{"paper":{"title":"Evidence of dynamical dark energy found via the DESI DR2 Lyman$\\alpha$ forest","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"DESI DR2 Lyman-alpha forest measurements favor dynamical dark energy that crosses the phantom divide.","cross_cats":["gr-qc","hep-th"],"primary_cat":"astro-ph.CO","authors_text":"G. Mustafa, Himanshu Chaudhary, Salvatore Capozziello, S. K. J. Pacif","submitted_at":"2025-10-24T19:00:58Z","abstract_excerpt":"We present a comprehensive analysis of the cosmological implications of the Dark Energy Spectroscopic Instrument (DESI) Data Release 2 (DR2) Lyman-$\\alpha$ forest baryon acoustic oscillation (BAO) measurements, combined with DESI DR2 galaxy BAO, Type Ia supernova samples (Pantheon$^+$, DES-Dovekie, and Union3), and the cosmic microwave background CamSpec likelihood. We consider several dark-energy parameterizations, including Chevallier-Polarski-Linder, logarithmic, exponential, Jassal-Bagla-Padmanabhan, Barboza-Alcaniz, and generalized emergent dark energy, as well as the $w$CDM model and non"},"claims":{"count":4,"items":[{"kind":"strongest_claim","text":"All parameterizations favor a dynamical dark-energy scenario with w0 > -1, wa < 0, and w0 + wa < -1, consistent with a Quintom-B behavior. A moderate preference for dynamical dark-energy models is found relative to LambdaCDM, reaching up to ~3.10 sigma for Ly alpha + CMB + galaxy BAO.","source":"verdict.strongest_claim","status":"machine_extracted","claim_id":"C1","attestation":"unclaimed"},{"kind":"weakest_assumption","text":"The chosen dark energy parameterizations (CPL, logarithmic, exponential, JBP, BA, generalized emergent) and the assumption that any deviation from w = -1 must take one of these functional forms; if the true behavior lies outside these families the reported preference could be an artifact of the model space.","source":"verdict.weakest_assumption","status":"machine_extracted","claim_id":"C2","attestation":"unclaimed"},{"kind":"one_line_summary","text":"DESI DR2 Lyman-alpha forest data combined with other probes yields up to 3.1 sigma preference for dynamical dark energy parameterizations over LambdaCDM, with w0 > -1 and wa < 0.","source":"verdict.one_line_summary","status":"machine_extracted","claim_id":"C3","attestation":"unclaimed"},{"kind":"headline","text":"DESI DR2 Lyman-alpha forest measurements favor dynamical dark energy that crosses the phantom divide.","source":"verdict.pith_extraction.headline","status":"machine_extracted","claim_id":"C4","attestation":"unclaimed"}],"snapshot_sha256":"1aa596d5040686c767fb1b78531f055cfe0fa4f5501c119bd7c127bdfd7b9ad5"},"source":{"id":"2510.21976","kind":"arxiv","version":3},"verdict":{"id":"ba80fc82-706c-4173-8059-8cf5e3df022c","model_set":{"reader":"grok-4.3"},"created_at":"2026-05-18T04:05:07.470485Z","strongest_claim":"All parameterizations favor a dynamical dark-energy scenario with w0 > -1, wa < 0, and w0 + wa < -1, consistent with a Quintom-B behavior. A moderate preference for dynamical dark-energy models is found relative to LambdaCDM, reaching up to ~3.10 sigma for Ly alpha + CMB + galaxy BAO.","one_line_summary":"DESI DR2 Lyman-alpha forest data combined with other probes yields up to 3.1 sigma preference for dynamical dark energy parameterizations over LambdaCDM, with w0 > -1 and wa < 0.","pipeline_version":"pith-pipeline@v0.9.0","weakest_assumption":"The chosen dark energy parameterizations (CPL, logarithmic, exponential, JBP, BA, generalized emergent) and the assumption that any deviation from w = -1 must take one of these functional forms; if the true behavior lies outside these families the reported preference could be an artifact of the model space.","pith_extraction_headline":"DESI DR2 Lyman-alpha forest measurements favor dynamical dark energy that crosses the phantom divide."},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2510.21976/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":2,"snapshot_sha256":"2b086fd9603d9f91c826d0969e44071070e48b48fe28b21e0903cca6db4695e2"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}