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Class of Exact Solutions for a Cosmological Model of Unified Gravitational and Quintessence Fields

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Abstract

A new approach to tackle Einstein equations for an isotropic and homogeneous Friedmann–Robertson–Walker Universe in the presence of a quintessence scalar field is devised. It provides a way to get a simple exact solution to these equations. This solution determines the quintessence potential uniquely and it differs from solutions which have been used to study inflation previously. It relays on a unification of geometry and dark matter implemented through the definition of a functional relation between the scale factor of the Universe and the quintessence field. For a positive curvature Universe, this solution produces perpetual accelerated expansion rate of the Universe, while the Hubble parameter increases abruptly, attains a maximum value and decreases thereafter. The behavior of this cosmological solution is discussed and its main features are displayed. The formalism is extended to include matter and radiation.

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Acknowledgements

F.A.A. thanks the CONICyT-Chile for partial support through Funding No. 79130002. S.A.H. expresses his gratitude to Rafael Rosende for his enthusiastic support.

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Correspondence to Felipe A. Asenjo.

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Asenjo, F.A., Hojman, S.A. Class of Exact Solutions for a Cosmological Model of Unified Gravitational and Quintessence Fields. Found Phys 47, 887–896 (2017). https://doi.org/10.1007/s10701-017-0091-6

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  • DOI: https://doi.org/10.1007/s10701-017-0091-6

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