Warm Standard Scalar Field Modified Chaplygin Gas Inflation Inspired by Generalized Dissipative Coefficient on the Brane

2017 ◽  
Vol 68 (2) ◽  
pp. 272 ◽  
Author(s):  
Abdul Jawad ◽  
Faiza Gulshan ◽  
Shamaila Rani
Keyword(s):  
Scalar Field ◽  
Chaplygin Gas ◽  
Modified Chaplygin Gas ◽  
Dissipative Coefficient

Analysis on modified Chaplygin gas as dark energy model

2015 ◽  
Vol 30 (01) ◽  
pp. 1550005 ◽  
Author(s):  
Ya-Bo Wu ◽  
Cheng-Yuan Zhang ◽  
Jian-Bo Lu ◽  
Jun-Wang Lu ◽  
Xue Zhang ◽  
...  
Keyword(s):  
Dark Energy ◽  
Scalar Field ◽  
Chaplygin Gas ◽  
Model Parameters ◽  
Modified Chaplygin Gas ◽  
Related Data ◽  
Om Diagnostic ◽  
Interaction Terms ◽  
Special Cases ◽  
Evolutionary Trajectories

In this paper, we will continue to study the modified Chaplygin gas (MCG) based on Ref. 25. Concretely, we not only discuss both the change rates of the energy densities and the Hubble parameter H(z) as a function of the model parameters, which is compared and consistent with the related data in Ref. 27, but also perform the Om diagnostic in order to geometrically differentiate the MCG model from the ΛCDM, GCG and CG models. Moreover, we plot the evolutionary trajectories of MCG model with different interaction terms in Om planes, and find that the coupling intensity b2 plays an important role in the MCG model. Furthermore, we also reconstruct the potential of MCG scalar field as well as the dynamics of the scalar field according to the evolution of the MCG dark energy. It is worth stressing that the results given by us can include the ones without interaction as the special cases.

scholarly journals Modified Chaplygin Gas Cosmology

2012 ◽  
Vol 2012 ◽  
pp. 1-12 ◽  
Author(s):  
H. B. Benaoum
Keyword(s):  
Scalar Field ◽  
Cosmological Model ◽  
Chaplygin Gas ◽  
Observational Constraints ◽  
Modified Chaplygin Gas ◽  
Tachyonic Field ◽  
The Relationship

Modified Chaplygin gas as an exotic fluid has been introduced by H. B. Benaoum (2002). Essential features of the modified Chaplygin gas as a cosmological model are discussed. Observational constraints on the parameters of the model have been included. The relationship between the modified Chaplygin gas and a homogeneous minimally coupled scalar field is reevaluated by constructing its self-interacting potential. In addition, we study the role of the tachyonic field in the modified Chaplygin gas cosmological model and the mapping between scalar field and tachyonic field is also considered.

scholarly journals Role of a chameleon field in the presence of variable modified Chaplygin gas in Brans–Dicke theory

2012 ◽  
Vol 90 (2) ◽  
pp. 131-135 ◽  
Author(s):  
Shuvendu Chakraborty ◽  
Ujjal Debnath
Keyword(s):  
Scalar Field ◽  
Analytic Function ◽  
Chaplygin Gas ◽  
Conservation Equation ◽  
Modified Chaplygin Gas ◽  
Field Equations ◽  
Variable Modified Chaplygin Gas ◽  
The Universe ◽  
Friedmann Robertson Walker

In this work, we have considered the Friedmann–Robertson–Walker model of the universe for Brans–Dicke (BD) theory with a BD scalar field as a chameleon field. First we have transformed the field equations and conservation equation from Jordan’s frame to Einstein’s frame. We have shown that, in the presence of a variable modified Chaplygin gas (VMCG), the potential function V and another analytic function f always increase with respect to the BD–chameleon scalar field [Formula: see text] but decrease with time t for pure Chaplygin gas, modified Chaplygin gas, and VMCG models.

scholarly journals Chaplygin-gas solutions of f(R) gravity

2016 ◽  
Vol 13 (10) ◽  
pp. 1650120 ◽  
Author(s):  
Maye Elmardi ◽  
Amare Abebe ◽  
Abiy Tekola
Keyword(s):  
Dark Energy ◽  
Scalar Field ◽  
Early Universe ◽  
Equations Of State ◽  
Initial Conditions ◽  
Exact Formula ◽  
Chaplygin Gas ◽  
Cosmic Acceleration ◽  
Late Time ◽  
Modified Chaplygin Gas

We explore exact [Formula: see text] gravity solutions that mimic Chaplygin-gas inspired [Formula: see text]CDM cosmology. Starting with the original, generalized and modified Chaplygin-gas (MCG) equations of state (EoS), we reconstruct the forms of [Formula: see text] Lagrangians. The resulting solutions are generally quadratic in the Ricci scalar, but have appropriate [Formula: see text]CDM solutions in limiting cases. These solutions, given appropriate initial conditions, can be potential candidates for scalar field-driven early universe expansion (inflation) and dark energy-driven late-time cosmic acceleration.

scholarly journals Dynamical system analysis of FLRW models with Modified Chaplygin gas

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Ali Osman Yılmaz ◽  
Ertan Güdekli
Keyword(s):  
Dynamical System ◽  
Equation Of State ◽  
Energy Density ◽  
System Analysis ◽  
Chaplygin Gas ◽  
Modified Chaplygin Gas ◽  
State Spaces ◽  
The Universe ◽  
Matter Energy ◽  
Far Future

AbstractWe investigate Friedmann–Lamaitre–Robertson–Walker (FLRW) models with modified Chaplygin gas and cosmological constant, using dynamical system methods. We assume $$p=(\gamma -1)\mu -\dfrac{A}{\mu ^\alpha }$$ p = ( γ - 1 ) μ - A μ α as equation of state where $$\mu$$ μ is the matter-energy density, p is the pressure, $$\alpha$$ α is a parameter which can take on values $$0<\alpha \le 1$$ 0 < α ≤ 1 as well as A and $$\gamma$$ γ are positive constants. We draw the state spaces and analyze the nature of the singularity at the beginning, as well as the fate of the universe in the far future. In particular, we address the question whether there is a solution which is stable for all the cases.

scholarly journals Reduced modified Chaplygin gas cosmology

2015 ◽  
Vol 2015 (2) ◽  
Author(s):  
Jianbo Lu ◽  
Danhua Geng ◽  
Lixin Xu ◽  
Yabo Wu ◽  
Molin Liu
Keyword(s):  
Chaplygin Gas ◽  
Modified Chaplygin Gas
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