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Hlavní autor: Adriano, Paulo
Médium: Recurso digital
Jazyk:angličtina
Vydáno: Zenodo 2025
Témata:
scalar–tensor gravity Einstein gravity completion unified dark sector cosmological scalar field modified gravity effective field theory (EFT) early dark energy Hubble tension (H₀ tension) S8 tension large-scale structure growth non-singular bounce cosmology cosmic turnaround screened fifth forces no-slip gravity dark matter without particles
On-line přístup:https://doi.org/10.5281/zenodo.17731313
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  • <p>We present a scalar–tensor completion of Einstein gravity, based on the MMA-DMF [1] in which a single light scalar field ϕ replaces both cold dark matter and dark energy at the level of cosmological phenomenology. The model is formulated as an effective field theory (EFT) valid below a cutoff scale Λ, with screened fifth forces on small scales [2] and a controlled modification of the background expansion and the growth of structure at late times. We show how a non-singular “reset” phase, an early-time bump in the expansion rate, a standard radiation and baryon dominated era, the present acceleration and a future turnaround can all be obtained from one scalar potential and its coupling to matter, without introducing additional dark fluids. We summarise the agreement with CMB [3], BAO, H0 and large-scale structure observables obtained in previous phenomenological studies of this model.</p>

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