FRW type of cosmology with a Chaplygin gas
Abstract
The evolution of a universe modelled as a mixture of generalised Chaplygin gas and ordinary matter field is studied for a Robertson Walker type of spacetime. This model could interpolate periods of a radiation dominated, matter dominated and a cosmological constant dominated universe. Depending on the arbitrary constants appearing in our theory the instant of flip changes. Interestingly we also get a bouncing model when the signature of one of the constants changes. The velocity of sound may become imaginary under certain situations pointing to a perturbative state and consequently the possibility of structure formation. We also discuss the whole situation in the backdrop of wellknown Raychaudhury equation and a comparison is made with the previous results.
Cite
@article{arxiv.1205.3768,
title = {FRW type of cosmology with a Chaplygin gas},
author = {D. Panigrahi and S. Chatterjee},
journal= {arXiv preprint arXiv:1205.3768},
year = {2017}
}
Comments
22 Pages, 20 figures