Wilhelm, Zimdahl Winfried ErnstVelten, Hermano Endlich SchneiderAlgoner Jorge, William Celestino2023-01-182023-01-182019WILHELM, Z. W. E.; VELTEN, H. E. S.; ALGONER JORGE, W. C. Matter growth in imperfect fluid cosmology. Universe, v. 5, n. 68, 2019. Disponível em: <https://www.mdpi.com/2218-1997/5/3/68>. Acesso em: 06 jul. 2022.2218-1997http://www.repositorio.ufop.br/jspui/handle/123456789/16005Extensions of Einstein’s General Relativity (GR) can formally be given a GR structure in which additional geometric degrees of freedom are mapped on an effective energy-momentum tensor. The corresponding effective cosmic medium can then be modeled as an imperfect fluid within GR. The imperfect fluid structure allows us to include, on a phenomenological basis, anisotropic stresses and energy fluxes which are considered as potential signatures for deviations from the cosmological standard Λ-cold-dark-matter (ΛCDM) model. As an example, we consider the dynamics of a scalar-tensor extension of the standard model, the eΦΛCDM model. We constrain the magnitudes of anisotropic pressure and energy flux with the help of redshift-space distortion (RSD) data for the matter growth function f σ8.en-USabertoFluid cosmologyCosmological perturbation theoryScalar-tensor theoryCosmic structure formationArtigo publicado em periodicoThis article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). Fonte: o PDF do artigo.https://doi.org/10.3390/universe5030068