Revisiting Metastable Dark Energy in Light of DESI DR2 BAO and DESI DR1 Full-Shape Measurements

arXiv:2608.01844 · astro-ph.CO, gr-qc · Submitted 2026-08-03 · Read on arXiv

Purba Mukherjee, Arman Shafieloo, Varun Sahni

astro-ph.CO, gr-qc

Submitted: 2026-08-03

Comments: 16 pages, 14 figures. Comments are welcome

Code: https://github.com/lesgourg/class_public

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Terminology

• Clustering — 18× in this paper · explained in 2 episodes
• Abundance — 14× in this paper · explained in 1 episode
• Quintessence — 6× in this paper · explained in 2 episodes
• Matter Power Spectrum — 3× in this paper · explained in 2 episodes
• Anti-correlation — 2× in this paper · explained in 3 episodes
• Consistency — 2× in this paper · explained in 3 episodes
• Degeneracy — 2× in this paper · explained in 3 episodes
• Anisotropy — 1× in this paper · explained in 3 episodes
• Calibration — 1× in this paper · explained in 7 episodes
• Equation of State (EoS) — 1× in this paper · explained in 4 episodes
• Hubble Tension — 1× in this paper · explained in 9 episodes
• Trace — 1× in this paper · explained in 2 episodes
• Weak Lensing — 1× in this paper · explained in 2 episodes

Sources

• Planck 2018 results. VI. Cosmological parameters
• The Atacama Cosmology Telescope: DR6 Power Spectra, Likelihoods and $\Lambda$CDM Parameters
• SPT-3G D1: CMB temperature and polarization power spectra and cosmology from 2019 and 2020 observations of the SPT-3G Main field
• The Pantheon+ Analysis: The Full Dataset and Light-Curve Release
• The Dark Energy Survey: Cosmology Results With ~1500 New High-redshift Type Ia Supernovae Using The Full 5-year Dataset
• The Completed SDSS-IV extended Baryon Oscillation Spectroscopic Survey: Cosmological Implications from two Decades of Spectroscopic Surveys at the Apache Point observatory
• DESI DR2 Results II: Measurements of Baryon Acoustic Oscillations and Cosmological Constraints
• DESI 2024 V: Full-Shape Galaxy Clustering from Galaxies and Quasars
• Cosmological Constant - the Weight of the Vacuum
• Cosmological tensions in the era of precision cosmology: Insights from Tensions in Cosmology 2025
• The CosmoVerse White Paper: Addressing observational tensions in cosmology with systematics and fundamental physics
• Tensions between the Early and the Late Universe
• The Local Distance Network: a community consensus report on the measurement of the Hubble constant at 1% precision
• Dark Energy Survey Year 6 Results: Cosmological Constraints from Galaxy Clustering and Weak Lensing
• A population of red candidate massive galaxies ~600 Myr after the Big Bang
• Stress Testing $\Lambda$CDM with High-redshift Galaxy Candidates
• Accelerating Universes with Scaling Dark Matter
• Exploring the Expansion History of the Universe
• Extended Dark Energy analysis using DESI DR2 BAO measurements
• New Expansion Rate Anomalies at Characteristic Redshifts Geometrically Determined using DESI-DR2 BAO and DES-SN5YR Observations

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