{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2024:H2HIMYRZIWLWGLRGYP2Q6LHVAW","short_pith_number":"pith:H2HIMYRZ","schema_version":"1.0","canonical_sha256":"3e8e8662394597632e26c3f50f2cf5058462c4726920025ec6af1342fe62475a","source":{"kind":"arxiv","id":"2404.03840","version":1},"attestation_state":"computed","paper":{"title":"FarView: An In-Situ Manufactured Lunar Far Side Radio Array Concept for 21-cm Dark Ages Cosmology","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["astro-ph.CO"],"primary_cat":"astro-ph.IM","authors_text":"Alex Hegedus, Alex Ignatiev, Gregg Hallinan, Jack O. Burns, Jonathan Pober, Judd Bowman, Nivedita Mahesh, Ronald S. Polidan, Tzu-Ching Chang, Yuhong Ning","submitted_at":"2024-04-05T00:09:53Z","abstract_excerpt":"FarView is an early-stage concept for a large, low-frequency radio observatory, manufactured in-situ on the lunar far side using metals extracted from the lunar regolith. It consists of 100,000 dipole antennas in compact subarrays distributed over a large area but with empty space between subarrays in a core-halo structure. FarView covers a total area of ~200 km2, has a dense core within the inner ~36 km2, and a ~power-law falloff of antenna density out to ~14 km from the center. With this design, it is relatively easy to identify multiple viable build sites on the lunar far side. The science "},"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":"2404.03840","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.IM","submitted_at":"2024-04-05T00:09:53Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"1c6cec90bb3bbac37214b8c0dafe5483dea3ea27357f14d857174c96365f8f93","abstract_canon_sha256":"04f02a1632af9a8b26622ddcb90de7570a6bc1ded814dad91cf64e83a6c5acb3"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T08:04:42.067350Z","signature_b64":"i2hmMgEQ2uFKPCkfmte2QVVM0lo+t9/X0wJovTVbYnsc4qwo9UnmYkpDCDk298bJJT8bPAgOE58uSWGHGdxzCQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"3e8e8662394597632e26c3f50f2cf5058462c4726920025ec6af1342fe62475a","last_reissued_at":"2026-07-05T08:04:42.066844Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T08:04:42.066844Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"FarView: An In-Situ Manufactured Lunar Far Side Radio Array Concept for 21-cm Dark Ages Cosmology","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["astro-ph.CO"],"primary_cat":"astro-ph.IM","authors_text":"Alex Hegedus, Alex Ignatiev, Gregg Hallinan, Jack O. Burns, Jonathan Pober, Judd Bowman, Nivedita Mahesh, Ronald S. Polidan, Tzu-Ching Chang, Yuhong Ning","submitted_at":"2024-04-05T00:09:53Z","abstract_excerpt":"FarView is an early-stage concept for a large, low-frequency radio observatory, manufactured in-situ on the lunar far side using metals extracted from the lunar regolith. It consists of 100,000 dipole antennas in compact subarrays distributed over a large area but with empty space between subarrays in a core-halo structure. FarView covers a total area of ~200 km2, has a dense core within the inner ~36 km2, and a ~power-law falloff of antenna density out to ~14 km from the center. With this design, it is relatively easy to identify multiple viable build sites on the lunar far side. The science "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2404.03840","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2404.03840/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2404.03840","created_at":"2026-07-05T08:04:42.066896+00:00"},{"alias_kind":"arxiv_version","alias_value":"2404.03840v1","created_at":"2026-07-05T08:04:42.066896+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2404.03840","created_at":"2026-07-05T08:04:42.066896+00:00"},{"alias_kind":"pith_short_12","alias_value":"H2HIMYRZIWLW","created_at":"2026-07-05T08:04:42.066896+00:00"},{"alias_kind":"pith_short_16","alias_value":"H2HIMYRZIWLWGLRG","created_at":"2026-07-05T08:04:42.066896+00:00"},{"alias_kind":"pith_short_8","alias_value":"H2HIMYRZ","created_at":"2026-07-05T08:04:42.066896+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":4,"internal_anchor_count":0,"sample":[{"citing_arxiv_id":"2606.23314","citing_title":"Wedge-avoidance Fisher Forecasts for Primordial Non-Gaussianity from Dark-Ages 21-cm Power Spectrum and Bispectrum","ref_index":23,"is_internal_anchor":false},{"citing_arxiv_id":"2605.29276","citing_title":"A Designer's Guide to Lunar Far-Side Interferometer Array: Power Spectrum Measurement and Cosmological Constraints from the Dark Ages","ref_index":34,"is_internal_anchor":false},{"citing_arxiv_id":"2511.14845","citing_title":"Low-frequency radio telescopes sensitivity to light dark matter","ref_index":54,"is_internal_anchor":false},{"citing_arxiv_id":"2603.18884","citing_title":"Primordial black holes and the velocity acoustic oscillations features in 21 cm signals from the cosmic Dark Ages","ref_index":63,"is_internal_anchor":false}]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/H2HIMYRZIWLWGLRGYP2Q6LHVAW","json":"https://pith.science/pith/H2HIMYRZIWLWGLRGYP2Q6LHVAW.json","graph_json":"https://pith.science/api/pith-number/H2HIMYRZIWLWGLRGYP2Q6LHVAW/graph.json","events_json":"https://pith.science/api/pith-number/H2HIMYRZIWLWGLRGYP2Q6LHVAW/events.json","paper":"https://pith.science/paper/H2HIMYRZ"},"agent_actions":{"view_html":"https://pith.science/pith/H2HIMYRZIWLWGLRGYP2Q6LHVAW","download_json":"https://pith.science/pith/H2HIMYRZIWLWGLRGYP2Q6LHVAW.json","view_paper":"https://pith.science/paper/H2HIMYRZ","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=2404.03840&json=true","fetch_graph":"https://pith.science/api/pith-number/H2HIMYRZIWLWGLRGYP2Q6LHVAW/graph.json","fetch_events":"https://pith.science/api/pith-number/H2HIMYRZIWLWGLRGYP2Q6LHVAW/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/H2HIMYRZIWLWGLRGYP2Q6LHVAW/action/timestamp_anchor","attest_storage":"https://pith.science/pith/H2HIMYRZIWLWGLRGYP2Q6LHVAW/action/storage_attestation","attest_author":"https://pith.science/pith/H2HIMYRZIWLWGLRGYP2Q6LHVAW/action/author_attestation","sign_citation":"https://pith.science/pith/H2HIMYRZIWLWGLRGYP2Q6LHVAW/action/citation_signature","submit_replication":"https://pith.science/pith/H2HIMYRZIWLWGLRGYP2Q6LHVAW/action/replication_record"}},"created_at":"2026-07-05T08:04:42.066896+00:00","updated_at":"2026-07-05T08:04:42.066896+00:00"}