Completing Einstein Gravity with a Single Scalar: Cosmic History without Dark Matter or Dark Energy
Fuente:
Zenodo
Guardado en:
| Autor principal: | |
|---|---|
| Formato: | Recurso digital |
| Lenguaje: | inglés |
| Publicado: |
Zenodo
2025
|
| Materias: | |
| Acceso en línea: | |
| Etiquetas: |
Agregar Etiqueta
Sin Etiquetas, Sea el primero en etiquetar este registro!
|
| _version_ | 1866901181976018944 |
|---|---|
| author | Adriano, Paulo |
| author_facet | Adriano, Paulo |
| contents | <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> |
| format | Recurso digital |
| id | zenodo_https___doi_org_10_5281_zenodo_17731313 |
| institution | Zenodo |
| language | eng |
| publishDate | 2025 |
| publisher | Zenodo |
| record_format | zenodo |
| spellingShingle | Completing Einstein Gravity with a Single Scalar: Cosmic History without Dark Matter or Dark Energy Adriano, Paulo 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 <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> |
| title | Completing Einstein Gravity with a Single Scalar: Cosmic History without Dark Matter or Dark Energy |
| topic | 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 |
| url | https://doi.org/10.5281/zenodo.17731313 |