articleThe Astrophysical Journal LettersJun 19, 2025GOLD OA

Cosmology in Extended Parameter Space with DESI Data Release 2 Baryon Acoustic Oscillations: A 2 σ + Detection of Nonzero Neutrino Masses with an Update on Dynamical Dark Energy and Lensing Anomaly

SRShouvik Roy Choudhury
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Abstract

Abstract We obtain constraints in a 12 parameter cosmological model using the recent Dark Energy Spectroscopic Instrument Data Release (DR) 2 Baryon Acoustic Oscillations (BAO) data, combined with cosmic microwave background (CMB) power spectra (Planck Public Release, PR, 4) and lensing (Planck PR4 + Atacama Cosmology Telescope DR 6) data, uncalibrated Type Ia supernovae (SNe) data from Pantheon+ and Dark Energy Survey (DES) Year 5 (DESY5) samples, and Weak Lensing (WL; DES Year 1) data. The cosmological model consists of six Λ cold dark matter parameters and additionally, the dynamical dark energy parameters ( w 0 , w a ), the sum of neutrino masses (∑ m ν ), the effective number of non-photon radiation…

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Topics & keywords

Topics
Keywords
  • Physics
  • Dark energy
  • Cosmic microwave background
  • Planck
  • Cosmology
  • Astrophysics
  • Optics
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