http://arxiv.org/abs/2012.09946
In this paper, we study a triad of inhomogeneous scalar fields, known as “solid”, as a source of homogeneous but anisotropic dark energy. By using the dynamical system approach, we find that anisotropic accelerated solutions can be realized as attractor points for suitable choices of the parameters of the model. We complement the dynamical analysis with a numerical solution whose initial conditions are set in the deep radiation epoch. The model predicts a non-negligible spatial shear within the observational bounds nowadays, even when it is set to zero at early times. The anisotropic attractor and the ultra slowly varying equation of state of dark energy very close to $- 1$ are key features of this scenario. Following a similar approach, we also analyzed the isotropic version of the model. We find that the solid can be characterized by a nearly constant equation of state and thus being able to simulate the behavior of a cosmological constant.
J. Motoa-Manzano, J. Orjuela-Quintana, T. Pereira, et. al.
Mon, 21 Dec 20
32/75
Comments: LaTeX file in RevTeX 4.1 style, 14 pages, 6 figures
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