{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2009:HQEWTC3NZCH6GK4RRWPGKM7EB6","short_pith_number":"pith:HQEWTC3N","canonical_record":{"source":{"id":"0911.2219","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-11-11T20:49:54Z","cross_cats_sorted":[],"title_canon_sha256":"c2c9d4fe3db8f1b1ab51036167f67c0183dc294f91b309229b6fff3225c5f163","abstract_canon_sha256":"9f7cd99e33411382d02b51c8bd85ae2cb05112f9b82deadc64ab611b7ff20d21"},"schema_version":"1.0"},"canonical_sha256":"3c09698b6dc88fe32b918d9e6533e40f95fc6e40cfcd0adce6de424c35969aef","source":{"kind":"arxiv","id":"0911.2219","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0911.2219","created_at":"2026-05-18T02:34:11Z"},{"alias_kind":"arxiv_version","alias_value":"0911.2219v2","created_at":"2026-05-18T02:34:11Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0911.2219","created_at":"2026-05-18T02:34:11Z"},{"alias_kind":"pith_short_12","alias_value":"HQEWTC3NZCH6","created_at":"2026-05-18T12:25:59Z"},{"alias_kind":"pith_short_16","alias_value":"HQEWTC3NZCH6GK4R","created_at":"2026-05-18T12:25:59Z"},{"alias_kind":"pith_short_8","alias_value":"HQEWTC3N","created_at":"2026-05-18T12:25:59Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2009:HQEWTC3NZCH6GK4RRWPGKM7EB6","target":"record","payload":{"canonical_record":{"source":{"id":"0911.2219","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-11-11T20:49:54Z","cross_cats_sorted":[],"title_canon_sha256":"c2c9d4fe3db8f1b1ab51036167f67c0183dc294f91b309229b6fff3225c5f163","abstract_canon_sha256":"9f7cd99e33411382d02b51c8bd85ae2cb05112f9b82deadc64ab611b7ff20d21"},"schema_version":"1.0"},"canonical_sha256":"3c09698b6dc88fe32b918d9e6533e40f95fc6e40cfcd0adce6de424c35969aef","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:34:11.186532Z","signature_b64":"QTGuSjU9Q+nVHb1LfmMPxZgovNMHwC9oHd2OWMr3qludVOUpn0Mk7dzhRDQX+VaKhbDr4AvqrdPo+wuh5YahCA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"3c09698b6dc88fe32b918d9e6533e40f95fc6e40cfcd0adce6de424c35969aef","last_reissued_at":"2026-05-18T02:34:11.186119Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:34:11.186119Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0911.2219","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":"2026-05-18T02:34:11Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"3mV3EwXQJNiRMOam5asa9w/NN+ho1JYNoHjFpZ6FQ/kjb7lFt67DSXQPJJk00/i3kYDtlqud6mQUMYjk9FtyBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-16T08:04:47.551894Z"},"content_sha256":"f601645f047028cf6ed3e45ef8f5320ac150e67349c1f9880711f1085ee7f9b5","schema_version":"1.0","event_id":"sha256:f601645f047028cf6ed3e45ef8f5320ac150e67349c1f9880711f1085ee7f9b5"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2009:HQEWTC3NZCH6GK4RRWPGKM7EB6","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Fast Large Volume Simulations of the 21 cm Signal from the Reionization and pre-Reionization Epochs","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"(2) UC Irvine), A. Amblard (2), A. Cooray (2) ((1) CENTRA - IST, L. Ferramacho (1), M. B. Silva (1), M. G. Santos (1)","submitted_at":"2009-11-11T20:49:54Z","abstract_excerpt":"While limited to low spatial resolution, the next generation low-frequency radio interferometers that target 21 cm observations during the era of reionization and prior will have instantaneous fields-of-view that are many tens of square degrees on the sky. Predictions related to various statistical measurements of the 21 cm brightness temperature must then be pursued with numerical simulations of reionization with correspondingly large volume box sizes, of order 1000 Mpc on one side. We pursue a semi-numerical scheme to simulate the 21 cm signal during and prior to Reionization by extending a "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0911.2219","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":"2026-05-18T02:34:11Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"SlanE5N6ZzhaRgi5uKJa23jghcstY25Fo9EHkPtqld8taZQcMoYC9KpX/1D8wDdfvW/Qz/NRDUIkvY+kEeg+CQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-16T08:04:47.552434Z"},"content_sha256":"65c37ee2a096a32d416bb0c7da8ef35cb18d8766c0b46f3ab0d870c9e98fd6ce","schema_version":"1.0","event_id":"sha256:65c37ee2a096a32d416bb0c7da8ef35cb18d8766c0b46f3ab0d870c9e98fd6ce"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/HQEWTC3NZCH6GK4RRWPGKM7EB6/bundle.json","state_url":"https://pith.science