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Anisotropic solid dark energy
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DOI：10.1016/j.dark.2021.100806.png)
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Abstract
En 中文
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 a 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 can give an account of a non-negligible spatial shear within the observational bounds nowadays, even when the later is set to zero at early times. However, we find that there is a particular region in the parameter space of the model in which the Universe isotropizes. The anisotropic attractors, the particular isotropic region, and a nearly constant equation of state of dark energy very close to -1 are key features of this scenario. Following a similar approach, we also analyzed the full isotropic version of the model. We find that the solid can be characterized by a constant equation of state and thus being able to simulate the behavior of a cosmological constant. (C) 2021 Elsevier B.V. All rights reserved.
Keywords:
PROBE WMAP OBSERVATIONS
CONSTANT
UNIVERSE
COSMOLOGY
LAMBDA
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