Cosmological volume acceleration in dust epoch: using scaling solutions and variable cosmological term $��(t)$ within an anisotropic cosmological model
| Autor: | Socorro, J., P��rez-Pay��n, S., Espinoza-Garc��a, Abraham, D��az-Barr��n, Luis Rey |
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| Rok vydání: | 2019 |
| Předmět: | |
| DOI: | 10.48550/arxiv.1911.09094 |
| Popis: | Under the premise that the current observations of the cosmic microwave background radiation set a very stringent limit to the anisotropy of the universe, we consider an anistropic model in the presence of a barotropic perfect fluid and a homogeneous scalar field, which transits to a flat FRW cosmology for late times in a dust epoch, presenting an accelerated volume expansion. Furtheremore, the scalar field is identified with a varying cosmological term via $V(��(t))=2��(t)$. Exact solutions to the EKG system are obtained by proposing an anisotropic extension of the scaling solutions scenario: $\rm��\sim ��^{-n},\ ��_��\sim ��^{-m}$, with $\rm��^3=a_1a_2a_3$ the volume function of the anistropic model ($\rm a_1,\, a_2,\, a_3$ being the scale factors). 12 pages, two figures, Mayor changes in abstract, introduction and title, and we add 11 references. To publish in Astrophysics Space Science Journal |
| Databáze: | OpenAIRE |
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