Constraints on the generalized Chaplygin gas from supernovae observations

Details Constraints on the generalized Chaplygin gas from supernovae observations Constraints on the generalized Chaplygin gas from supernovae observations

2002-09-24

arxiv.org/abs/astro-ph/0209486v1

Phys.Lett.B555:1,2003

Astronomy and Astrophysics

Astrophysics

Submitted to Phys. Lett. B on August 14, 2002

Scientific paper

10.1016/S0370-2693(03)00038-8

We explore the implications of type Ia supernovae (SNIa) observations on flat cosmological models whose matter content is an exotic fluid with equation of state, p=-M^(4(a+1))/rho^a. In this scenario, a single fluid component may drive the Universe from a nonrelativistic matter dominated phase to an accelerated expansion phase behaving, first, like dark matter and in a more recent epoch as dark energy. We show that these models are consistent with current SNIa data for a rather broad range of parameters. However, future SNIa experiments will place stringent constraints on these models, and could safely rule out the special case of a Chaplygin gas (a=1) if the Universe is dominated by a true cosmological constant.

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