Relativity and Cosmology


Variable Chaplygin Gas in Kaluza-Klein Framework

Authors: M. Salti, O. Aydogdu, A. Tas, K. Sogut, E. E. Kangal

We investigate cosmological features of the variable Chaplygin gas (VCG) describing a unified dark matter-energy scenario in a universe governed by the five dimensional (5D) Kaluza-Klein (KK) gravity. In such a proposal, the VCG evolves as from the dust-like phase to the phantom or the quintessence phases. It is concluded that the background evolution for the KK type VCG definition is equivalent to that for the dark energy interacting with the dark matter. Next, after performing neo-classical tests, we calculated the proper, luminosity and angular diameter distances. Additionally, we construct a connection between the VCG in the KK universe and a homogenous minimally coupled scalar field by introducing its self-interacting potential and also we confirm the stability of the KK type VCG model by making use of thermodynamics. Moreover, we use data from Type Ia Supernova (SN Ia), observational H(z) dataset (OHD) and Planck-2015 results to place constraints on the model parameters. Subsequently, according to the best-fit values of the model parameters we analyze our results numerically.

Comments: 9 Pages. Can. J. Phys. 97: 117–124 (2019)

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[v1] 2019-10-17 04:36:03

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