Cosmology with a Nonlinear Born-Infeld type Scalar Field

TL;DR

This paper explores the cosmological implications of a nonlinear Born-Infeld scalar field, showing its potential to explain dark energy and cosmic acceleration, with specific focus on its equation of state and energy conditions.

Contribution

It introduces a detailed analysis of B-I type scalar fields with and without potential in cosmology, highlighting their role in accelerating universe models and energy condition violations.

Findings

B-I scalar field with potential can cause accelerated expansion.

Equation of state parameter ranges between -1 and -1/3 for potential case.

Phantom B-I scalar field violates weak and strong energy conditions.

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 $\displaystyle -1<\omega<-{1/3}$. The equation of state parameter of B-I type scalar field without potential lies in the range of $0\leq\omega\leq1$. 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 $\omega<-1$.