Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2006-06-05
Int.J.Mod.Phys.A22:2173-2195,2007
Physics
High Energy Physics
High Energy Physics - Theory
18 pages, 18 figures, some references added, revised version for Int.J.Mod.Phys.A, appeared in Int.J.Mod.Phys.A
Scientific paper
10.1142/S0217751X07036750
The cosmological evolution in Nonlinear Born-Infeld(hereafter NLBI) scalar field theory with negative potentials was investigated. The cosmological solutions in some important evolutive epoches were obtained. The different evolutional behaviors between NLBI and linear(canonical) scalar field theory have been presented. A notable characteristic is that NLBI scalar field behaves as ordinary matter nearly the singularity while the linear scalar field behaves as "stiff" matter. We find that in order to accommodate current observational accelerating expanding universe the value of potential parameters $|m|$ and $|V_0|$ must have an {\it upper bound}. We compare different cosmological evolutions for different potential parameters $m, V_0$.
Fang Wei
Huang Zeng-Guang
Lu Hui-Qing
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