Unifying Early and Late Dark Energy: Dynamical Requirements and Obstructions

arXiv:2605.26116 · astro-ph.CO, gr-qc, hep-ph · Submitted 2026-05-25 · Read on arXiv

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

Submitted: 2026-05-25

Updated: 2026-09-23

Terminology

• Dark Energy — 149× in this paper
• Early Dark Energy — 65× in this paper
• Hubble Tension — 59× in this paper · explained in 9 episodes
• Dynamical regimes — 7× in this paper · explained in 2 episodes
• Consistency — 6× in this paper · explained in 3 episodes
• Calibration — 4× in this paper · explained in 7 episodes
• Quintessence — 4× in this paper · explained in 2 episodes
• Abundance — 3× in this paper · explained in 1 episode
• Anisotropy — 3× in this paper · explained in 3 episodes
• Cosmic Microwave Background — 3× in this paper
• Decoupling — 3× in this paper · explained in 2 episodes
• Weak Lensing — 3× in this paper · explained in 2 episodes
• Accuracy — 2× in this paper · explained in 1 episode
• Cosmic Linear Anisotropy Solving System — 2× in this paper
• ACT Data — 1× in this paper · explained in 1 episode
• Benchmark — 1× in this paper · explained in 2 episodes
• Clustering — 1× in this paper · explained in 2 episodes
• Degeneracy — 1× in this paper · explained in 3 episodes
• Fine-Tuning — 1× in this paper · explained in 5 episodes
• Gravitational Lensing — 1× in this paper · explained in 2 episodes
• In General Relativity — 1× in this paper
• Robustness — 1× in this paper · explained in 5 episodes
• Structural Constraints — 1× in this paper · explained in 2 episodes
• Unified Framework — 1× in this paper · explained in 5 episodes
• alpha — 1× in this paper · explained in 1 episode

Sources

• Evidence for dark energy from the cosmic microwave background alone using the Atacama Cosmology Telescope lensing measurements
• A 6% measurement of the Hubble parameter at $z\sim0.45$: direct evidence of the epoch of cosmic re-acceleration
• Is the expansion of the universe accelerating? All signs point to yes
• Strong evidence for an accelerating universe
• Planck 2018 results. VI. Cosmological parameters
• The evidence of cosmic acceleration and observational constraints
• Soundness of Dark Energy properties
• Testing Low-Redshift Cosmic Acceleration with Large-Scale Structure
• Evidence for Cosmic Acceleration is Robust to Observed Correlations Between Type Ia Supernova Luminosity and Stellar Age
• Cosmological Constraints from DES Y1 Cluster Abundances and SPT Multi-wavelength data
• The Completed SDSS-IV extended Baryon Oscillation Spectroscopic Survey: Cosmological Implications from two Decades of Spectroscopic Surveys at the Apache Point observatory
• The Atacama Cosmology Telescope: A Measurement of the DR6 CMB Lensing Power Spectrum and its Implications for Structure Growth
• The Atacama Cosmology Telescope: DR6 Gravitational Lensing Map and Cosmological Parameters
• Cosmology From CMB Lensing and Delensed EE Power Spectra Using 2019-2020 SPT-3G Polarization Data
• DESI 2024 VI: Cosmological Constraints from the Measurements of Baryon Acoustic Oscillations
• SPT-3G D1: CMB temperature and polarization power spectra and cosmology from 2019 and 2020 observations of the SPT-3G Main field
• KiDS-Legacy: Consistency of cosmic shear measurements and joint cosmological constraints with external probes
• KiDS-Legacy: Cosmological constraints from cosmic shear with the complete Kilo-Degree Survey
• DESI DR2 Results II: Measurements of Baryon Acoustic Oscillations and Cosmological Constraints
• The Pantheon+ Analysis: The Full Dataset and Light-Curve Release

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