Speaker
Description
In a recent publication, we derived a general relativity (RG) gauge-invariant solution modelling a granular universe composed of spherical bodies with a radial Gaussian density profile. In this framework, a cosmological constant Λ emerges natively from the gravitational self-energy of these discrete nodes. Energy conservation dictates a uniform compactness ratio M/σ^2 across all bodies, a relation closely met by the elliptical galaxies as shown in the GAMA survey. This setup yields: Λ≈1/(12 π^3) (κ a c^2 M/ σ^2)^2 which, using the compactness measured in the GAMA survey, evaluates to Λ≈0.9 x 10^-52 m^-2, a value close to modern observations. The model predicts the R = k (1+z)^-1.5 size scaling confirmed by the 3D-HST+CANDELS survey and, unlike standard ΛCDM theory, the model preserves total energy conservation.
Before gas clouds collapsing around z≈3 the universe was mostly homogeneous resulting in this model to Λ≈0. During the Lyman-α forest epoch an intense gas clouds collapsing into stars and black holes occurred. We extended our RG model to purely radial collapsing nodes which gave (κa^2/4 π^3 R^2) M d^2R/dt^2 < 0 . This backreaction force of the gas cloud collapse reached a peak around z≈2 , and later declined around z≈1.5 when massive galaxies ran out of cold gas or experienced quenching shutting down their star formation. At this epoch, the galaxies began their assembling into their modern structures, raising the cosmological constant to its current baseline value.
Integrating this dynamical Λ(z), while targeting the current Hubble parameter of H0 = 73 km/s/Mpc , yields a perfect validation against the Planck cosmic microwave background angular scale θ*=0.010410 and the latest DESI BAO data. Notably, the model predicts a structure clustering amplitude of S8≈0.81 in line with the BOSS/DESI Deep Scale Galaxy Clustering data survey. The proposed model successfully bypasses the need for an unexplained, speculative dark energy burst.