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Using a new method called the statefinder diagnostics which can make one dark energy model differ from the others, we investigate the dynamics of Born-Infeld (B-I) type dark energy model. The evolution trajectory of B-I type dark energy with Mexican hat potential model with respect to e-folding time N is shown in the r(s) diagram. When the parameter of noncanonical kinetic energy term η 0 or kinetic energy φ 2 0, the B-I type dark energy (K-essence) model reduces to the quintessence model or the ΛCDM model corresponding to the statefinder pair r,s 1,0 respectively. As a result, the evolution trajectory of our model in the r(s) diagram in Mexican hat potential is quite different from those of other dark energy models. The current values of parameters Ω φ and ω φ in this model meet the latest observations WMAP5 well. © 2008 Chinese Physical Society and IOP Publishing Ltd.

Statefinder Diagnostic for Born—Infeld Type Dark Energy Model