Breaking the Dark Sector Degeneracy with Nonparametric Expansion--Growth Reconstruction

arXiv:2607.11813 · astro-ph.CO, gr-qc, hep-ph · Submitted 2026-07-13 · Read on arXiv

Changyu You, Rong-Gen Cai, Tao Yang

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

Submitted: 2026-07-13

Comments: 8 pages + 14 pages, 9 figures, comments welcome

Code: https://github.com/PantheonPlusSH0ES/DataRelease

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

Terminology

• Calibration — 17× in this paper · explained in 7 episodes
• Degeneracy — 14× in this paper · explained in 3 episodes
• Quintessence — 12× in this paper · explained in 2 episodes
• Consistency — 9× in this paper · explained in 3 episodes
• Gaussian Process — 9× in this paper
• Redshift-Space Distortion — 9× in this paper
• Interacting Dark Energy — 8× in this paper
• Clustering — 5× in this paper · explained in 2 episodes
• Momentum transfer — 4× in this paper · explained in 2 episodes
• Equation of State (EoS) — 2× in this paper · explained in 4 episodes
• Hubble Tension — 2× in this paper · explained in 9 episodes
• Nonminimal coupling — 2× in this paper · explained in 2 episodes
• Robustness — 2× in this paper · explained in 5 episodes
• Symbolic Regression — 2× in this paper · explained in 5 episodes
• Accuracy — 1× in this paper · explained in 1 episode
• Anisotropy — 1× in this paper · explained in 3 episodes
• Conservation Laws — 1× in this paper · explained in 3 episodes
• Dark Energy Spectroscopic Instrument — 1× in this paper
• Decoupling — 1× in this paper · explained in 2 episodes
• Higher-order derivatives — 1× in this paper · explained in 2 episodes
• Model-Agnostic — 1× in this paper · explained in 2 episodes
• Nine-Year Wilkinson Microwave Anisotropy Probe — 1× in this paper
• Pantheon Plus — 1× in this paper
• Physical Constraints — 1× in this paper · explained in 7 episodes
• Redshift-Space Distortions (RSD) — 1× in this paper · explained in 2 episodes

Sources

• Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant
• Measurements of Omega and Lambda from 42 High-Redshift Supernovae
• Cosmological parameters from SDSS and WMAP
• Detection of the Baryon Acoustic Peak in the Large-Scale Correlation Function of SDSS Luminous Red Galaxies
• Nine-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Parameter Results
• The clustering of galaxies in the SDSS-III Baryon Oscillation Spectroscopic Survey: single-probe measurements and the strong power of normalized growth rate on constraining dark energy
• Planck 2018 results. VI. Cosmological parameters
• Quintessence, Cosmic Coincidence, and the Cosmological Constant
• The Case for a Positive Cosmological Lambda-term
• The Cosmological Constant Problems (Talk given at Dark Matter 2000, February, 2000)
• 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
• Dynamics of dark energy
• Quintessence: A Review
• Essentials of k-essence
• The Dynamics of Quintessence, The Quintessence of Dynamics
• Quintessence and phantom cosmology with non-minimal derivative coupling
• Dark Energy versus Modified Gravity
• Modified Gravity and Cosmology
• Models of f(R) Cosmic Acceleration that Evade Solar-System Tests
• Coupled Quintessence

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