Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-10-26
Astronomy and Astrophysics
Astrophysics
5 pages, 11 *.eps figures, revtex4 style
Scientific paper
The Hubble diagram (HD) of Gamma-Ray Bursts (GRBs) having properly estimated redshifts is compared with the predicted one for the Chaplygin gas (CG), a dark energy candidate. The CG cosmology and that of Friedmann and $\Lambda$-CDM models are studied and confronted to the GRBs observations. The model-to-sample $\chi^2$ statistical analysis indicates the CG model as the best fit. The present GRBs HD plot exhibits a marked trend: as one goes back in time, it gets much closer to the predict HD for a Friedmann universe. This clear trend conclusively demonstrates that a transition from decelerate to accelerate expansion did take place. However, contrarily to claims based on supernovae type Ia, the transition redshift lies somewhere between $\sim 2.5 < z \simeq 3.5$ rather than at $z \sim 0.5-1$. All of these striking features of the GRBs HD constitute the most robust demonstration that the Chaplygin gas can in fact be the universe's driving dark energy field.
Habib Dumet M.
Bonilla Quintero Carlos A.
Furlanetto Cristina
Morais Jefferson
Mosquera Cuesta Herman J.
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