Latest supernova data in the framework of Generalized Chaplygin Gas model

Feb, 2004
8 pages
Published in:
  • Mon.Not.Roy.Astron.Soc. 353 (2004) 329
e-Print:

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Abstract: (arXiv)
We use the most recent Type-Ia Supernova data in order to study the dark energy - dark matter unification approach in the context of the Generalized Chaplygin Gas (GCG) model. Rather surprisingly, we find that data allow models with α>1\alpha > 1. We have studied how the GCG adjusts flat and non-flat models, and our results show that GCG is consistent with flat case upto 68% confidence level. Actually this holds even if one relaxes the flat prior assumption. We have also analysed what one should expect from a future experiment such as SNAP. We find that there is a degeneracy between the GCG model and a XCDM model with a phantom-like dark energy component.