{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2009:SMKQVPI6XYY54TWIGVB3WD3YN2","short_pith_number":"pith:SMKQVPI6","canonical_record":{"source":{"id":"0904.3163","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-04-21T04:57:04Z","cross_cats_sorted":[],"title_canon_sha256":"0a7e142d8a60f5aa10eafca820ef4793d5c2be9d9fecf80e0e876eb62e0e0175","abstract_canon_sha256":"3947f43607c39c53474a2c69776766b45a2372ee6b76f5acf41cb09fe27afc33"},"schema_version":"1.0"},"canonical_sha256":"93150abd1ebe31de4ec83543bb0f786ea5e791ff2c52811956466a5893b50044","source":{"kind":"arxiv","id":"0904.3163","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0904.3163","created_at":"2026-05-18T00:39:53Z"},{"alias_kind":"arxiv_version","alias_value":"0904.3163v1","created_at":"2026-05-18T00:39:53Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0904.3163","created_at":"2026-05-18T00:39:53Z"},{"alias_kind":"pith_short_12","alias_value":"SMKQVPI6XYY5","created_at":"2026-05-18T12:26:01Z"},{"alias_kind":"pith_short_16","alias_value":"SMKQVPI6XYY54TWI","created_at":"2026-05-18T12:26:01Z"},{"alias_kind":"pith_short_8","alias_value":"SMKQVPI6","created_at":"2026-05-18T12:26:01Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2009:SMKQVPI6XYY54TWIGVB3WD3YN2","target":"record","payload":{"canonical_record":{"source":{"id":"0904.3163","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-04-21T04:57:04Z","cross_cats_sorted":[],"title_canon_sha256":"0a7e142d8a60f5aa10eafca820ef4793d5c2be9d9fecf80e0e876eb62e0e0175","abstract_canon_sha256":"3947f43607c39c53474a2c69776766b45a2372ee6b76f5acf41cb09fe27afc33"},"schema_version":"1.0"},"canonical_sha256":"93150abd1ebe31de4ec83543bb0f786ea5e791ff2c52811956466a5893b50044","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:39:53.322285Z","signature_b64":"MqziRRg/2/Odsd3m7ac0a2ITMdvDeEOxpHjNDPDLUtOuht4EXmeOoL8vWuB/s2z8xAALXMhZjI6j4Uvf/g2ACA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"93150abd1ebe31de4ec83543bb0f786ea5e791ff2c52811956466a5893b50044","last_reissued_at":"2026-05-18T00:39:53.321643Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:39:53.321643Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0904.3163","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":"2026-05-18T00:39:53Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"K8KexmtJo4lVEmAZgGs3j5wWzBGKwR9W41jjcnnxUZ7plyH0LV4C90RH3HzDAMowtTu+5XmlTcmxkT+6ZB0gCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T03:25:41.130572Z"},"content_sha256":"f0d0529b9e950239c994e987777e2ca8b93affaf9522bac169af25276fa8b18b","schema_version":"1.0","event_id":"sha256:f0d0529b9e950239c994e987777e2ca8b93affaf9522bac169af25276fa8b18b"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2009:SMKQVPI6XYY54TWIGVB3WD3YN2","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Modification of the 21-cm power spectrum by quasars during the epoch of reionisation","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"J. Stuart B. Wyithe, Paul M. Geil","submitted_at":"2009-04-21T04:57:04Z","abstract_excerpt":"We assess the effect of a population of high-redshift quasars on the 21-cm power spectrum during the epoch of reionisation. Our approach is to implement a semi-numerical scheme to calculate the three-dimensional structure of ionised regions surrounding massive halos at high redshift. We include the ionising influence of luminous quasars by populating a simulated overdensity field with quasars using a Monte Carlo Markov Chain algorithm. We find that quasars modify both the amplitude and shape of the power spectrum at a level which is of the same order as the fractional contribution to reionisat"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0904.3163","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":"2026-05-18T00:39:53Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"/952uojGEK1HEiKG8ny0dQuO0nRyWDhdzcukD6DPYdHhHzdTHkZEhYfaXvVrBUu8VOqQ+f5o1KR7gL8AXmAUCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T03:25:41.130921Z"},"content_sha256":"aef3dd6a1b032b5bc5d342d7cd85cac20b6ebc321d15793771e35633fd466c12","schema_version":"1.0","event_id":"sha256:aef3dd6a1b032b5bc5d342d7cd85cac20b6ebc321d15793771e35633fd466c12"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/SMKQVPI6XYY54TWIGVB3WD3YN2/bundle.json","state_url":"https://pith.science