Abstract
AbstractConsidering the Panigrahi and Chatterjee model (2017) for variable generalised Chaplygin gas, in this paper we found for this kind of exotic matter an analytic expression for the adiabatic compressibility βs. It was analyzed the behaviour of the adiabatic compressibility in the limit of high and low pressure. The derived equation for βs was used to deduce the value of the heat capacity at constant pressure Cp for variable generalised Chaplygin gas.
Highlights
The discovery of accelerating expansion of the universe (Amanullah et al, 2010; Kamenschick et al, 2001; Reiss et al, 1998) has allowed the opening new horizons in the field of physics and cosmology and the exotic matter model known as Chaplygin gas is one of the most explanations for this phenomena
In this paper an expression has been deduced for the adiabatic compressibility of the variable generalised Chaplygin gas (VGCG) from the equation of state given for Panigrahi and Chatterjee (2017)
With the equation obtained for the adiabatic compressibility we derived an expression for the heat capacity at constant pressure CP in a VGCG model
Summary
The discovery of accelerating expansion of the universe (Amanullah et al, 2010; Kamenschick et al, 2001; Reiss et al, 1998) has allowed the opening new horizons in the field of physics and cosmology and the exotic matter model known as Chaplygin gas is one of the most explanations for this phenomena. The variable Chaplyging gas model was studied for Panigrahi (2015) and Malaver (2016). Panigrahi (2015) demonstrated that this model satisfies the third law of thermodynamics and Malaver (2016) derived an expression for the adiabatic compresibility in a variable Chaplygin gas model. Panigrahi and Chatterjee (2017) propose a variable generalized Chaplygin gas model and deduce some thermodynamic equations in terms of temperature and volume
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