1.0","source":{"id":"astro-ph/9701063","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/9701063","created_at":"2026-05-18T01:07:40Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/9701063v1","created_at":"2026-05-18T01:07:40Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/9701063","created_at":"2026-05-18T01:07:40Z"},{"alias_kind":"pith_short_12","alias_value":"RY7VCSAW7XFI","created_at":"2026-05-18T12:25:48Z"},{"alias_kind":"pith_short_16","alias_value":"RY7VCSAW7XFI55JY","created_at":"2026-05-18T12:25:48Z"},{"alias_kind":"pith_short_8","alias_value":"RY7VCSAW","created_at":"2026-05-18T12:25:48Z"}],"graph_snapshots":[{"event_id":"sha256:5612c7640bc75e928fdcf2113e6a3e3092c87d186ef8090514dd5c21dffe31d3","target":"graph","created_at":"2026-05-18T01:07:40Z","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 derive an upper limit of $B_0<3.4\\times 10^{-9}(\\Omega_0h_{50}^2)^{1/2}$ Gauss on the present strength of any primordial homogeneous magnetic field. The microwave background anisotropy created by cosmological magnetic fields is calculated in the most general flat and open anisotropic cosmologies containing expansion-rate and 3-curvature anisotropies. Our limit is derived from a statistical analysis of the 4-year Cosmic Background Explorer data for anisotropy patterns characteristic of homogeneous anisotropy averaged over all possible sky orientations with respect to the COBE receiver. The l","authors_text":"John D. Barrow, Joseph Silk, Pedro G. Ferreira","cross_cats":[],"headline":"","license":"","primary_cat":"astro-ph","submitted_at":"1997-01-13T19:33:23Z","title":"Constraints on a Primordial Magnetic Field"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/9701063","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:c88cb23c75a80a6ba45f139ce4eb9a9a7210e76c146bae38d86e678adf8156dc","target":"record","created_at":"2026-05-18T01:07:40Z","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":"22d89e720872130523f691e67a22b11400736018ec63f629b0ef2f114b603962","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"1997-01-13T19:33:23Z","title_canon_sha256":"593081830a630175cb853b8dd621243cf880c476fe33b090f9c95ccd2c9887d2"},"schema_version":"1.0","source":{"id":"astro-ph/9701063","kind":"arxiv","version":1}},"canonical_sha256":"8e3f514816fdca8ef538b347b23b8aafc0b53008590d48d392e9e7e3cebbc3c7","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"8e3f514816fdca8ef538b347b23b8aafc0b53008590d48d392e9e7e3cebbc3c7","first_computed_at":"2026-05-18T01:07:40.303466Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:07:40.303466Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"X7ZlZqxxQAlNDHitswJNvmE0uadkA6L74ewham6xdabMGoqZHXVpW5ZJk3X/v4EC282VkEAyNX7r2jSNUS0aBQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:07:40.303886Z","signed_message":"canonical_sha256_bytes"},"source_id":"astro-ph/9701063","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:c88cb23c75a80a6ba45f139ce4eb9a9a7210e76c146bae38d86e678adf8156dc","sha256:5612c7640bc75e928fdcf2113e6a3e3092c87d186ef8090514dd5c21dffe31d3"],"state_sha256":"e979622d6b3e7f4cae97165b6850387abd52b9fe2cb234edac7930640b4cf1a2"}