http://arxiv.org/abs/1501.06960
We find a method to rewrite the equations of motion of scalar fields, DBI field and quintessence, in the autonomous form for\emph{arbitrary} scalar potentials. With the aid of this method, we explore the cosmic evolution of DBI field and quintessence with the potential of multiple vacua. Then we find that the scalars are always frozen in the false or true vacuum in the end. Compared to the evolution of quintessence, the DBI field has more times of oscillations around the vacuum of the potential. The reason for this point is that, with the increasing of speed $\dot{\phi}$, the friction term of DBI field is greatly decreased. Thus the DBI field acquires more times of oscillations.
C. Gao and Y. Shen
Thu, 29 Jan 15
38/49
Comments: 8 pages, 9 figures
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