{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2003:ZY7HI5GX5NUWO2D3DKANRSY2IP","short_pith_number":"pith:ZY7HI5GX","canonical_record":{"source":{"id":"astro-ph/0310672","kind":"arxiv","version":2},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2003-10-23T00:59:37Z","cross_cats_sorted":[],"title_canon_sha256":"8b4211c54bdac4db90ee9cd317d5a2941a1ea23ef05fad0c222a800fda543515","abstract_canon_sha256":"aabf7b03e14182116788fe8c298be917d3d7c58dfcbc099641c954583e1aed1a"},"schema_version":"1.0"},"canonical_sha256":"ce3e7474d7eb6967687b1a80d8cb1a43db9b07de508cf08987a81301b6b5d9a7","source":{"kind":"arxiv","id":"astro-ph/0310672","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/0310672","created_at":"2026-05-18T01:09:03Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0310672v2","created_at":"2026-05-18T01:09:03Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0310672","created_at":"2026-05-18T01:09:03Z"},{"alias_kind":"pith_short_12","alias_value":"ZY7HI5GX5NUW","created_at":"2026-05-18T12:25:52Z"},{"alias_kind":"pith_short_16","alias_value":"ZY7HI5GX5NUWO2D3","created_at":"2026-05-18T12:25:52Z"},{"alias_kind":"pith_short_8","alias_value":"ZY7HI5GX","created_at":"2026-05-18T12:25:52Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2003:ZY7HI5GX5NUWO2D3DKANRSY2IP","target":"record","payload":{"canonical_record":{"source":{"id":"astro-ph/0310672","kind":"arxiv","version":2},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2003-10-23T00:59:37Z","cross_cats_sorted":[],"title_canon_sha256":"8b4211c54bdac4db90ee9cd317d5a2941a1ea23ef05fad0c222a800fda543515","abstract_canon_sha256":"aabf7b03e14182116788fe8c298be917d3d7c58dfcbc099641c954583e1aed1a"},"schema_version":"1.0"},"canonical_sha256":"ce3e7474d7eb6967687b1a80d8cb1a43db9b07de508cf08987a81301b6b5d9a7","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:09:03.409778Z","signature_b64":"FMmSwvnOo6JZ+EySyyWNQ6mRDws0JWN8KmLZm4u7noRP9+ieKbPdlr2j7FmF0vA9fEMBhTjrFERiEpffE9PSCA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"ce3e7474d7eb6967687b1a80d8cb1a43db9b07de508cf08987a81301b6b5d9a7","last_reissued_at":"2026-05-18T01:09:03.409400Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:09:03.409400Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"astro-ph/0310672","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:09:03Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"kHzVa0/IcxFU19ArAsEINEGG6iC5g1zepG6g/yZ9PA11Py41Rh0gGsFTgWodN9vgvMGrz99OU0t5/KaDRYyTBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-06T15:56:37.349831Z"},"content_sha256":"2e294a048586d1227f9e2e3d219c99d0f6c0629fa4b2b0cc3ca225cfb9a6a26a","schema_version":"1.0","event_id":"sha256:2e294a048586d1227f9e2e3d219c99d0f6c0629fa4b2b0cc3ca225cfb9a6a26a"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2003:ZY7HI5GX5NUWO2D3DKANRSY2IP","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Atomic and Molecular Absorption at High Redshift","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"J. K. Webb, M. T. Murphy, S. J. Curran, Y. M. Pihlstr\\\"om","submitted_at":"2003-10-23T00:59:37Z","abstract_excerpt":"Strong constraints on possible variations in fundamental constants can be derived from HI 21-cm and molecular rotational absorption lines observed towards quasars. With the aim of forming a statistical sample of constraints we have begun a program of systematic searches for such absorption systems. Here we describe molecular rotational searches in 25 damped Lyman-alpha systems where, in many cases, we set optical depth limits an order of magnitude better than that required to detect the 4 known redshifted millimeter-wave absorbers. We also discuss the contributory factors in the detectability "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0310672","kind":"arxiv","version":2},"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":"2026-05-18T01:09:03Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"B41v3pEYr4WzSSPLPteukl0+pxni2i/Xcb0ygykaOAD9ZvOUWhkLSVQDnm8Acvvx+YfAA2M5xIT0xGk+3z2MBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-06T15:56:37.350186Z"},"content_sha256":"63415426b3467752f3d08283d57d82925776636a8fc75747641a60785d69c647","schema_version":"1.0","event_id":"sha256:63415426b3467752f3d08283d57d82925776636a8fc75747641a60785d69c647"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/ZY7HI5GX5NUWO2D3DKANRSY2IP/bundle.json","state_url":"https