Riemann Problem in Generalized Chaplygin Gas

2021 ◽  
pp. 107-117
Author(s):  
Mustafa Rahman ◽  
Mohd Junaid Siddiqui ◽  
Azhar Iqbal ◽  
Amjad A. Pasha
Keyword(s):  
Riemann Problem ◽  
Chaplygin Gas ◽  
Generalized Chaplygin Gas

scholarly journals Large scale structure and the generalized Chaplygin gas as dark energy

2004 ◽  
Vol 69 (2) ◽  
Author(s):  
Tuomas Multamäki ◽  
Marc Manera ◽  
Enrique Gaztañaga
Keyword(s):  
Dark Energy ◽  
Large Scale ◽  
Large Scale Structure ◽  
Chaplygin Gas ◽  
Scale Structure ◽  
Generalized Chaplygin Gas

scholarly journals OBSERVATIONAL CONSTRAINTS ON THE GENERALIZED CHAPLYGIN GAS

2009 ◽  
Vol 18 (13) ◽  
pp. 2007-2022 ◽  
Author(s):  
SERGIO DEL CAMPO ◽  
J. R. VILLANUEVA
Keyword(s):  
Dark Energy ◽  
Cosmological Model ◽  
Chaplygin Gas ◽  
Observational Constraints ◽  
Energy Component ◽  
Generalized Chaplygin Gas ◽  
Astronomical Data ◽  
Astronomical Observations ◽  
Dark Energy Component ◽  
Two Parameters

In this paper we study a quintessence cosmological model in which the dark energy component is considered to be the generalized Chaplygin gas and the curvature of the three-geometry is taken into account. Two parameters characterize this sort of fluid: ν and α. We use different astronomical data for restricting these parameters. It is shown that the constraint ν ≲ α agrees well enough with the astronomical observations.

scholarly journals On the thermodynamic stability of the generalized Chaplygin gas

2006 ◽  
Vol 636 (2) ◽  
pp. 86-90 ◽  
Author(s):  
F.C. Santos ◽  
M.L. Bedran ◽  
V. Soares
Keyword(s):  
Thermodynamic Stability ◽  
Chaplygin Gas ◽  
Generalized Chaplygin Gas

scholarly journals DARK MATTER TO DARK ENERGY TRANSITION IN k-ESSENCE COSMOLOGIES

2005 ◽  
Vol 20 (27) ◽  
pp. 2075-2082 ◽  
Author(s):  
L. P. CHIMENTO ◽  
MÓNICA FORTE ◽  
RUTH LAZKOZ
Keyword(s):  
Dark Matter ◽  
Dark Energy ◽  
Kinetic Energy ◽  
Speed Of Sound ◽  
Energy Transition ◽  
Chaplygin Gas ◽  
Large Set ◽  
Generalized Chaplygin Gas ◽  
General Terms ◽  
Transient Models

We implement the transition from dark matter to dark energy in k-essence cosmologies for a very large set of kinetic functions F, in a way alternative to recent proposals which use generalized Chaplygin gas and transient models. Here we require that the pressure admits a power-law expansion around some value of the kinetic energy where the pressure vanishes. In addition, for suitable values of the parameters of the model, the speed of sound of the dark matter will be low. We first present the discussion in fairly general terms, and later consider for illustration two examples.

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