{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2015:LIX6BMY25V5WQOI3JASFXDHYXG","short_pith_number":"pith:LIX6BMY2","schema_version":"1.0","canonical_sha256":"5a2fe0b31aed7b68391b48245b8cf8b99e3e9fe8f509ba9de4c298057797c5fb","source":{"kind":"arxiv","id":"1512.05248","version":2},"attestation_state":"computed","paper":{"title":"A practical theorem on using interferometry to measure the global 21-cm signal","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO"],"primary_cat":"astro-ph.IM","authors_text":"Christopher M. Hirata, Olivier Dor\\'e, Tejaswi Venumadhav, Tzu-Ching Chang","submitted_at":"2015-12-16T16:59:17Z","abstract_excerpt":"The sky-averaged, or global, background of redshifted $21$ cm radiation is expected to be a rich source of information on cosmological reheating and reionizaton. However, measuring the signal is technically challenging: one must extract a small, frequency-dependent signal from under much brighter spectrally smooth foregrounds. Traditional approaches to study the global signal have used single antennas, which require one to calibrate out the frequency-dependent structure in the overall system gain (due to internal reflections, for example) as well as remove the noise bias from auto-correlating "},"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":"1512.05248","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2015-12-16T16:59:17Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"cf660cd42c01791a92535048cad428ec23bb67ecfb3628738caeeb9daf30570c","abstract_canon_sha256":"8c78295f9322e211fe8e4a33dcc8a4b60a305a1bdea17ecba038ff32bf690e2f"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:10:07.841499Z","signature_b64":"hBm0AvLQgeRc1mv5jPz4hysoVSJAYqxytokaYfHTXIyw7wz5Rbz9T8n1SXxr5BjgR5snkhfnObNIE9bjOGmFDQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"5a2fe0b31aed7b68391b48245b8cf8b99e3e9fe8f509ba9de4c298057797c5fb","last_reissued_at":"2026-05-18T01:10:07.840723Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:10:07.840723Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"A practical theorem on using interferometry to measure the global 21-cm signal","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO"],"primary_cat":"astro-ph.IM","authors_text":"Christopher M. Hirata, Olivier Dor\\'e, Tejaswi Venumadhav, Tzu-Ching Chang","submitted_at":"2015-12-16T16:59:17Z","abstract_excerpt":"The sky-averaged, or global, background of redshifted $21$ cm radiation is expected to be a rich source of information on cosmological reheating and reionizaton. However, measuring the signal is technically challenging: one must extract a small, frequency-dependent signal from under much brighter spectrally smooth foregrounds. Traditional approaches to study the global signal have used single antennas, which require one to calibrate out the frequency-dependent structure in the overall system gain (due to internal reflections, for example) as well as remove the noise bias from auto-correlating "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1512.05248","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":"1512.05248","created_at":"2026-05-18T01:10:07.840850+00:00"},{"alias_kind":"arxiv_version","alias_value":"1512.05248v2","created_at":"2026-05-18T01:10:07.840850+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1512.05248","created_at":"2026-05-18T01:10:07.840850+00:00"},{"alias_kind":"pith_short_12","alias_value":"LIX6BMY25V5W","created_at":"2026-05-18T12:29:29.992203+00:00"},{"alias_kind":"pith_short_16","alias_value":"LIX6BMY25V5WQOI3","created_at":"2026-05-18T12:29:29.992203+00:00"},{"alias_kind":"pith_short_8","alias_value":"LIX6BMY2","created_at":"2026-05-18T12:29:29.992203+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/LIX6BMY25V5WQOI3JASFXDHYXG","json":"https://pith.science/pith/LIX6BMY25V5WQOI3JASFXDHYXG.json","graph_json":"https://pith.science/api/pith-number/LIX6BMY25V5WQOI3JASFXDHYXG/graph.json","events_json":"https://pith.science/api/pith-number/LIX6BMY25V5WQOI3JASFXDHYXG/events.json","paper":"https://pith.science/paper/LIX6BMY2"},"agent_actions":{"view_html":"https://pith.science/pith/LIX6BMY25V5WQOI3JASFXDHYXG","download_json":"https://pith.science/pith/LIX6BMY25V5WQOI3JASFXDHYXG.json","view_paper":"https://pith.science/paper/LIX6BMY2","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1512.05248&json=true","fetch_graph":"https://pith.science/api/pith-number/LIX6BMY25V5WQOI3JASFXDHYXG/graph.json","fetch_events":"https://pith.science/api/pith-number/LIX6BMY25V5WQOI3JASFXDHYXG/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/LIX6BMY25V5WQOI3JASFXDHYXG/action/timestamp_anchor","attest_storage":"https://pith.science/pith/LIX6BMY25V5WQOI3JASFXDHYXG/action/storage_attestation","attest_author":"https://pith.science/pith/LIX6BMY25V5WQOI3JASFXDHYXG/action/author_attestation","sign_citation":"https://pith.science/pith/LIX6BMY25V5WQOI3JASFXDHYXG/action/citation_signature","submit_replication":"https://pith.science/pith/LIX6BMY25V5WQOI3JASFXDHYXG/action/replication_record"}},"created_at":"2026-05-18T01:10:07.840850+00:00","updated_at":"2026-05-18T01:10:07.840850+00:00"}