Abstract
In this paper we have considered a model of the universe filled with Generalized Cosmic Chaplygin Gas and another fluid with barotropic equation of state. We observe its role in accelerating phase of the universe by considering the mixture of these two fluid models valid from the radiation era to ΛCDM for γ −≤ ≤ 11 and the radiation era to quintessence model for γ <− 1 . The statefinder parameters describe the evolution of the universe in different phases for these two fluid models.
Highlights
Recent cosmological measurements obtained by SNe Ia [1] [2], WMAP [3], SDSS [4] and X-ray [5] [6] indicate that our universe is expanding and the expansion of the universe is accelerating
We consider two fluid cosmological model containing a component of Generalized Cosmic Chaplygin gas, with equation of state (5) and a component of barotropic fluid with equation of state p1 = γρ1 . ω satisfies −1 ≤ ω ≤ 1 for accelerating universe normally
The pair of parameters (r, s) called statefinder parameters distinguish between different types of dark energy
Summary
Recent cosmological measurements obtained by SNe Ia [1] [2], WMAP [3], SDSS [4] and X-ray [5] [6] indicate that our universe is expanding and the expansion of the universe is accelerating. Cosmological constant is the simplest model of dark energy corresponding to the ΛCDM model. The other dark energy models are quintessence [7], phantom [8], tachyon [9], holographic dark energy [10] [11], K-essence [12] and Chaplygin gas models with various equation of state. (2016) Universe Filled with Generalized Cosmic Chaplygin Gas and Barotropic Fluid. Debnath et al [22] has obtained the acceleration of the universe containing the modified Chaplygin gas and barotropic fluid. In this paper we try to observe the state of the universe by using Generalized Cosmic Chaplygin gas and barotropic fluid and obtain the values of the statefinder parameters
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