Regular Article - Theoretical Physics
An extended analysis for a generalized Chaplygin gas model
Department of Physics, Vivekananda Satavarshiki Mahavidyalaya (Affiliated to the Vidyasagar University), 721513, Manikpara, West Bengal, India
2 Institute of Systems Science, Durban University of Technology, PO Box 1334, 4000, Durban, Republic of South Africa
3 Instituto de Ciencias Físicas y Matemáticas, Universidad Austral de Chile, 5090000, Valdivia, Chile
4 Department of Mathematics, Panihati Mahavidyalaya, 700110, Kolkata, West Bengal, India
Accepted: 6 March 2022
Published online: 18 March 2022
In this work, we have extended the analysis on the generalized Chaplygin gas (GCG) model as the unification of dark energy and dark matter. Specifically, we have shown that the model of our consideration known as the new generalized Chaplygin gas (NGCG) model, admits a scalar field description, which means that there exist a minimally coupled scalar field for a given scalar field potential where the equation of state is that of the NGCG. With the use of the later property we can construct the slow-roll parameters and derive the corresponding values for the spectral indices for the tensor to scalar perturbation and for the density perturbations. We have also studied the growth rate of matter perturbations in the NGCG scenario. Finally, we have studied the viability of the generalized second law of thermodynamics by assuming that the dynamical apparent horizon in a NGCG universe is endowed with Hawking temperature and Bekenstein entropy.
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