Varying Gravity from a Modified Fractional Model: Observational Constraints and Slow-Fast Dynamics

arXiv:2607.09722 · physics.gen-ph, astro-ph.CO, gr-qc · Submitted 2026-06-27 · Read on arXiv

Rami Ahmad El-Nabulsi, Genly Leon, Esteban González, Kevin Marroquín

physics.gen-ph, astro-ph.CO, gr-qc

Submitted: 2026-06-27

Comments: 84 pages, 14 compound figures

Code: https://github.com/Nicholaswogan/numbalsoda

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

Terminology

• Hubble Tension — 12× in this paper · explained in 9 episodes
• Quintessence — 10× in this paper · explained in 2 episodes
• Consistency — 8× in this paper · explained in 3 episodes
• Abundance — 5× in this paper · explained in 1 episode
• Degeneracy — 5× in this paper · explained in 3 episodes
• Black Hole Shadows — 4× in this paper
• Cosmic Chronometers — 4× in this paper
• Gravitational Lensing — 4× in this paper · explained in 2 episodes
• Big Bang Nucleosynthesis — 3× in this paper
• Regularization — 3× in this paper · explained in 3 episodes
• Accuracy — 2× in this paper · explained in 1 episode
• Anisotropy — 2× in this paper · explained in 3 episodes
• Bayesian Information Criterion — 2× in this paper
• Clustering — 2× in this paper · explained in 2 episodes
• Dynamical regimes — 2× in this paper · explained in 2 episodes
• Equation of State (EoS) — 2× in this paper · explained in 4 episodes
• Initial Data — 2× in this paper · explained in 2 episodes
• Phase Transitions — 2× in this paper · explained in 2 episodes
• 21-cm signal — 1× in this paper · explained in 1 episode
• Bayesian Inference — 1× in this paper · explained in 5 episodes
• Calibration — 1× in this paper · explained in 7 episodes
• Chebyshev Polynomials — 1× in this paper · explained in 2 episodes
• Decoupling — 1× in this paper · explained in 2 episodes
• Fine-Tuning — 1× in this paper · explained in 5 episodes
• Fractional Renormalization-Group Improved Cosmology — 1× in this paper
• Newtonian Gravity — 1× in this paper
• Nine-year Wilkinson Microwave Anisotropy Probe — 1× in this paper
• Population Synthesis — 1× in this paper · explained in 2 episodes
• Quantization — 1× in this paper · explained in 12 episodes
• Robustness — 1× in this paper · explained in 5 episodes
• Symmetry Breaking — 1× in this paper · explained in 3 episodes
• Trace — 1× in this paper · explained in 2 episodes
• Weak Lensing — 1× in this paper · explained in 2 episodes
• alpha — 1× in this paper · explained in 1 episode

Sources

• Accelerated Expansion from Negative \Lambda
• Evolution of the distance scale factor and the Hubble parameter in the light of Plancks results
• Energy Conditions in f(R, T) Gravity with an Anisotropic Background
• GetDist: a Python package for analysing Monte Carlo samples
• Setting the Stage for Cosmic Chronometers. II. Impact of Stellar Population Synthesis Models Systematics and Full Covariance Matrix
• Measuring the expansion history of the Universe with DESI Cosmic Chronometers
• Union Through UNITY: Cosmology with 2,000 SNe Using a Unified Bayesian Framework
• DESI DR2 Results I: Baryon Acoustic Oscillations from the Lyman Alpha Forest
• DESI DR2 Results II: Measurements of Baryon Acoustic Oscillations and Cosmological Constraints
• Extended Dark Energy analysis using DESI DR2 BAO measurements
• Quintessences Universe in $f(R, L_m)$ gravity with special form of deceleration parameter
• Observational constraints on the jerk parameter with the data of the Hubble parameter

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