{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2019:SW4E6GOBQ3XQ476M2MFK7PV53M","short_pith_number":"pith:SW4E6GOB","schema_version":"1.0","canonical_sha256":"95b84f19c186ef0e7fccd30aafbebddb317fa081ad904f42475f6092b89a3e40","source":{"kind":"arxiv","id":"1901.05705","version":1},"attestation_state":"computed","paper":{"title":"A Model-Independent Measurement of the Spatial Curvature using Cosmic Chronometers and the HII Hubble Diagram","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"Fulvio Melia, Jing Zheng, Tong-Jie Zhang","submitted_at":"2019-01-17T09:58:32Z","abstract_excerpt":"We propose a model-independent way to determine the cosmic curvature using the Hubble parameter $H(z)$ measured with cosmic chronometers and the comoving distance $D(z)$ inferred from HII galaxies. We employ Gaussian processes to smooth the measure of distance and match it to $30$ values of $H(z)$. The curvature parameter $\\Omega_k$ may be obtained individually for each such pair. The weighted average for the complete sample is $\\Omega_k=-0.0013\\pm0.0004$, suggesting a bias towards negative values. The accuracy of the curvature measurement improves with increased redshift, however, given possi"},"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":"1901.05705","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2019-01-17T09:58:32Z","cross_cats_sorted":[],"title_canon_sha256":"01c26a021e4d2cb590b6996dc5bb7684671adc45cbbfaa684645d4d1bc3035a0","abstract_canon_sha256":"895642e4afbd3335bfab6c0723aca02847f9096ca302cf7aadf3df6559f43d6e"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:56:06.370703Z","signature_b64":"Vy/OzL8cExxAl/AXUg9IXZQWxetTT3LLJ3Fl+saydVu52rsy/yWEGJpT1dG0/sl2vxAzr1sAzGz5JRgNL5nhCA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"95b84f19c186ef0e7fccd30aafbebddb317fa081ad904f42475f6092b89a3e40","last_reissued_at":"2026-05-17T23:56:06.370166Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:56:06.370166Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"A Model-Independent Measurement of the Spatial Curvature using Cosmic Chronometers and the HII Hubble Diagram","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"Fulvio Melia, Jing Zheng, Tong-Jie Zhang","submitted_at":"2019-01-17T09:58:32Z","abstract_excerpt":"We propose a model-independent way to determine the cosmic curvature using the Hubble parameter $H(z)$ measured with cosmic chronometers and the comoving distance $D(z)$ inferred from HII galaxies. We employ Gaussian processes to smooth the measure of distance and match it to $30$ values of $H(z)$. The curvature parameter $\\Omega_k$ may be obtained individually for each such pair. The weighted average for the complete sample is $\\Omega_k=-0.0013\\pm0.0004$, suggesting a bias towards negative values. The accuracy of the curvature measurement improves with increased redshift, however, given possi"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1901.05705","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":""},"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":"1901.05705","created_at":"2026-05-17T23:56:06.370232+00:00"},{"alias_kind":"arxiv_version","alias_value":"1901.05705v1","created_at":"2026-05-17T23:56:06.370232+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1901.05705","created_at":"2026-05-17T23:56:06.370232+00:00"},{"alias_kind":"pith_short_12","alias_value":"SW4E6GOBQ3XQ","created_at":"2026-05-18T12:33:27.125529+00:00"},{"alias_kind":"pith_short_16","alias_value":"SW4E6GOBQ3XQ476M","created_at":"2026-05-18T12:33:27.125529+00:00"},{"alias_kind":"pith_short_8","alias_value":"SW4E6GOB","created_at":"2026-05-18T12:33:27.125529+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/SW4E6GOBQ3XQ476M2MFK7PV53M","json":"https://pith.science/pith/SW4E6GOBQ3XQ476M2MFK7PV53M.json","graph_json":"https://pith.science/api/pith-number/SW4E6GOBQ3XQ476M2MFK7PV53M/graph.json","events_json":"https://pith.science/api/pith-number/SW4E6GOBQ3XQ476M2MFK7PV53M/events.json","paper":"https://pith.science/paper/SW4E6GOB"},"agent_actions":{"view_html":"https://pith.science/pith/SW4E6GOBQ3XQ476M2MFK7PV53M","download_json":"https://pith.science/pith/SW4E6GOBQ3XQ476M2MFK7PV53M.json","view_paper":"https://pith.science/paper/SW4E6GOB","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1901.05705&json=true","fetch_graph":"https://pith.science/api/pith-number/SW4E6GOBQ3XQ476M2MFK7PV53M/graph.json","fetch_events":"https://pith.science/api/pith-number/SW4E6GOBQ3XQ476M2MFK7PV53M/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/SW4E6GOBQ3XQ476M2MFK7PV53M/action/timestamp_anchor","attest_storage":"https://pith.science/pith/SW4E6GOBQ3XQ476M2MFK7PV53M/action/storage_attestation","attest_author":"https://pith.science/pith/SW4E6GOBQ3XQ476M2MFK7PV53M/action/author_attestation","sign_citation":"https://pith.science/pith/SW4E6GOBQ3XQ476M2MFK7PV53M/action/citation_signature","submit_replication":"https://pith.science/pith/SW4E6GOBQ3XQ476M2MFK7PV53M/action/replication_record"}},"created_at":"2026-05-17T23:56:06.370232+00:00","updated_at":"2026-05-17T23:56:06.370232+00:00"}