/pith/HQEWTC3NZCH6GK4RRWPGKM7EB6/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/HQEWTC3NZCH6GK4RRWPGKM7EB6/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":"2026-08-16T08:04:47Z","links":{"resolver":"https://pith.science/pith/HQEWTC3NZCH6GK4RRWPGKM7EB6","bundle":"https://pith.science/pith/HQEWTC3NZCH6GK4RRWPGKM7EB6/bundle.json","state":"https://pith.science/pith/HQEWTC3NZCH6GK4RRWPGKM7EB6/state.json","well_known_bundle":"https://pith.science/.well-known/pith/HQEWTC3NZCH6GK4RRWPGKM7EB6/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:HQEWTC3NZCH6GK4RRWPGKM7EB6","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":"9f7cd99e33411382d02b51c8bd85ae2cb05112f9b82deadc64ab611b7ff20d21","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-11-11T20:49:54Z","title_canon_sha256":"c2c9d4fe3db8f1b1ab51036167f67c0183dc294f91b309229b6fff3225c5f163"},"schema_version":"1.0","source":{"id":"0911.2219","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0911.2219","created_at":"2026-05-18T02:34:11Z"},{"alias_kind":"arxiv_version","alias_value":"0911.2219v2","created_at":"2026-05-18T02:34:11Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0911.2219","created_at":"2026-05-18T02:34:11Z"},{"alias_kind":"pith_short_12","alias_value":"HQEWTC3NZCH6","created_at":"2026-05-18T12:25:59Z"},{"alias_kind":"pith_short_16","alias_value":"HQEWTC3NZCH6GK4R","created_at":"2026-05-18T12:25:59Z"},{"alias_kind":"pith_short_8","alias_value":"HQEWTC3N","created_at":"2026-05-18T12:25:59Z"}],"graph_snapshots":[{"event_id":"sha256:65c37ee2a096a32d416bb0c7da8ef35cb18d8766c0b46f3ab0d870c9e98fd6ce","target":"graph","created_at":"2026-05-18T02:34:11Z","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":"While limited to low spatial resolution, the next generation low-frequency radio interferometers that target 21 cm observations during the era of reionization and prior will have instantaneous fields-of-view that are many tens of square degrees on the sky. Predictions related to various statistical measurements of the 21 cm brightness temperature must then be pursued with numerical simulations of reionization with correspondingly large volume box sizes, of order 1000 Mpc on one side. We pursue a semi-numerical scheme to simulate the 21 cm signal during and prior to Reionization by extending a ","authors_text":"(2) UC Irvine), A. Amblard (2), A. Cooray (2) ((1) CENTRA - IST, L. Ferramacho (1), M. B. Silva (1), M. G. Santos (1)","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-11-11T20:49:54Z","title":"Fast Large Volume Simulations of the 21 cm Signal from the Reionization and pre-Reionization Epochs"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0911.2219","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:f601645f047028cf6ed3e45ef8f5320ac150e67349c1f9880711f1085ee7f9b5","target":"record","created_at":"2026-05-18T02:34:11Z","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":"9f7cd99e33411382d02b51c8bd85ae2cb05112f9b82deadc64ab611b7ff20d21","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-11-11T20:49:54Z","title_canon_sha256":"c2c9d4fe3db8f1b1ab51036167f67c0183dc294f91b309229b6fff3225c5f163"},"schema_version":"1.0","source":{"id":"0911.2219","kind":"arxiv","version":2}},"canonical_sha256":"3c09698b6dc88fe32b918d9e6533e40f95fc6e40cfcd0adce6de424c35969aef","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"3c09698b6dc88fe32b918d9e6533e40f95fc6e40cfcd0adce6de424c35969aef","first_computed_at":"2026-05-18T02:34:11.186119Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:34:11.186119Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"QTGuSjU9Q+nVHb1LfmMPxZgovNMHwC9oHd2OWMr3qludVOUpn0Mk7dzhRDQX+VaKhbDr4AvqrdPo+wuh5YahCA==","signature_status":"signed_v1","signed_at":"2026-05-18T02:34:11.186532Z","signed_message":"canonical_sha256_bytes"},"source_id":"0911.2219","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:f601645f047028cf6ed3e45ef8f5320ac150e67349c1f9880711f1085ee7f9b5","sha256:65c37ee2a096a32d416bb0c7da8ef35cb18d8766c0b46f3ab0d870c9e98fd6ce"],"state_sha256":"12bd99ffd1db08653e533598945e104419437c6d54c8542526ab188e2e302d71"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"nYe0yd7XDCtt2aA81PEyfUzuJm93kA5ab3L6gK8q0vJp8qmcO4m6Jzp30C5x8aGTrpG2pbUpWY7ZHA+BcCWlAA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-16T08:04:47.557941Z","bundle_sha256":"d8176f7c971fab23093ed29fe3349265ddf84d50266acfd947f9951acacea317"}}