On the generalised Chaplygin gas: worse than a big rip or quieter than a sudden singularity?

Details On the generalised Chaplygin gas: worse than a big rip or quieter than a sudden singularity? On the generalised Chaplygin gas: worse than a big rip or quieter than a sudden singularity?

2007-07-16

arxiv.org/abs/0707.2390v2

Int.J.Mod.Phys.D17:2269-2290,2008

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

19 pages, 6 figures. Discussion expanded and references added. Version to appear in the International Journal of Modern Physic

Scientific paper

10.1142/S0218271808013856

Although it has been believed that the models with generalised Chaplygin gas do not contain singularities, in a previous work we have studied how a big freeze could take place in some kinds of phantom generalised Chaplygin gas. In the present work, we study some types of generalised Chaplygin gas in order to show how different sorts of singularities could appears in such models, in the future or in the past. We point out that: (i) singularities may not be originated from the phantom nature of the fluid, and (ii) if initially the tension of the brane in a brane-world Chaplygin model is large enough then an infrared cut off appears in the past.

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