Cosmological solutions for model with a $1/H^2$ term

Abstract

We drive the cosmological solutions of five-dimensional model with $1/H^2$ term $(H^2\equiv H_{MNPQ}{H}^{MNPQ})$, where $H_{MNPQ}$ is 4-form field strength. The behaviors of the scale factors and the scalar potential in effective theory are examined.As a consequence, we show that the universe changes from decelerated expansion to accelerated expansion in Einstein frame of the four-dimensional theory.

Comments: 10 pages, 2 figures, version to appear in JCAP