Tachyonic matter cosmology with exponential and hyperbolic potentials

摘要

In this paper, we consider tachyonic matter in spatially flat Friedmann-RobertsonWalker (FRW) universe, and obtain behavior of some important cosmological parameters for two special cases of potentials. First, we assume the exponential potential and then consider hyperbolic cosine type potential. In both cases, we obtain behavior of the Hubble, deceleration and EoS parameters. Comparison with observational data suggest the model with hyperbolic cosine type scalar field potentials has good model to describe universe.