Constraints on Spatial Curvature and Dark Energy Dynamics in the $w$CDM Model from DESI DR1 and DR2

Abstract

In this study, we investigate the $w$CDM dynamical dark energy model with spatial curvature utilizing the recently released DESI Collaboration data (DR1 and DR2) in conjunction with other observational probes such as BBN, Observational Hubble Data (OHD), and Pantheon Plus (PP). Our investigation attempts to discover which DESI dataset gives a better match to the $w$CDM framework and assess the impact of spatial curvature on cosmological constraints. We find that the cosmic curvature parameter, ${\Omega }_k$, disfavors the cosmological constant for the DR2+BBN and DR2+BBN+OHD data combinations. However, the deviation from the cosmological constant remains below the $1\sigma$ level, indicating a mild preference for a open universe. In contrast, when using the DR1 based combinations namely DR1+BBN and DR1+BBN+OHD-the deviation from the cosmological constant increases to approximately $1.2\sigma$, suggesting a slightly stronger indication of a open geometry. Also, the best-fit values of the Hubble constant ($H_0$) obtained from the DR1+BBN+OHD+PP and DR2+BBN+OHD+PP combinations within the dynamical dark energy model are consistent with the results reported by the Planck Collaboration. Our findings provide constraints on the dark energy EoS parameter $w_0$, reveal a mild but notable deviation from the vacuum energy ($w=-1$) scenario at a significance level $1.8\sigma$ from DR2+BBN+OHD+PP and $0.5\sigma$ from DR1+BBN+OHD+PP, both favoring the quintessence region of dark energy. Furthermore, the key physical distance measures $D_H$, $D_V$, and $D_M$ show better consistency with our model when analyzed with the DR2 data.

13 pages, 7 figures, 1 table, Published paper

References in corpus (34)

• Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant
• Measurements of Omega and Lambda from 42 High-Redshift Supernovae
• A Comprehensive Measurement of the Local Value of the Hubble Constant with 1 km/s/Mpc Uncertainty from the Hubble Space Telescope and the SH0ES Team
• The Completed SDSS-IV extended Baryon Oscillation Spectroscopic Survey: Cosmological Implications from two Decades of Spectroscopic Surveys at the Apache Point observatory
• Constraints on the redshift dependence of the dark energy potential
• Dark Energy Survey Year 3 Results: Cosmological Constraints from Galaxy Clustering and Weak Lensing
• Raising the bar: new constraints on the Hubble parameter with cosmic chronometers at z$\sim$2
• Constraining Cosmological Parameters Based on Relative Galaxy Ages
• The Pantheon+ Analysis: The Full Dataset and Light-Curve Release
• Planck evidence for a closed Universe and a possible crisis for cosmology
• Age-dating Luminous Red Galaxies observed with the Southern African Large Telescope
• Curvature tension: evidence for a closed universe
• The Megamaser Cosmology Project. XIII. Combined Hubble constant constraints
• The CosmoVerse White Paper: Addressing observational tensions in cosmology with systematics and fundamental physics
• DESI 2024 IV: Baryon Acoustic Oscillations from the Lyman Alpha Forest
• Toward a Better Understanding of Cosmic Chronometers: A new measurement of H(z) at z~0.7
• Cosmic Microwave Weak lensing data as a test for the dark universe
• CMB power spectra and cosmological parameters from Planck PR4 with CamSpec
• The evidence for a spatially flat Universe
• Investigating Cosmic Discordance
• New Observational $H(z)$ Data from Full-Spectrum Fitting of Cosmic Chronometers in the LEGA-C Survey
• Revealing the effects of curvature on the cosmological models
• Testing spatial curvature and anisotropic expansion on top of the $\Lambda$CDM model
• Model-independent Curvature Determination from Gravitational-Wave Standard Sirens and Cosmic Chronometers
• Spatial curvature and cosmological tests of general relativity
• Beyond $\Lambda$CDM constraints from the full shape clustering measurements from BOSS and eBOSS
• Model-independent Distance Calibration and Curvature Measurement using Quasars and Cosmic Chronometers
• Spatial curvature endgame: Reaching the limit of curvature determination
• Physical vs phantom dark energy after DESI: thawing quintessence in a curved background
• Cosmological model-independent measurement of cosmic curvature using distance sum rule with the help of gravitational waves
• Measuring cosmic curvature with non-CMB observations
• Investigating the $w$CDM Model with Latest DESI BAO Observations
• Cosmic curvature on large-scale structures with homogeneous dark energy
• High precision measurement of cosmic curvature: from gravitational waves and cosmic chronometer

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• Testing a Sign-Switch Cosmological Model with Curvature through Latest Planck 2018, DESI DR2 and PantheonPlus\&SH0ES Observational Data
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