{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2019:43RNWWYENF6MUHIGNO6MW4CGM4","short_pith_number":"pith:43RNWWYE","schema_version":"1.0","canonical_sha256":"e6e2db5b04697cca1d066bbccb704667181d67af5dc265f40c970d3e8f8ef2ef","source":{"kind":"arxiv","id":"1907.12402","version":2},"attestation_state":"computed","paper":{"title":"Observational evidence for a local underdensity in the Universe and its effect on the measurement of the Hubble Constant","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"Chris A. Collins, Gayoung Chon, Hans Boehringer","submitted_at":"2019-07-29T13:06:13Z","abstract_excerpt":"For precision cosmological studies it is important to know the local properties of the reference point from which we observe the Universe. Particularly for the determination of the Hubble constant with low-redshift distance indicators, the values observed depend on the average matter density within the distance range covered. Here we used the spatial distribution of galaxy clusters to map the matter density distribution. The study is based on our CLASSIX galaxy cluster survey, which is highly complete and well characterised with galaxy clusters detected in X-rays. We find a local underdensity "},"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":"1907.12402","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2019-07-29T13:06:13Z","cross_cats_sorted":[],"title_canon_sha256":"8b779e5ed63ccee5cf274b50b96958785b78886db27a4749bffbd8f40c3ec15a","abstract_canon_sha256":"ceaf50a5618f862580efd310c31573794c89a27ad8ad80238bd4f29cfe94a3ae"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T00:28:11.084257Z","signature_b64":"Q5Bjhs8U8HKjiyN3Pnb/xMLgJTexocnSlDr0DuP26p53To/eoE0dxwTsR2/cJYgzADhnR/E1YKCoM+owQYQKAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"e6e2db5b04697cca1d066bbccb704667181d67af5dc265f40c970d3e8f8ef2ef","last_reissued_at":"2026-07-05T00:28:11.083710Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T00:28:11.083710Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Observational evidence for a local underdensity in the Universe and its effect on the measurement of the Hubble Constant","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"Chris A. Collins, Gayoung Chon, Hans Boehringer","submitted_at":"2019-07-29T13:06:13Z","abstract_excerpt":"For precision cosmological studies it is important to know the local properties of the reference point from which we observe the Universe. Particularly for the determination of the Hubble constant with low-redshift distance indicators, the values observed depend on the average matter density within the distance range covered. Here we used the spatial distribution of galaxy clusters to map the matter density distribution. The study is based on our CLASSIX galaxy cluster survey, which is highly complete and well characterised with galaxy clusters detected in X-rays. We find a local underdensity "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1907.12402","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/1907.12402/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":"1907.12402","created_at":"2026-07-05T00:28:11.083773+00:00"},{"alias_kind":"arxiv_version","alias_value":"1907.12402v2","created_at":"2026-07-05T00:28:11.083773+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1907.12402","created_at":"2026-07-05T00:28:11.083773+00:00"},{"alias_kind":"pith_short_12","alias_value":"43RNWWYENF6M","created_at":"2026-07-05T00:28:11.083773+00:00"},{"alias_kind":"pith_short_16","alias_value":"43RNWWYENF6MUHIG","created_at":"2026-07-05T00:28:11.083773+00:00"},{"alias_kind":"pith_short_8","alias_value":"43RNWWYE","created_at":"2026-07-05T00:28:11.083773+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":1,"internal_anchor_count":1,"sample":[{"citing_arxiv_id":"2607.05502","citing_title":"The tidal features of the classical Milky Way satellites: Expected in MOND but inconsistent with cold dark matter models","ref_index":173,"is_internal_anchor":true}]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/43RNWWYENF6MUHIGNO6MW4CGM4","json":"https://pith.science/pith/43RNWWYENF6MUHIGNO6MW4CGM4.json","graph_json":"https://pith.science/api/pith-number/43RNWWYENF6MUHIGNO6MW4CGM4/graph.json","events_json":"https://pith.science/api/pith-number/43RNWWYENF6MUHIGNO6MW4CGM4/events.json","paper":"https://pith.science/paper/43RNWWYE"},"agent_actions":{"view_html":"https://pith.science/pith/43RNWWYENF6MUHIGNO6MW4CGM4","download_json":"https://pith.science/pith/43RNWWYENF6MUHIGNO6MW4CGM4.json","view_paper":"https://pith.science/paper/43RNWWYE","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1907.12402&json=true","fetch_graph":"https://pith.science/api/pith-number/43RNWWYENF6MUHIGNO6MW4CGM4/graph.json","fetch_events":"https://pith.science/api/pith-number/43RNWWYENF6MUHIGNO6MW4CGM4/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/43RNWWYENF6MUHIGNO6MW4CGM4/action/timestamp_anchor","attest_storage":"https://pith.science/pith/43RNWWYENF6MUHIGNO6MW4CGM4/action/storage_attestation","attest_author":"https://pith.science/pith/43RNWWYENF6MUHIGNO6MW4CGM4/action/author_attestation","sign_citation":"https://pith.science/pith/43RNWWYENF6MUHIGNO6MW4CGM4/action/citation_signature","submit_replication":"https://pith.science/pith/43RNWWYENF6MUHIGNO6MW4CGM4/action/replication_record"}},"created_at":"2026-07-05T00:28:11.083773+00:00","updated_at":"2026-07-05T00:28:11.083773+00:00"}