Is dark energy increasing or decreasing in the late universe? — E8 Intelligence Research
Year: 2026
Type: preprint
Abstract: The concordance cosmological model ΛCDM assumes dark energy to be a constant, consistent with early-time observations, evidenced by Planck-ΛCDM analyses. However, in the face of late-time tensions, the nature of dark energy remains a central open problem. Modern precision cosmology offers a potential new window into the nature of dark energy in the w(a)CDM framework, which provides a model-independent prescription for its unknown equation of state w(a). A confrontation of w(a)CDM with data generally constitutes a nonlinear inference problem. We find that w0wa estimates posterior to a fully non-linear w(a) analysis are stabilized by the Baryon Acoustic Oscillation (BAO) constraint on cM=Ωm,0h2 Author: Andrew Stewart Caldin, Independent Researcher, UK. Part of the E8 Intelligence Research series. Platform: e8intelligence.com
Author: Caldin, Andrew Stewart
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7225396193