Late time acceleration in a slow moving galileon field

Abstract

In this paper, we examine the cosmological viability of a slow moving galileon field in a potential. The Lagrangian $\mathcal{L}$ $=-\frac{1}{2}{g}^{\mu \nu }{\pi }_{;\mu }{\pi }_{;\nu }+\frac{G^{\mu \nu }}{2M^2}{\pi }_{;\mu }{\pi }_{;\nu }$ respects the galileon symmetry in curved space time. We carry out detailed investigations of the underlying dynamics of this Lagrangian with Einstein-Hilbert term and a potential. We demonstrate that the model can give rise to a viable ghost free late time acceleration of universe. Furthermore we study the cosmological perturbation of the model and see that the model gives different BBN constraints at early times. We also carry out the observational analysis of the model and use observational data from growth, Type Ia Supernovae (SNIa), Baryon Acoustic Oscillations (BAO) and Cosmic Microwave Background (CMB) to constrain the parameters of the theory.

7 pages, 7 figures

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• Viable dark energy models using pseudo-Nambu-Goldstone bosons
• Late-time acceleration in the coupled Cubic Galileon models
• Evolution of Dark Energy Perturbations for Slotheon Field and Power Spectrum
• Hitchhiker's Guide to the Swampland: The Cosmologist's Handbook to the string-theoretical Swampland Programme
• Bounce and Collapse in the Slotheonic Universe