Cosmology with a Nonlinear Born-Infeld type Scalar Field

Abstract

Recent many physicists suggest that the dark energy in the universe might result from the Born-Infeld(B-I) type scalar field of string theory. The universe of B-I type scalar field with potential can undergo a phase of accelerating expansion. The corresponding equation of state parameter lies in the range of $-1<\omega <-1/3$. The equation of state parameter of B-I type scalar field without potential lies in the range of $0\le \omega \le 1$. We find that weak energy condition and strong energy condition are violated for phantom B-I type scalar field. The equation of state parameter lies in the range of $\omega <-1$.

10 pages without figures

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