scholarly journals Thermodynamics of Modified Chaplygin Gas and Tachyonic Field

2011 ◽  
Vol 51 (2) ◽  
pp. 565-576 ◽  
Author(s):  
Samarpita Bhattacharya ◽  
Ujjal Debnath
Keyword(s):  
Chaplygin Gas ◽  
Modified Chaplygin Gas ◽  
Tachyonic Field

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 GENERALIZED SECOND LAW OF THERMODYNAMICS IN THE PRESENCE OF INTERACTING DBI-ESSENCE AND OTHER DARK ENERGIES

2010 ◽  
Vol 25 (30) ◽  
pp. 5557-5566 ◽  
Author(s):  
SURAJIT CHATTOPADHYAY ◽  
UJJAL DEBNATH
Keyword(s):  
Dark Energy ◽  
Event Horizon ◽  
Second Law Of Thermodynamics ◽  
Chaplygin Gas ◽  
Second Law ◽  
Modified Chaplygin Gas ◽  
Tachyonic Field ◽  
New Agegraphic Dark Energy ◽  
Generalized Second Law ◽  
Increasing Function

In the present work we investigated the validity of the generalized second law (GSL) of thermodynamics in the presence of interaction between DBI-essence and other four candidates of dark energy, namely the modified Chaplygin gas, hessence, tachyonic field and new agegraphic dark energy. It has been observed that the GSL breaks down in the presence of the interactions. However, the event horizon remains to be an increasing function of time.

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

Effect of modified Chaplygin gas in anisotropic universe

2009 ◽  
Vol 321 (1) ◽  
pp. 53-56 ◽  
Author(s):  
Shuvendu Chakraborty ◽  
Ujjal Debnath
Keyword(s):  
Chaplygin Gas ◽  
Anisotropic Universe ◽  
Modified Chaplygin Gas
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