Accelerated Universe from Modified Chaplygin Gas and Tachyonic Fluid

Abstract

A cosmological model with an exotic fluid is investigated. We show that the equation of state of this ``modified Chaplygin'' gas can describe the current accelerated expansion of the universe. We then reexpress it as FRW cosmological model containing a scalar field $\varphi$ and find its self--interacting potential. Moreover motivated by recent works of Sen [sen1, sen2] and Padmanbhan [pad] on tachyon field theory, a map for this exotic fluid as a normal scalar field $\varphi$ with Lagrangian ${\mathcal{L}}_{\varphi }=\frac{{\dot{\varphi }}^2}{2}-U(\varphi )$ to the tachyonic field $T$ with Lagrangian ${\mathcal{L}}_T=-V(T)\sqrt{1-{\dot{T}}^2}$ is obtained.

11 pages, no figures

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