Abstract
In this article we investigate and develop specific aspects of Friedmann-Robertson-Walker (FRW) scalar field cosmologies related to the interpretation that canonical and phantom scalar field sources may be interpreted as cosmological configurations with a mixture of two interacting barotropic perfect fluids: a matter component ρ 1(t) with a stiff equation of state (p 1=ρ 1), and an “effective vacuum energy” ρ 2(t) with a cosmological constant equation of state (p 2=−ρ 2). An important characteristic of this alternative equivalent formulation in the framework of interacting cosmologies is that it gives, by choosing a suitable form of the interacting term Q, an approach for obtaining exact and numerical solutions. The choice of Q merely determines a specific scalar field with its potential, thus allowing to generate closed, open and flat FRW scalar field cosmologies.
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Acknowledgements
This work was supported by CONICYT through Grants FONDECYT N0 1080530 (MC), N0 21070949 (FA) and N0 21070462 (PM) and by Dirección de Investigación de la Universidad del Bío–Bío through grants N0 DIUBB 121007 2/R and N0 GI121407/VBC (MC, FA, PM).
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Cataldo, M., Arévalo, F. & Mella, P. Canonical and phantom scalar fields as an interaction of two perfect fluids. Astrophys Space Sci 344, 495–503 (2013). https://doi.org/10.1007/s10509-012-1346-5
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DOI: https://doi.org/10.1007/s10509-012-1346-5