To CPL, or not to CPL? What we have not learned about the dark energy equation of state

arXiv:2503.22529 · astro-ph.CO, gr-qc, hep-ph, hep-th · Submitted 2025-03-28 · Read on arXiv

astro-ph.CO, gr-qc, hep-ph, hep-th

Submitted: 2025-03-28

Updated: 2026-09-01

Code: https://github.com/snesseris/DESI_CPL

Terminology

• Quintessence — 4× in this paper · explained in 2 episodes
• Model-Agnostic — 3× in this paper · explained in 2 episodes
• Dark Energy Spectroscopic Instrument — 2× in this paper
• Dark Energy Survey — 2× in this paper
• Abundance — 1× in this paper · explained in 1 episode
• Anisotropy — 1× in this paper · explained in 3 episodes
• Bayesian Inference — 1× in this paper · explained in 5 episodes
• Calibration — 1× in this paper · explained in 7 episodes
• Higher-order derivatives — 1× in this paper · explained in 2 episodes
• Parsimony — 1× in this paper · explained in 2 episodes

Sources

• Measurements of Omega and Lambda from 42 High-Redshift Supernovae
• Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant
• Everything You Always Wanted To Know About The Cosmological Constant Problem (But Were Afraid To Ask)
• The Cosmological Constant Problem: Why it's hard to get Dark Energy from Micro-physics
• Dynamics of dark energy
• De Sitter Space and the Swampland
• Accelerating Universes with Scaling Dark Matter
• Exploring the Expansion History of the Universe
• The Dynamics of Quintessence, The Quintessence of Dynamics
• Interpreting Dark Energy Data Away from $\Lambda$
• Parameterization of Dark-Energy Properties: a Principal-Component Approach
• Expansion-history preferences of DESI DR2 and external data
• Nonparametric reconstructions of dynamical dark energy via flexknots
• Reconstructing the dark energy density in light of DESI BAO observations
• Comparison of dynamical dark energy with {\Lambda}CDM in light of DESI DR2
• DESI 2024 VI: Cosmological Constraints from the Measurements of Baryon Acoustic Oscillations
• The Pantheon+ Analysis: The Full Dataset and Light-Curve Release
• Planck 2018 results. VI. Cosmological parameters
• Robust and model-independent cosmological constraints from distance measurements
• A tale of two (or more) $h$'s

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