Matter growth in imperfect fluid cosmology.

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2019
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Extensions 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.
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Fluid cosmology, Cosmological perturbation theory, Scalar-tensor theory, Cosmic structure formation
Citação
WILHELM, 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.