Ricci curvature non-minimal derivative coupling cosmology with field re-scaling

Ricci curvature non-minimal derivative coupling cosmology with field re-scaling In this letter, cosmology of a simple NMDC gravity with $$\xi R \phi _{,\mu }\phi ^{,\mu }$$ ξ R ϕ , μ ϕ , μ term and a free kinetic term is considered in flat geometry and in presence of dust matter. A logarithm field transformation $$\phi ' = \mu \ln \phi $$ ϕ ′ = μ ln ϕ is proposed phenomenologically. Assuming slow-roll approximation, equation of motion, scalar field solution and potential are derived as function of kinematic variables. The field solution and potential are found straightforwardly for power-law, de-Sitter and super-acceleration expansions. Slow-roll parameters and slow-roll condition are found to depend on more than one variable. At large field the re-scaling effect can enhance the acceleration. For slow-rolling field, the negative coupling $$\xi $$ ξ could enhance the effect of acceleration. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png General Relativity and Gravitation Springer Journals

Ricci curvature non-minimal derivative coupling cosmology with field re-scaling

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Springer US
Copyright © 2017 by Springer Science+Business Media, LLC
Physics; Theoretical, Mathematical and Computational Physics; Classical and Quantum Gravitation, Relativity Theory; Differential Geometry; Astronomy, Astrophysics and Cosmology; Quantum Physics
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