Revisiting cosmic acceleration with DESI BAO

Abstract

We revisit the evolution of cosmic acceleration in a spatially flat $w_0{w}_a$CDM universe, in which the equation of state of dark energy takes the CPL parametrization, using the latest baryon acoustic oscillation (BAO) measurements from the Dark Energy Spectroscopic Instrument (DESI), in combination with Planck cosmic microwave background (CMB) data and several type Ia supernova datasets, including PantheonPlus, Union3, and DESY5. We analyze the deceleration parameter $q(z)$ and the jerk parameter $j(z)$ and further validate our results using the $Om(z)$ diagnostic. Our findings indicate significant deviations from the predictions of the $\Lambda$CDM model. Specifically, DESI BAO, DESI BAO + CMB, DESI BAO + CMB + Union3, and DESI BAO + CMB + DESY5 all provide strong evidence for a slowing down of cosmic acceleration at late times, as indicated by $j(0)<0$ at more than 1$\sigma$ confidence level, within the framework of $w_0{w}_a$CDM model. These results suggest that in the $w_0{w}_a$CDM universe cosmic acceleration has already peaked and is now in a phase of decline.

References in corpus (70)

• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
• Nine-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Parameter Results
• Efficient Computation of CMB anisotropies in closed FRW models
• Detection of the Baryon Acoustic Peak in the Large-Scale Correlation Function of SDSS Luminous Red Galaxies
• Exploring the Expansion History of the Universe
• Accelerating Universes with Scaling Dark Matter
• Baryon Acoustic Oscillations in the Sloan Digital Sky Survey Data Release 7 Galaxy Sample
• Statefinder -- a new geometrical diagnostic of dark energy
• The Pantheon+ Analysis: Cosmological Constraints
• DESI 2024 VI: Cosmological Constraints from the Measurements of Baryon Acoustic Oscillations
• Improved Dark Energy Constraints from ~100 New CfA Supernova Type Ia Light Curves
• Two new diagnostics of dark energy
• Cobaya: Code for Bayesian Analysis of hierarchical physical models
• Jerk, snap, and the cosmological equation of state
• CfA3: 185 Type Ia Supernova Light Curves from the CfA
• CMB power spectrum parameter degeneracies in the era of precision cosmology
• The Early Data Release of the Dark Energy Spectroscopic Instrument
• A kinematical approach to dark energy studies
• DESI 2024 III: Baryon Acoustic Oscillations from Galaxies and Quasars
• DESI 2024 IV: Baryon Acoustic Oscillations from the Lyman Alpha Forest
• Is cosmic acceleration slowing down?
• DESI 2024: Reconstructing Dark Energy using Crossing Statistics with DESI DR1 BAO data
• Robust Preference for Dynamical Dark Energy in DESI BAO and SN Measurements
• A litmus test for Lambda
• Interacting Dark Energy after DESI Baryon Acoustic Oscillation measurements
• Assessing observational constraints on dark energy
• An improved model-independent assessment of the late-time cosmic expansion
• Interpreting DESI's evidence for evolving dark energy
• Constraints on Interacting Dark Energy Models from the DESI Baryon Acoustic Oscillation and DES Supernovae Data
• Scant evidence for thawing quintessence
• Quintessential interpretation of the evolving dark energy in light of DESI
• The Pantheon+ Analysis: Evaluating Peculiar Velocity Corrections in Cosmological Analyses with Nearby Type Ia Supernovae
• Using non-DESI data to confirm and strengthen the DESI 2024 spatially-flat $w_0{w}_a$CDM cosmological parameterization result
• Interpreting DESI 2024 BAO: late-time dynamical dark energy or a local effect?
• Examining the cosmic acceleration with the latest Union2 supernova data
• Matching current observational constraints with nonminimally coupled dark energy
• Quintom cosmology and modified gravity after DESI 2024
• $Om$ diagnostic applied to scalar field models and slowing down of cosmic acceleration
• An overview of what current data can (and cannot yet) say about evolving dark energy
• A new diagnostic for the null test of dynamical dark energy in light of DESI 2024 and other BAO data
• Cosmic slowing down of acceleration for several dark energy parametrizations
• Model-agnostic assessment of dark energy after DESI DR1 BAO
• Could the cosmic acceleration be transient? A cosmographic evaluation
• Union Through UNITY: Cosmology with 2,000 SNe Using a Unified Bayesian Framework
• Quantifying Scalar Field Dynamics with DESI 2024 Y1 BAO measurements
• Transient cosmic acceleration from interacting fluids
• Crossing Statistic: Reconstructing the Expansion History of the Universe
• Composite Dark Energy and the Cosmological Tensions
• Phenomenological emergent dark energy in the light of DESI Data Release 1
• Dynamical dark energy in the light of DESI 2024 data
• The Dark Energy Survey: Cosmology Results With ~1500 New High-redshift Type Ia Supernovae Using The Full 5-year Dataset
• Impacts of dark energy on weighing neutrinos after DESI BAO
• Detecting the cosmic acceleration with current data
• Optimal parameterizations for observational constraints on thawing dark energy
• Probing Cosmic Acceleration by Using the SNLS3 SNIa Dataset
• {\it Gauging} the cosmic acceleration with recent type Ia supernovae data sets
• Key drivers of the preference for dynamic dark energy
• Perturbations for transient acceleration
• Asymmetry in the reconstructed deceleration parameter
• The role of curvature in the slowing down acceleration scenario
• Probing the course of cosmic expansion with a combination of observational data
• Physical condition for the slowing down of cosmic acceleration
• Re-examining the role of curvature in the slowing down acceleration scenario
• Probing the cosmic acceleration from combinations of different data sets
• Cosmokinetics
• Bimetric gravity improves the fit to DESI BAO and eases the Hubble tension
• Quantum Gravity Meets DESI: Dynamical Dark Energy in Light of the Trans-Planckian Censorship Conjecture
• Braneworld Dark Energy in light of DESI DR2
• Questioning Cosmic Acceleration with DESI: The Big Stall of the Universe
• Dynamical Dark Energy from $F(R)$ Gravity Models Unifying Inflation with Dark Energy: Confronting the Latest Observational Data

Cited by in corpus (5)

• Robust evidence for dynamical dark energy in light of DESI DR2 and joint ACT, SPT, and Planck data
• Dark Energy in the DESI Era: A Brief Review of Evidence, Beyond-$\Lambda$CDM Interpretations, and Tensions
• Measuring neutrino mass in light of ACT DR6 and DESI DR2
• Agegraphic dark energy from entropy of the anti-de Sitter black hole
• Observational Constraints and Cosmological Dynamics of Interacting Fractional Holographic Dark Energy in Light of DESI DR2