<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Zimdahl, Winfried</style></author><author><style face="normal" font="default" size="100%">Velten, Hermano E.S.</style></author><author><style face="normal" font="default" size="100%">Algoner, William C.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Matter Growth in Imperfect Fluid Cosmology</style></title><secondary-title><style face="normal" font="default" size="100%">Universe</style></secondary-title></titles><dates><year><style  face="normal" font="default" size="100%">2019</style></year></dates><urls><web-urls><url><style face="normal" font="default" size="100%">http://www.mdpi.com/2218-1997/5/3/68</style></url></web-urls></urls><volume><style face="normal" font="default" size="100%">5</style></volume><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">Extensions of Einstein&amp;rsquo;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 &amp;Lambda; -cold-dark-matter ( &amp;Lambda; CDM) model. As an example, we consider the dynamics of a scalar-tensor extension of the standard model, the e &amp;Phi; &amp;Lambda; CDM 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 &amp;sigma; 8 .</style></abstract><issue><style face="normal" font="default" size="100%">3</style></issue></record></records></xml>