Bounce and collapse in the slotheonic universe

摘要

In this paper, we examine the cosmological dynamics of a slotheon field in a linear potential. The slotheon correction term G mu nu / 2M(2) pi; mu pi;nu; respects the galileon symmetry in curved spacetime. We demonstrate the future evolution of universe in this model. We show that in this scenario, the universe ends with the Big Crunch singularity like the standard case. The difference being that the time at which the singularity occurs is delayed in the slotheon gravity. The delay crucially depends upon the strength of slotheon correction. We use observational data from Type Ia Supernovae, Baryon Acoustic Oscillations, and H(z) measurements to constrain the parameters of the model for a viable cosmology, providing the corresponding likelihood contours.