Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-09-29
Phys.Rev. D70 (2004) 121304
Astronomy and Astrophysics
Astrophysics
5 pages, 2 figures
Scientific paper
10.1103/PhysRevD.70.121304
In the past few years, the Chaplygin gas (CG) has been considered as an appealing candidate for unifying dark matter and dark energy into a single substance. This picture had to face several problems when trying to fit its predictions with cosmological observations. We point out another potential problem of this model, showing that, when the CG is described through a classical scalar field, the corresponding trajectories are strongly unstable. This implies that an extreme fine tuning must apply to the initial values of the field in order to end up today with values allowed by observational data.
Matarrese Sabino
Perrotta Francesca
Torki Mehri
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