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Título: | Dark energy in multifractional spacetimes |
Autor: | Calcagni, Gianluca CSIC ORCID ; Felice, Antonio de | Fecha de publicación: | 23-nov-2020 | Editor: | American Physical Society | Citación: | Physical Review D 102: 103529 (2020) | Resumen: | We study the possibility to obtain cosmological late-time acceleration from a geometry changing with the scale, in particular, in the so-called multifractional theories with q-derivatives and with weighted derivatives. In the theory with q-derivatives, the luminosity distance is the same as in general relativity and, therefore, geometry cannot act as dark energy. In the theory with weighted derivatives, geometry alone is able to sustain a late-time acceleration phase without fine tuning, while being compatible with structure-formation and big-bang nucleosynthesis bounds. This suggests to extend the theory, in a natural way, from just small-scale to also large-scale modifications of gravity. Surprisingly, the Hausdorff dimension of spacetime is constrained to be close to the topological dimension 4. After arguing that this finding might not be a numerical coincidence, we conclude that present-day acceleration could be regarded as the effect of a new restoration law for spacetime geometry. | Descripción: | 17 pags., 7 figs., 2 tabs. | Versión del editor: | http://dx.doi.org/10.1103/PhysRevD.102.103529 | URI: | http://hdl.handle.net/10261/225823 | DOI: | 10.1103/PhysRevD.102.103529 | Identificadores: | doi: 10.1103/PhysRevD.102.103529 issn: 2470-0029 |
Aparece en las colecciones: | (CFMAC-IEM) Artículos |
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Dark energy.pdf | 2,39 MB | Adobe PDF | Visualizar/Abrir |
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