On (non-)dynamical dark energy.

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MetadadosDescriçãoIdioma
Autor(es): dc.creatorWilhelm, Zimdahl Winfried Ernst-
Autor(es): dc.creatorFabris, Júlio César-
Autor(es): dc.creatorVelten, Hermano Endlich Schneider-
Autor(es): dc.creatorGonzález Herrera, Manuel Ramón-
Data de aceite: dc.date.accessioned2025-08-21T15:13:16Z-
Data de disponibilização: dc.date.available2025-08-21T15:13:16Z-
Data de envio: dc.date.issued2023-01-17-
Data de envio: dc.date.issued2023-01-17-
Data de envio: dc.date.issued2019-
Fonte completa do material: dc.identifierhttp://www.repositorio.ufop.br/jspui/handle/123456789/16008-
Fonte completa do material: dc.identifierhttps://www.sciencedirect.com/science/article/pii/S2212686420303125?via%3Dihub-
Fonte completa do material: dc.identifierhttps://doi.org/10.1016/j.dark.2020.100681-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/capes/1006632-
Descrição: dc.descriptionThe 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.-
Formato: dc.formatapplication/pdf-
Idioma: dc.languageen-
Direitos: dc.rightsrestrito-
Título: dc.titleOn (non-)dynamical dark energy.-
Aparece nas coleções:Repositório Institucional - UFOP

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