{"work":{"id":"47ffb21f-ae8d-4dd5-b0ca-71c52613f5e1","openalex_id":null,"doi":null,"arxiv_id":"2507.16589","raw_key":null,"title":"Cosmological preference for a positive neutrino mass at 2.7$\\sigma$: A joint analysis of DESI DR2, DESY5, and DESY1 data","authors":null,"authors_text":"G","year":2025,"venue":"astro-ph.CO","abstract":"Neutrinos and dark energy (DE) have entered a new era of investigation, as the latest DESI baryon acoustic oscillation measurements tighten the constraints on the neutrino mass and suggest that DE may be dynamical rather than a cosmological constant. In this work, we obtain a high-confidence measurement of the neutrino mass within a dynamical DE framework. A joint analysis of DESI DR2, cosmic microwave background, DESY5 supernova, and DESY1 weak lensing data yields a total neutrino mass of $\\sum m_\\nu = 0.098^{+0.016}_{-0.037}\\,\\mathrm{eV}$, indicating a measurement for a non-zero, positive neutrino mass at the $2.7\\sigma$ level within the $w_0w_a$CDM framework. This high-confidence measurement is driven mainly by these factors: (i) the DESI's preference for a dynamical DE with its equation of state evolving from $w< -1$ at early times to $w> -1$ at late times, thus leading to a larger neutrino mass; (ii) treating $N_{\\mathrm{eff}}$ as a free parameter together with the inclusion of weak lensing data, which likewise allows for an increased neutrino mass. In the future, even higher-confidence measurements of neutrino mass are expected with stronger preferences for dynamical DE in light of more complete DESI data releases.","external_url":"https://arxiv.org/abs/2507.16589","cited_by_count":null,"metadata_source":"pith","metadata_fetched_at":"2026-07-04T08:19:44.471563+00:00","pith_arxiv_id":"2507.16589","created_at":"2026-05-11T21:26:15.930461+00:00","updated_at":"2026-07-04T08:19:44.471563+00:00","title_quality_ok":true,"display_title":"Du, T.-N","render_title":"Du, T.-N"},"hub":{"state":{"work_id":"47ffb21f-ae8d-4dd5-b0ca-71c52613f5e1","tier":"hub","tier_reason":"10+ Pith inbound or 1,000+ external citations","pith_inbound_count":16,"external_cited_by_count":null,"distinct_field_count":1,"first_pith_cited_at":"2025-10-24T14:43:09+00:00","last_pith_cited_at":"2026-06-26T15:10:43+00:00","author_build_status":"not_needed","summary_status":"needed","contexts_status":"needed","graph_status":"needed","ask_index_status":"not_needed","reader_status":"not_needed","recognition_status":"not_needed","updated_at":"2026-08-18T07:50:08.882937+00:00","tier_text":"hub"},"tier":"hub","role_counts":[{"context_role":"background","n":10},{"context_role":"dataset","n":1}],"polarity_counts":[{"context_polarity":"background","n":8},{"context_polarity":"support","n":1},{"context_polarity":"unclear","n":1},{"context_polarity":"use_dataset","n":1}],"runs":{},"summary":{},"graph":{},"authors":[]}}