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http://www.repositorio.ufop.br/jspui/handle/123456789/16008
Título: | On (non-)dynamical dark energy. |
Autor(es): | Wilhelm, Zimdahl Winfried Ernst Fabris, Júlio César Velten, Hermano Endlich Schneider González Herrera, Manuel Ramón |
Data do documento: | 2020 |
Referência: | WILHELM, Z. W. E. et al. On (non-)dynamical dark energy. Physics of the Dark Universe, v. 30, artigo 100681, 2020. Disponível em: <https://www.sciencedirect.com/science/article/pii/S2212686420303125?via%3Dihub>. Acesso em: 06 jul. 2022. |
Resumo: | The current Universe is composed by a mixture of relativistic species, baryonic matter, dark matter and dark energy which evolve in a non-trivial way at perturbative level. An advanced description of the cosmological dynamics should include non-standard features beyond the simplistic approach idealized by the standard cosmology in which cosmic components do not interact, are adiabatic and dissipationless. We promote a full perturbative analysis of linear scalar perturbations of a non- interacting cosmological model containing baryons, dark matter (both pressureless) and a scalar field allowing for the presence of relative entropic perturbations between the three fluids. Assuming an effective scalar-field sound speed equal to one and neglecting anisotropic stresses we establish a new set of equations for the scalar cosmological perturbations. As a consequence of this new approach, we show that tiny departures from a constant scalar field equation of state wS = −1 damage structure formation in a non-acceptable manner. Hence, by strongly constraining wS our results provide compelling evidence in favor of the standard cosmological model and rule out a large class of dynamical dark energy models. |
URI: | http://www.repositorio.ufop.br/jspui/handle/123456789/16008 |
Link para o artigo: | https://www.sciencedirect.com/science/article/pii/S2212686420303125?via%3Dihub |
DOI: | https://doi.org/10.1016/j.dark.2020.100681 |
ISSN: | 2212-6864 |
Aparece nas coleções: | DEFIS - Artigos publicados em periódicos |
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ARTIGO_DynamicalDarkEnergy.pdf Restricted Access | 464,44 kB | Adobe PDF | Visualizar/Abrir |
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