://pith.science/pith/ZY7HI5GX5NUWO2D3DKANRSY2IP/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/ZY7HI5GX5NUWO2D3DKANRSY2IP/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":"2026-06-06T15:56:37Z","links":{"resolver":"https://pith.science/pith/ZY7HI5GX5NUWO2D3DKANRSY2IP","bundle":"https://pith.science/pith/ZY7HI5GX5NUWO2D3DKANRSY2IP/bundle.json","state":"https://pith.science/pith/ZY7HI5GX5NUWO2D3DKANRSY2IP/state.json","well_known_bundle":"https://pith.science/.well-known/pith/ZY7HI5GX5NUWO2D3DKANRSY2IP/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2003:ZY7HI5GX5NUWO2D3DKANRSY2IP","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":"aabf7b03e14182116788fe8c298be917d3d7c58dfcbc099641c954583e1aed1a","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2003-10-23T00:59:37Z","title_canon_sha256":"8b4211c54bdac4db90ee9cd317d5a2941a1ea23ef05fad0c222a800fda543515"},"schema_version":"1.0","source":{"id":"astro-ph/0310672","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/0310672","created_at":"2026-05-18T01:09:03Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0310672v2","created_at":"2026-05-18T01:09:03Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0310672","created_at":"2026-05-18T01:09:03Z"},{"alias_kind":"pith_short_12","alias_value":"ZY7HI5GX5NUW","created_at":"2026-05-18T12:25:52Z"},{"alias_kind":"pith_short_16","alias_value":"ZY7HI5GX5NUWO2D3","created_at":"2026-05-18T12:25:52Z"},{"alias_kind":"pith_short_8","alias_value":"ZY7HI5GX","created_at":"2026-05-18T12:25:52Z"}],"graph_snapshots":[{"event_id":"sha256:63415426b3467752f3d08283d57d82925776636a8fc75747641a60785d69c647","target":"graph","created_at":"2026-05-18T01:09:03Z","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":"Strong constraints on possible variations in fundamental constants can be derived from HI 21-cm and molecular rotational absorption lines observed towards quasars. With the aim of forming a statistical sample of constraints we have begun a program of systematic searches for such absorption systems. Here we describe molecular rotational searches in 25 damped Lyman-alpha systems where, in many cases, we set optical depth limits an order of magnitude better than that required to detect the 4 known redshifted millimeter-wave absorbers. We also discuss the contributory factors in the detectability ","authors_text":"J. K. Webb, M. T. Murphy, S. J. Curran, Y. M. Pihlstr\\\"om","cross_cats":[],"headline":"","license":"","primary_cat":"astro-ph","submitted_at":"2003-10-23T00:59:37Z","title":"Atomic and Molecular Absorption at High Redshift"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0310672","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":"sha256:2e294a048586d1227f9e2e3d219c99d0f6c0629fa4b2b0cc3ca225cfb9a6a26a","target":"record","created_at":"2026-05-18T01:09:03Z","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":"aabf7b03e14182116788fe8c298be917d3d7c58dfcbc099641c954583e1aed1a","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2003-10-23T00:59:37Z","title_canon_sha256":"8b4211c54bdac4db90ee9cd317d5a2941a1ea23ef05fad0c222a800fda543515"},"schema_version":"1.0","source":{"id":"astro-ph/0310672","kind":"arxiv","version":2}},"canonical_sha256":"ce3e7474d7eb6967687b1a80d8cb1a43db9b07de508cf08987a81301b6b5d9a7","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"ce3e7474d7eb6967687b1a80d8cb1a43db9b07de508cf08987a81301b6b5d9a7","first_computed_at":"2026-05-18T01:09:03.409400Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:09:03.409400Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"FMmSwvnOo6JZ+EySyyWNQ6mRDws0JWN8KmLZm4u7noRP9+ieKbPdlr2j7FmF0vA9fEMBhTjrFERiEpffE9PSCA==","signature_status":"signed_v1","signed_at":"2026-05-18T01:09:03.409778Z","signed_message":"canonical_sha256_bytes"},"source_id":"astro-ph/0310672","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:2e294a048586d1227f9e2e3d219c99d0f6c0629fa4b2b0cc3ca225cfb9a6a26a","sha256:63415426b3467752f3d08283d57d82925776636a8fc75747641a60785d69c647"],"state_sha256":"cb664dba16ceafb089b827a15e4288cd1b9c294581f4daa3d1815a8a364f2cfe"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"eK/BjoVgolnMVEZ8ihvvurzYpLgHK4o9LHXhfA1mpK4ATpS+D7LgNvKGVDQ5DpYZI6cKvWvQw3O7l4iT1OJpBw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-06T15:56:37.352433Z","bundle_sha256":"a4e8bca9fe7f75fd2086470b0191c00697d9120ac8a7bce36880a6a31174aa5f"}}