Chaplygin Gas Dark Energy Models Research Articles

Reconstruction of f(G) gravity with polytropic and Chaplygin gas dark energy models

We consider the modified Gauss-Bonnet gravity and reconstruct this theory from some dark energy scenarios such as the polytropic, generalized Chaplygin and modified Chaplygin gas models. We perform a numerical analysis with the best fit values from the observational data for the model parameters space and find that the reconstructed models lead to an effective quintessence acceleration phase. Furthermore, we investigate the stability of the calculated models through the squared speed of sound parameter.

Logarithmic-corrected Ricci and modified Chaplygin gas dark energy models in fractal framework

Making use of the quantum theory of gravity in fractal geometry (FG) and considering a flat Friedmann-Robertson-Walker (FRW)-type universe containing dark matter interacting with dark energy, we investigate how the quantum and fractal contributions affect the dynamics of logarithmic-corrected Ricci dark energy (LCRDE) and modified Chaplygin gas (MCG).

Loop quantum effects on Om diagnostic and their cosmological implications

In this paper we study the loop quantum effects on the Om diagnostic and subsequently on the universe. We reconstruct the Om diagnostic in the background of loop quantum gravity and then study the behaviour of various Chaplygin gas dark energy models, using the modified diagnostic in a comparative scenario. The trajectories discriminate the various dark energy models from each other both in Einstein gravity as well as loop quantum gravity. The loop quantum effects are also clearly noticeable from the trajectories in the past, present, and future universe. We see that the loop quantum deviations are highly pronounced in the early universe but alleviates as we tend towards the present universe and continue to decay in the future. This raises a big question on the effectiveness and consequently the suitability of loop quantum cosmology to explain the future universe.

Holographic dark energy model with linearly varying deceleration parameter and generalised Chaplygin gas dark energy model in Bianchi type-I universe

The paper deals with a spatially homogeneous and anisotropic Bianchi type-I universe filled with two minimally interacting fluids; matter and holographic dark energy components. The nature of the holographic dark energy for Bianchi type-I space time is discussed. An exact solution to Einstein’s field equations in Bianchi type-I line element is obtained using the assumption of linearly varying deceleration parameter. Under the suitable condition, it is observed that the anisotropy parameter of the universe approaches to zero for large cosmic time and the coincidence parameter increases with increasing time. We established a correspondence between the holographic dark energy models with the generalised Chaplygin gas dark energy model. We also reconstructed the potential and dynamics of the scalar field which describes the Chaplygin cosmology. Solution of the field equations shows that a big rip type future singularity will occur for this model. It has been observed that the solutions are compatible with the results of recent observations.

Rip Singularity Scenario and Bouncing Universe in a Chaplygin Gas Dark Energy Model

We choose a modified Chaplygin Gas Dark energy model for considering some its cosmological behaviors. In this regards, we study different Rip singularity scenarios and bouncing model of the universe in context of this model. We show that by using suitable parameters can explain some cosmological aspects of the model.

AGEGRAPHIC CHAPLYGIN GAS MODEL OF DARK ENERGY

We establish a connection between the agegraphic models of dark energy and Chaplygin gas energy density in a nonflat universe. We reconstruct the potential of the agegraphic scalar field as well as the dynamics of the scalar field according to the evolution of the agegraphic dark energy. We also extend our study to the interacting agegraphic generalized Chaplygin gas dark energy model.