/pith/SMKQVPI6XYY54TWIGVB3WD3YN2/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/SMKQVPI6XYY54TWIGVB3WD3YN2/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":"2026-06-01T03:25:41Z","links":{"resolver":"https://pith.science/pith/SMKQVPI6XYY54TWIGVB3WD3YN2","bundle":"https://pith.science/pith/SMKQVPI6XYY54TWIGVB3WD3YN2/bundle.json","state":"https://pith.science/pith/SMKQVPI6XYY54TWIGVB3WD3YN2/state.json","well_known_bundle":"https://pith.science/.well-known/pith/SMKQVPI6XYY54TWIGVB3WD3YN2/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:SMKQVPI6XYY54TWIGVB3WD3YN2","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":"3947f43607c39c53474a2c69776766b45a2372ee6b76f5acf41cb09fe27afc33","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-04-21T04:57:04Z","title_canon_sha256":"0a7e142d8a60f5aa10eafca820ef4793d5c2be9d9fecf80e0e876eb62e0e0175"},"schema_version":"1.0","source":{"id":"0904.3163","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0904.3163","created_at":"2026-05-18T00:39:53Z"},{"alias_kind":"arxiv_version","alias_value":"0904.3163v1","created_at":"2026-05-18T00:39:53Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0904.3163","created_at":"2026-05-18T00:39:53Z"},{"alias_kind":"pith_short_12","alias_value":"SMKQVPI6XYY5","created_at":"2026-05-18T12:26:01Z"},{"alias_kind":"pith_short_16","alias_value":"SMKQVPI6XYY54TWI","created_at":"2026-05-18T12:26:01Z"},{"alias_kind":"pith_short_8","alias_value":"SMKQVPI6","created_at":"2026-05-18T12:26:01Z"}],"graph_snapshots":[{"event_id":"sha256:aef3dd6a1b032b5bc5d342d7cd85cac20b6ebc321d15793771e35633fd466c12","target":"graph","created_at":"2026-05-18T00:39:53Z","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 assess the effect of a population of high-redshift quasars on the 21-cm power spectrum during the epoch of reionisation. Our approach is to implement a semi-numerical scheme to calculate the three-dimensional structure of ionised regions surrounding massive halos at high redshift. We include the ionising influence of luminous quasars by populating a simulated overdensity field with quasars using a Monte Carlo Markov Chain algorithm. We find that quasars modify both the amplitude and shape of the power spectrum at a level which is of the same order as the fractional contribution to reionisat","authors_text":"J. Stuart B. Wyithe, Paul M. Geil","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-04-21T04:57:04Z","title":"Modification of the 21-cm power spectrum by quasars during the epoch of reionisation"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0904.3163","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:f0d0529b9e950239c994e987777e2ca8b93affaf9522bac169af25276fa8b18b","target":"record","created_at":"2026-05-18T00:39:53Z","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":"3947f43607c39c53474a2c69776766b45a2372ee6b76f5acf41cb09fe27afc33","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-04-21T04:57:04Z","title_canon_sha256":"0a7e142d8a60f5aa10eafca820ef4793d5c2be9d9fecf80e0e876eb62e0e0175"},"schema_version":"1.0","source":{"id":"0904.3163","kind":"arxiv","version":1}},"canonical_sha256":"93150abd1ebe31de4ec83543bb0f786ea5e791ff2c52811956466a5893b50044","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"93150abd1ebe31de4ec83543bb0f786ea5e791ff2c52811956466a5893b50044","first_computed_at":"2026-05-18T00:39:53.321643Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:39:53.321643Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"MqziRRg/2/Odsd3m7ac0a2ITMdvDeEOxpHjNDPDLUtOuht4EXmeOoL8vWuB/s2z8xAALXMhZjI6j4Uvf/g2ACA==","signature_status":"signed_v1","signed_at":"2026-05-18T00:39:53.322285Z","signed_message":"canonical_sha256_bytes"},"source_id":"0904.3163","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:f0d0529b9e950239c994e987777e2ca8b93affaf9522bac169af25276fa8b18b","sha256:aef3dd6a1b032b5bc5d342d7cd85cac20b6ebc321d15793771e35633fd466c12"],"state_sha256":"d9934856a697682ac06e9743b2aca4e990266670416b539168e8d930c0b40710"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"H6XH1DHXi9bw9w7jmMMRWsescGzgJI10+UBeS3TGO6FuDod/7cfsm3U0NqHxDUcM8ywBjIFs0SyZYGZjUw2yCA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-01T03:25:41.133022Z","bundle_sha256":"8bbb4ce33bfc8d230736963a8c5606075490ef8a7948e0d0efd9ab67a182b1e7"}}