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Cosmological volume acceleration in dust epoch: using scaling solutions and variable cosmological term \(\Lambda (t)\) within an anisotropic cosmological model

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Abstract

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 anisotropic 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. Furthermore, the scalar field is identified with a varying cosmological term via \(V(\phi (t))=2\Lambda (t)\). Exact solutions to the EKG system are obtained by proposing an anisotropic extension of the scaling solutions scenario: \(\rho \sim \eta ^{-n}, \rho _{\phi }\sim \eta ^{-{m}}\), with \(\eta ^{3}={a}_{1}{a}_{2}{a}_{3}\) the volume function of the anisotropic model (\({a_{1}}, {a_{2}}, {a_{3}}\) being the scale factors).

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Acknowledgements

This work was partially supported by PROMEP grants UGTO-CA-3. S.P.P. and J.S. were partially supported SNI-CONACYT. This work is part of the collaboration within the Instituto Avanzado de Cosmología and Red PROMEP: Gravitation and Mathematical Physics under project Quantum aspects of gravity in cosmological models, phenomenology and geometry of space-time. Many calculations where done by Symbolic Program REDUCE 3.8.

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Correspondence to J. Socorro.

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Socorro, J., Pérez-Payán, S., Espinoza-García, A. et al. Cosmological volume acceleration in dust epoch: using scaling solutions and variable cosmological term \(\Lambda (t)\) within an anisotropic cosmological model. Astrophys Space Sci 365, 93 (2020). https://doi.org/10.1007/s10509-020-03810-9

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  • DOI: https://doi.org/10.1007/s10509-020-03810-9

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