{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2015:26HPBDCMILMA6GENSVFMCPDPLT","short_pith_number":"pith:26HPBDCM","schema_version":"1.0","canonical_sha256":"d78ef08c4c42d80f188d954ac13c6f5cc8de837c058da7adc306575c66628dbc","source":{"kind":"arxiv","id":"1503.07168","version":2},"attestation_state":"computed","paper":{"title":"Photon underproduction crisis: Are QSOs sufficient to resolve it?","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"Raghunathan Srianand, Vikram Khaire","submitted_at":"2015-03-24T20:00:21Z","abstract_excerpt":"We investigate the recent claim of 'photon underproduction crisis' by Kollmeier et al. (2014) which suggests that the known sources of ultra-violet (UV) radiation may not be sufficient to generate the inferred hydrogen photoionization rate ($\\Gamma_{\\rm HI}$) in the low redshift inter-galactic medium. Using the updated QSO emissivities from the recent studies and our cosmological radiative transfer code developed to estimate the UV background, we show that the QSO contribution to $\\Gamma_{\\rm HI}$ is higher by a factor ~2 as compared to the previous estimates. Using self-consistently computed "},"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":"1503.07168","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2015-03-24T20:00:21Z","cross_cats_sorted":[],"title_canon_sha256":"95999ec6b9901dd30ecff0d4515d3ed52c99cd1759d08fbe8b272118dd616a4e","abstract_canon_sha256":"21d017f8dae1b1ec41b932c077b6dfb1872d9cfff0c79d35b9bad771d744c5c6"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:04:50.633089Z","signature_b64":"BnMxMxfOaOjM/e0EG9REpmADgb5LryhW66prUTjTjFE3Tm54qdsyYQFIwf01gsb4ASKXE0lgFVPhxDgZQCZTAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"d78ef08c4c42d80f188d954ac13c6f5cc8de837c058da7adc306575c66628dbc","last_reissued_at":"2026-05-18T01:04:50.632641Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:04:50.632641Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Photon underproduction crisis: Are QSOs sufficient to resolve it?","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"Raghunathan Srianand, Vikram Khaire","submitted_at":"2015-03-24T20:00:21Z","abstract_excerpt":"We investigate the recent claim of 'photon underproduction crisis' by Kollmeier et al. (2014) which suggests that the known sources of ultra-violet (UV) radiation may not be sufficient to generate the inferred hydrogen photoionization rate ($\\Gamma_{\\rm HI}$) in the low redshift inter-galactic medium. Using the updated QSO emissivities from the recent studies and our cosmological radiative transfer code developed to estimate the UV background, we show that the QSO contribution to $\\Gamma_{\\rm HI}$ is higher by a factor ~2 as compared to the previous estimates. Using self-consistently computed "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1503.07168","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":"1503.07168","created_at":"2026-05-18T01:04:50.632719+00:00"},{"alias_kind":"arxiv_version","alias_value":"1503.07168v2","created_at":"2026-05-18T01:04:50.632719+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1503.07168","created_at":"2026-05-18T01:04:50.632719+00:00"},{"alias_kind":"pith_short_12","alias_value":"26HPBDCMILMA","created_at":"2026-05-18T12:28:59.999130+00:00"},{"alias_kind":"pith_short_16","alias_value":"26HPBDCMILMA6GEN","created_at":"2026-05-18T12:28:59.999130+00:00"},{"alias_kind":"pith_short_8","alias_value":"26HPBDCM","created_at":"2026-05-18T12:28:59.999130+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":1,"internal_anchor_count":1,"sample":[{"citing_arxiv_id":"2605.22489","citing_title":"Machine Learning Techniques for Astrophysics and Cosmology: Lyman-$\\alpha$ forest","ref_index":74,"is_internal_anchor":true}]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/26HPBDCMILMA6GENSVFMCPDPLT","json":"https://pith.science/pith/26HPBDCMILMA6GENSVFMCPDPLT.json","graph_json":"https://pith.science/api/pith-number/26HPBDCMILMA6GENSVFMCPDPLT/graph.json","events_json":"https://pith.science/api/pith-number/26HPBDCMILMA6GENSVFMCPDPLT/events.json","paper":"https://pith.science/paper/26HPBDCM"},"agent_actions":{"view_html":"https://pith.science/pith/26HPBDCMILMA6GENSVFMCPDPLT","download_json":"https://pith.science/pith/26HPBDCMILMA6GENSVFMCPDPLT.json","view_paper":"https://pith.science/paper/26HPBDCM","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1503.07168&json=true","fetch_graph":"https://pith.science/api/pith-number/26HPBDCMILMA6GENSVFMCPDPLT/graph.json","fetch_events":"https://pith.science/api/pith-number/26HPBDCMILMA6GENSVFMCPDPLT/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/26HPBDCMILMA6GENSVFMCPDPLT/action/timestamp_anchor","attest_storage":"https://pith.science/pith/26HPBDCMILMA6GENSVFMCPDPLT/action/storage_attestation","attest_author":"https://pith.science/pith/26HPBDCMILMA6GENSVFMCPDPLT/action/author_attestation","sign_citation":"https://pith.science/pith/26HPBDCMILMA6GENSVFMCPDPLT/action/citation_signature","submit_replication":"https://pith.science/pith/26HPBDCMILMA6GENSVFMCPDPLT/action/replication_record"}},"created_at":"2026-05-18T01:04:50.632719+00:00","updated_at":"2026-05-18T01:04:50.632719+00:00"}