{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2011:IUHX25XIG6C7AUYCMDFG3GS5WY","short_pith_number":"pith:IUHX25XI","schema_version":"1.0","canonical_sha256":"450f7d76e83785f0530260ca6d9a5db6135a943a36bb299a991d005ce093ed1a","source":{"kind":"arxiv","id":"1103.1953","version":1},"attestation_state":"computed","paper":{"title":"Modelling Time-varying Dark Energy with Constraints from Latest Observations","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["gr-qc"],"primary_cat":"astro-ph.CO","authors_text":"Qing-Jun Zhang, Yue-Liang Wu","submitted_at":"2011-03-10T07:24:53Z","abstract_excerpt":"We introduce a set of two-parameter models for the dark energy equation of state (EOS) $w(z)$ to investigate time-varying dark energy. The models are classified into two types according to their boundary behaviors at the redshift $z=(0,\\infty)$ and their local extremum properties. A joint analysis based on four observations (SNe + BAO + CMB + $H_0$) is carried out to constrain all the models. It is shown that all models get almost the same $\\chi^2_{min}\\simeq 469$ and the cosmological parameters $(\\Omega_M, h, \\Omega_bh^2)$ with the best-fit results $(0.28, 0.70, 2.24)$, although the constrain"},"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":"1103.1953","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2011-03-10T07:24:53Z","cross_cats_sorted":["gr-qc"],"title_canon_sha256":"79fb8afeb512eeab6ec22911f7fffcfa51957a759bb482a4a4e22152e1e9620a","abstract_canon_sha256":"103132624ccb49031a9352f8c7b4138e845fb27fbaf6f87c8c48068749338811"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:02:55.338018Z","signature_b64":"DZb2wUUaMGBA0SnTRe+1K7nFw19kdgdQTdIr3EiN0Lk42Hsv8PU4w2pEuDZ00sbNxaum5awbem7ueCsF1wnfCg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"450f7d76e83785f0530260ca6d9a5db6135a943a36bb299a991d005ce093ed1a","last_reissued_at":"2026-05-18T02:02:55.337340Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:02:55.337340Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Modelling Time-varying Dark Energy with Constraints from Latest Observations","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["gr-qc"],"primary_cat":"astro-ph.CO","authors_text":"Qing-Jun Zhang, Yue-Liang Wu","submitted_at":"2011-03-10T07:24:53Z","abstract_excerpt":"We introduce a set of two-parameter models for the dark energy equation of state (EOS) $w(z)$ to investigate time-varying dark energy. The models are classified into two types according to their boundary behaviors at the redshift $z=(0,\\infty)$ and their local extremum properties. A joint analysis based on four observations (SNe + BAO + CMB + $H_0$) is carried out to constrain all the models. It is shown that all models get almost the same $\\chi^2_{min}\\simeq 469$ and the cosmological parameters $(\\Omega_M, h, \\Omega_bh^2)$ with the best-fit results $(0.28, 0.70, 2.24)$, although the constrain"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1103.1953","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":"1103.1953","created_at":"2026-05-18T02:02:55.337448+00:00"},{"alias_kind":"arxiv_version","alias_value":"1103.1953v1","created_at":"2026-05-18T02:02:55.337448+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1103.1953","created_at":"2026-05-18T02:02:55.337448+00:00"},{"alias_kind":"pith_short_12","alias_value":"IUHX25XIG6C7","created_at":"2026-05-18T12:26:32.869790+00:00"},{"alias_kind":"pith_short_16","alias_value":"IUHX25XIG6C7AUYC","created_at":"2026-05-18T12:26:32.869790+00:00"},{"alias_kind":"pith_short_8","alias_value":"IUHX25XI","created_at":"2026-05-18T12:26:32.869790+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/IUHX25XIG6C7AUYCMDFG3GS5WY","json":"https://pith.science/pith/IUHX25XIG6C7AUYCMDFG3GS5WY.json","graph_json":"https://pith.science/api/pith-number/IUHX25XIG6C7AUYCMDFG3GS5WY/graph.json","events_json":"https://pith.science/api/pith-number/IUHX25XIG6C7AUYCMDFG3GS5WY/events.json","paper":"https://pith.science/paper/IUHX25XI"},"agent_actions":{"view_html":"https://pith.science/pith/IUHX25XIG6C7AUYCMDFG3GS5WY","download_json":"https://pith.science/pith/IUHX25XIG6C7AUYCMDFG3GS5WY.json","view_paper":"https://pith.science/paper/IUHX25XI","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1103.1953&json=true","fetch_graph":"https://pith.science/api/pith-number/IUHX25XIG6C7AUYCMDFG3GS5WY/graph.json","fetch_events":"https://pith.science/api/pith-number/IUHX25XIG6C7AUYCMDFG3GS5WY/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/IUHX25XIG6C7AUYCMDFG3GS5WY/action/timestamp_anchor","attest_storage":"https://pith.science/pith/IUHX25XIG6C7AUYCMDFG3GS5WY/action/storage_attestation","attest_author":"https://pith.science/pith/IUHX25XIG6C7AUYCMDFG3GS5WY/action/author_attestation","sign_citation":"https://pith.science/pith/IUHX25XIG6C7AUYCMDFG3GS5WY/action/citation_signature","submit_replication":"https://pith.science/pith/IUHX25XIG6C7AUYCMDFG3GS5WY/action/replication_record"}},"created_at":"2026-05-18T02:02:55.337448+00:00","updated_at":"2026-05-18T02:02:55.337448+00:00"}