Desvendando a não adiabaticidade da energia escura

Abstract

The aim of this work is to study unusuals dark energy models. Instead of the normally accepted inside the cosmological model, where the perturbations of the cosmic fluids are consider adiabatics, this work investigates dark energy models with nonadiabatic perturbations. We estudy these intrinsic and relative nonadiabatics perturbations for the dark energy, in the context of relativistic cosmological linear perturbation theory. As a result, we observe a non-expected quasi-degeneracy between nonadiabatic dark energy models and ?CDM, that is, nonadiabatic dark energy models are hardly distinguishable from the standard model. Our results are supported by fs8 and cosmic microwave background (CMB) data through the integrated Sachs-Wolfe effect (ISW). A more precise analysis of this topic requires sources of data more rich such as the surveys that are about to come, and a analysis in the nonlinear and second order level to reveal the influence of the nonadiabatic terms in the dark energy.