Gravitating sources with zero energy density in cosmology

arXiv:2609.17604 · gr-qc, astro-ph.CO · Submitted 2026-09-13 · Read on arXiv

gr-qc, astro-ph.CO

Submitted: 2026-09-13

Updated: 2026-09-13

Comments: 36 pages, 3 figures and 2 tables

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

Terminology

• Momentum transfer — 10× in this paper · explained in 2 episodes
• Bulk Viscosity — 9× in this paper · explained in 2 episodes
• Degeneracy — 7× in this paper · explained in 3 episodes
• Consistency — 6× in this paper · explained in 3 episodes
• Hubble Tension — 6× in this paper · explained in 9 episodes
• Clustering — 5× in this paper · explained in 2 episodes
• Generalization — 5× in this paper · explained in 13 episodes
• Anisotropy — 4× in this paper · explained in 3 episodes
• Homogeneity — 4× in this paper · explained in 2 episodes
• Benchmark — 3× in this paper · explained in 2 episodes
• Calibration — 3× in this paper · explained in 7 episodes
• Trace — 3× in this paper · explained in 2 episodes
• Quintessence — 2× in this paper · explained in 2 episodes
• Conservation Laws — 1× in this paper · explained in 3 episodes
• Cooperation — 1× in this paper · explained in 2 episodes
• Equation of State (EoS) — 1× in this paper · explained in 4 episodes
• Gravitational Lensing — 1× in this paper · explained in 2 episodes
• Model-Agnostic — 1× in this paper · explained in 2 episodes
• Regularization — 1× in this paper · explained in 3 episodes
• Robustness — 1× in this paper · explained in 5 episodes
• World Model — 1× in this paper · explained in 7 episodes
• alpha — 1× in this paper · explained in 1 episode

Sources

• Defocusing dark energy: Raychaudhuri diagnostics beyond w<-1/3 and the phantom divide
• Hints of sign-changing scalar field energy density and a transient acceleration phase at $z\sim 2$ from model-agnostic reconstructions
• Revisiting CPL with sign-switching density: To cross or not to cross the NECB
• Model independent evidence for dark energy evolution from Baryon Acoustic Oscillations
• Beyond $\Lambda$CDM with Low and High Redshift Data: Implications for Dark Energy
• Revisiting a negative cosmological constant from low-redshift data
• Graduated dark energy: Observational hints of a spontaneous sign switch in the cosmological constant
• Negative cosmological constant in the dark sector?
• Simple-graduated dark energy and spatial curvature
• Do cosmological observations allow a negative $\Lambda$?
• Omnipotent dark energy: A phenomenological answer to the Hubble tension
• On Redshift Evolution & Negative Dark Energy Density in Pantheon+ Supernovae
• Towards a possible solution to the Hubble tension with Horndeski gravity
• $\Lambda_{\rm s}$CDM cosmology from a type-II minimally modified gravity
• Cosmological constraints on $\Lambda_{\rm s}$CDM scenario in a type II minimally modified gravity
• 2D BAO vs 3D BAO: solving the Hubble tension with an alternative cosmological model
• Unexplored regions in teleparallel $f(T)$ gravity: Sign-changing dark energy density
• Dynamical dark energy with AdS-to-dS and dS-to-dS transitions: Implications for the $H_0$ tension
• A Friendly Phantom: Late-time AdS-to-dS transition and cosmological tensions
• Cosmographic analysis of sign-switching dark energy

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