Physics Letters B最新文献_第4页

Cosmological constraints on non-cold dark matter from DESI DR2 measurements 来自DESI DR2测量的非冷暗物质的宇宙学约束

IF 5 2区物理与天体物理

Physics Letters B Pub Date : 2026-08-15 DOI: 10.1016/j.physletb.2026.140858

Utkarsh Kumar, Abhijith Ajith, Amresh Verma

{"title":"Cosmological constraints on non-cold dark matter from DESI DR2 measurements","authors":"Utkarsh Kumar, Abhijith Ajith, Amresh Verma","doi":"10.1016/j.physletb.2026.140858","DOIUrl":"10.1016/j.physletb.2026.140858","url":null,"abstract":"<div><div>We investigate potential deviations from cold dark matter (CDM) using the latest Baryon Acoustic Oscillations (BAO) measurements from the Dark Energy Spectroscopic Instrument (DESI). Analyzing DESI data alone constrains the dark matter equation of state parameter <math><mrow><msub><mi>w</mi><mtext>dm</mtext></msub><mo>=</mo><mo>−</mo><mn>0</mn><mo>.</mo><msubsup><mn>042</mn><mrow><mo>−</mo><mn>0.024</mn></mrow><mrow><mo>+</mo><mn>0.047</mn></mrow></msubsup></mrow></math>, revealing a mild preference for non-cold dark matter. This preference strengthens significantly in combined analyses, but reveals a striking tension in the inferred wdm values from observations of different nature. The DESI+DESY5 combination yields <math><mrow><msub><mi>w</mi><mtext>dm</mtext></msub><mo>=</mo><mo>−</mo><mn>0.084</mn><mo>±</mo><mn>0.035</mn></mrow></math>, excluding CDM (<math><mrow><msub><mi>w</mi><mtext>dm</mtext></msub><mo>=</mo><mn>0</mn></mrow></math>) at 2.4σ significance. In contrast, Planck+DESI gives <math><mrow><msub><mi>w</mi><mtext>dm</mtext></msub><mo>=</mo><mn>0.00077</mn><mo>±</mo><mn>0.00038</mn></mrow></math>, differing from concordance model at 2σ significance. The non-vanishing wdm preference is particularly driven by low-redshift BAO measurements (z < 1.1), while higher redshift data remain consistent with ΛCDM. The preference for non-cold dark matter is more pronounced in DESI compared to the previous BAO surveys. All dataset combinations show significant improvement over the ΛCDM paradigm, providing preference for non-cold dark matter scenario except DESI+DESY3+DES-DOV case.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"880 ","pages":"Article 140858"},"PeriodicalIF":5.0,"publicationDate":"2026-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148755261","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}