{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2018:UOPQQGTDB2267KUI3FOE5GUWH2","short_pith_number":"pith:UOPQQGTD","schema_version":"1.0","canonical_sha256":"a39f081a630eb5efaa88d95c4e9a963e80711d7c7cea439572952381c1c332ef","source":{"kind":"arxiv","id":"1807.00836","version":2},"attestation_state":"computed","paper":{"title":"Photon number conservation and the large-scale 21 cm power spectrum in semi-numerical models of reionization","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"Aseem Paranjape, T. Roy Choudhury","submitted_at":"2018-07-02T18:00:50Z","abstract_excerpt":"Semi-numerical models of the reionization of neutral hydrogen (HI) based on the excursion set (ES) approach are known to violate photon number conservation at the few per cent level. In this work, we highlight a more severe, previously unrecognized shortcoming of ES models: the large-scale 21 cm power spectrum (equivalently, HI bias b_HI) is a relatively strong function of the spatial resolution used to generate ES ionization maps. We trace this problem to the fact that photon non-conservation in these models arises from a resolution-dependent mixture of spatially resolved, photon non-conservi"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1807.00836","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2018-07-02T18:00:50Z","cross_cats_sorted":[],"title_canon_sha256":"ac1bcd06417aae01b9a6a21b9f942ab2a99666ab7ad7e05b3a843059272b7706","abstract_canon_sha256":"51d5e2bbf240580b8e754d1d43917cfd3e731796de74edb9f049027e292c69ea"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:04:55.690682Z","signature_b64":"ZsH6IJRdMcrGXNatnP65MhnIHpWMdHOBtE9dDHlLAHfZ/JpYMF3Nkd2um7Z7KIsj/BuMyc3oZ1TGeUjXHXY6AA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"a39f081a630eb5efaa88d95c4e9a963e80711d7c7cea439572952381c1c332ef","last_reissued_at":"2026-05-18T00:04:55.689818Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:04:55.689818Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Photon number conservation and the large-scale 21 cm power spectrum in semi-numerical models of reionization","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"Aseem Paranjape, T. Roy Choudhury","submitted_at":"2018-07-02T18:00:50Z","abstract_excerpt":"Semi-numerical models of the reionization of neutral hydrogen (HI) based on the excursion set (ES) approach are known to violate photon number conservation at the few per cent level. In this work, we highlight a more severe, previously unrecognized shortcoming of ES models: the large-scale 21 cm power spectrum (equivalently, HI bias b_HI) is a relatively strong function of the spatial resolution used to generate ES ionization maps. We trace this problem to the fact that photon non-conservation in these models arises from a resolution-dependent mixture of spatially resolved, photon non-conservi"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1807.00836","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"},"aliases":[{"alias_kind":"arxiv","alias_value":"1807.00836","created_at":"2026-05-18T00:04:55.689949+00:00"},{"alias_kind":"arxiv_version","alias_value":"1807.00836v2","created_at":"2026-05-18T00:04:55.689949+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1807.00836","created_at":"2026-05-18T00:04:55.689949+00:00"},{"alias_kind":"pith_short_12","alias_value":"UOPQQGTDB226","created_at":"2026-05-18T12:32:56.356000+00:00"},{"alias_kind":"pith_short_16","alias_value":"UOPQQGTDB2267KUI","created_at":"2026-05-18T12:32:56.356000+00:00"},{"alias_kind":"pith_short_8","alias_value":"UOPQQGTD","created_at":"2026-05-18T12:32:56.356000+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":1,"internal_anchor_count":1,"sample":[{"citing_arxiv_id":"2602.15803","citing_title":"Nearest Neighbour-Based Statistics for 21cm-Galaxy Cross-Correlations in the Epoch of Reionization","ref_index":116,"is_internal_anchor":true}]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/UOPQQGTDB2267KUI3FOE5GUWH2","json":"https://pith.science/pith/UOPQQGTDB2267KUI3FOE5GUWH2.json","graph_json":"https://pith.science/api/pith-number/UOPQQGTDB2267KUI3FOE5GUWH2/graph.json","events_json":"https://pith.science/api/pith-number/UOPQQGTDB2267KUI3FOE5GUWH2/events.json","paper":"https://pith.science/paper/UOPQQGTD"},"agent_actions":{"view_html":"https://pith.science/pith/UOPQQGTDB2267KUI3FOE5GUWH2","download_json":"https://pith.science/pith/UOPQQGTDB2267KUI3FOE5GUWH2.json","view_paper":"https://pith.science/paper/UOPQQGTD","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1807.00836&json=true","fetch_graph":"https://pith.science/api/pith-number/UOPQQGTDB2267KUI3FOE5GUWH2/graph.json","fetch_events":"https://pith.science/api/pith-number/UOPQQGTDB2267KUI3FOE5GUWH2/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/UOPQQGTDB2267KUI3FOE5GUWH2/action/timestamp_anchor","attest_storage":"https://pith.science/pith/UOPQQGTDB2267KUI3FOE5GUWH2/action/storage_attestation","attest_author":"https://pith.science/pith/UOPQQGTDB2267KUI3FOE5GUWH2/action/author_attestation","sign_citation":"https://pith.science/pith/UOPQQGTDB2267KUI3FOE5GUWH2/action/citation_signature","submit_replication":"https://pith.science/pith/UOPQQGTDB2267KUI3FOE5GUWH2/action/replication_record"}},"created_at":"2026-05-18T00:04:55.689949+00:00","updated_at":"2026-05-18T00:04:55.689949+00:00"}