{"paper":{"title":"New $H(z)$ measurement at Redshift = 0.12 with DESI Data Release 1","license":"http://creativecommons.org/licenses/by/4.0/","headline":"New measurement of the Hubble parameter at redshift 0.12 from stellar ages of DESI galaxies gives 71.33 km/s/Mpc.","cross_cats":["astro-ph.GA"],"primary_cat":"astro-ph.CO","authors_text":"Lei Lei, Yi-Zhong Fan, Ze-fan Wang","submitted_at":"2026-01-12T09:17:48Z","abstract_excerpt":"The Hubble parameter ($H(z)$) is a function of the redshift and a reliable measurement is very important to understand the expansion history of the Universe. In this work, we perform full-spectrum fitting using BAGPIPES on more than four thousand massive, passively evolving galaxies released by the DESI collaboration to estimate their cosmological-independent stellar ages and star-formation histories, and derive a new measurement of $H(z=0.12)=71.33 \\pm 4.20~{\\rm km~s^{-1}~Mpc^{-1}}$, which is well consistent with those derived in other ways."},"claims":{"count":4,"items":[{"kind":"strongest_claim","text":"we derive a new measurement of H(z=0.12)=71.33 ± 4.20 km s^{-1} Mpc^{-1}, which is well consistent with those derived in other ways.","source":"verdict.strongest_claim","status":"machine_extracted","claim_id":"C1","attestation":"unclaimed"},{"kind":"weakest_assumption","text":"The full-spectrum fitting with BAGPIPES yields accurate, cosmology-independent stellar ages for the selected massive passively evolving galaxies that can be directly converted into an H(z) measurement.","source":"verdict.weakest_assumption","status":"machine_extracted","claim_id":"C2","attestation":"unclaimed"},{"kind":"one_line_summary","text":"New measurement of the Hubble parameter H(z=0.12) = 71.33 ± 4.20 km s^{-1} Mpc^{-1} obtained from cosmology-independent stellar ages of passive galaxies in DESI Data Release 1.","source":"verdict.one_line_summary","status":"machine_extracted","claim_id":"C3","attestation":"unclaimed"},{"kind":"headline","text":"New measurement of the Hubble parameter at redshift 0.12 from stellar ages of DESI galaxies gives 71.33 km/s/Mpc.","source":"verdict.pith_extraction.headline","status":"machine_extracted","claim_id":"C4","attestation":"unclaimed"}],"snapshot_sha256":"6fa72b52468f4aea3d5e14834d2e01f5db39824b79e1cf646a87ef7d31db99bb"},"source":{"id":"2601.07345","kind":"arxiv","version":2},"verdict":{"id":"95061299-7712-4528-911e-d6e801240032","model_set":{"reader":"grok-4.3"},"created_at":"2026-05-16T15:29:22.164866Z","strongest_claim":"we derive a new measurement of H(z=0.12)=71.33 ± 4.20 km s^{-1} Mpc^{-1}, which is well consistent with those derived in other ways.","one_line_summary":"New measurement of the Hubble parameter H(z=0.12) = 71.33 ± 4.20 km s^{-1} Mpc^{-1} obtained from cosmology-independent stellar ages of passive galaxies in DESI Data Release 1.","pipeline_version":"pith-pipeline@v0.9.0","weakest_assumption":"The full-spectrum fitting with BAGPIPES yields accurate, cosmology-independent stellar ages for the selected massive passively evolving galaxies that can be directly converted into an H(z) measurement.","pith_extraction_headline":"New measurement of the Hubble parameter at redshift 0.12 from stellar ages of DESI galaxies gives 71.33 km/s/Mpc."},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2601.07345/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":80,"sample":[{"doi":"10.1016/j.jheap.2022.04.002","year":2022,"title":"Cosmology Intertwined: A Review of the Particle Physics, Astrophysics, and Cosmology Associated with the Cosmological Tensions and Anomalies","work_id":"d2c29043-63d3-4f74-946c-760d7348fd04","ref_index":1,"cited_arxiv_id":"2203.06142","is_internal_anchor":true},{"doi":"10.48550/arxiv.2405.12518","year":2024,"title":"2022a, A&A, 668, A142 Acebron, A., Grillo, C., Bergamini, P., et al","work_id":"74858cba-6d78-434d-aa97-0024bee05262","ref_index":2,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"10.3847/1538-4357/ab07af","year":2019,"title":"B., & Ellis, R","work_id":"34a91f7b-bd43-40c1-9465-2d578cbf92f4","ref_index":3,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"10.1086/376983","year":2003,"title":"Probing dark energy using baryonic oscillations in the galaxy power spectrum as a cosmological ruler","work_id":"4ef2e2a0-34b5-4af2-ae19-a22d39b02cef","ref_index":4,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"10.3847/2041-8213/ac3fb2","year":2041,"title":"2022a, ApJL, 928, L4, doi: 10.3847/2041-8213/ac3fb2","work_id":"43808b55-28ec-4b2a-90e0-011ee9be8224","ref_index":5,"cited_arxiv_id":"","is_internal_anchor":false}],"resolved_work":80,"snapshot_sha256":"8a7dc447059b04cdc8b0c9aba4a1a4f9afd5a71c32cf3064a75a5c0236d89e0a","internal_anchors":16},"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"}