http://arxiv.org/abs/2003.13146
The standard $\Lambda$CDM model of cosmology is formulated as a simple modified gravity coupled to a single scalar field (“darkon”) possessing a non-trivial hidden nonlinear Noether symmetry. The main ingredient in the construction is the use of the formalism of non-Riemannian spacetime volume-elements. The associated Noether conserved current produces stress-energy tensor consisting of two additive parts — dynamically generated dark energy and dark matter components non-interacting among themselves. Noether symmetry breaking via an additional scalar “darkon” potential introduces naturally an interaction between dark energy and dark matter. The correspondence between the $\Lambda$CDM model and the present “darkon” Noether symmetry is exhibited up to linear order w.r.t. gravity-matter perturbations. By breaking the Noether symmetry we obtain $H_0 = 69.18_\pm 4.293$ and $\sigma_8 = 0.7860\pm 0.1106$ from combined data of the direct measurements of the Hubble expansion and growth of matter results, which is closer to latest \textsl{PLANCK} results.
D. Benisty, E. Guendelman, E. Nissimov, et. al.
Tue, 31 Mar 20
70/94
Comments: 10 pages, 1 figure
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