Modified gravity/dynamical dark energy vs ΛCDM: is the game over?
Over the last decades, tests on the standard model of cosmology, the so-called ΛCDM model, have been widely analysed and compared with many different models for describing dark energy. Modified gravities have played an important role in this sense as an alternative to ΛCDM model. Previous observatio...
| Autores: | , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2025 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/392584 |
| Acceso en línea: | http://hdl.handle.net/10261/392584 https://api.elsevier.com/content/abstract/scopus_id/105000342816 |
| Access Level: | acceso abierto |
| Sumario: | Over the last decades, tests on the standard model of cosmology, the so-called ΛCDM model, have been widely analysed and compared with many different models for describing dark energy. Modified gravities have played an important role in this sense as an alternative to ΛCDM model. Previous observational data has been always favouring ΛCDM model in comparison to any other model. While statistically speaking, alternative models have shown their power, fitting in some cases the observational data slightly better than ΛCDM, the significance and goodness of the fits were not significantly relevant to exclude the standard model of cosmology. In this paper, a generalisation of exponential F(R) gravity is considered and compared with ΛCDM model by using the latest observational data. Also some well-known model independent parameterisations for the equation of state (EoS) of dark energy are explored. These scenarios are confronted with the renewed observational data involving the Pantheon plus datasets of supernovae type Ia, the Hubble parameter estimations, data from the cosmic microwave background and baryon acoustic oscillations, where the latter includes the data provided by Dark Energy Spectroscopic Instrument Collaboration. Results of this analysis suggest that standard exponential F(R) models provide much better fits than ΛCDM model, which is excluded at 4σ. Moreover, the parameterisations of the equation of state suggest a non-constant EoS parameter for dark energy, where ΛCDM model is also excluded at 4σ. |
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