ar X iv : g r - qc / 0 40 30 62 v 1 1 5 M ar 2 00 4 The Chaplygin gas as a model for dark energy
نویسنده
چکیده
We review the essential features of the Chaplygin gas cosmological models and provide some examples of appearance of the Chaplygin gas equation of state in modern physics. A possible theoretical basis for the Chaplygin gas in cosmology is discussed. The relation with scalar field and tachyon cosmological models is also considered.
منابع مشابه
ar X iv : g r - qc / 0 60 60 30 v 1 7 J un 2 00 6 Chaplygin gas in light of recent integrated Sachs – Wolfe effect data
We investigate the possibility of constraining Chaplygin dark energy models with current Integrated Sachs Wolfe effect data. In the case of a flat universe we found that generalized Chaplygin gas models must have an energy density such that Ωc > 0.55 and an equation of state w < −0.6 at 95% c.l.. We also investigate the recently proposed Silent Chaplygin models, constraining Ωc > 0.55 and w < −...
متن کاملar X iv : g r - qc / 0 61 11 31 v 1 2 4 N ov 2 00 6 Remarks on the Generalized Chaplygin Gas
The recent observation of accelerated expansion of the universe, concluded [1] from the study of luminosity of type Ia distant supernova, has put Cosmology in the center stage. Our inability to explain the origin of this expansion has led to the naming of this phenomenon as ”Dark Energy” effect. The coinage obviously matches the other fuzzy area in Cosmology, i.e. the existence of ”Dark Matter”...
متن کاملar X iv : g r - qc / 0 61 11 31 v 2 3 0 N ov 2 00 6 Remarks on the Generalized Chaplygin Gas
The recent observation of accelerated expansion of the universe, concluded [1] from the study of luminosity of type Ia distant supernova, has put Cosmology in the center stage. Our inability to explain the origin of this expansion has led to the naming of this phenomenon as ”Dark Energy” effect. The coinage obviously matches the other fuzzy area in Cosmology, i.e. the existence of ”Dark Matter”...
متن کاملar X iv : g r - qc / 0 40 50 38 v 1 7 M ay 2 00 4 SO ( 1 , 1 ) dark energy model and the universe transition ∗
We suggest a scalar model of dark energy with the SO(1, 1) symmetry. The model may be reformulated in terms of a real scalar field Φ and the scale factor a so that the Lagrangian may be decomposed as that of the real quintessence model plus the negative coupling energy term of Φ to a. The existence of the coupling term Lc leads to a wider range of wΦ and overcomes the problem of negative kineti...
متن کاملar X iv : a st ro - p h / 05 03 36 2 v 1 1 6 M ar 2 00 5 Bulk viscosity driving the acceleration of the Universe
The possibility that the present acceleration of the universe is driven by a kind of viscous fluid is exploited. At background level this model is similar to the generalized Chaplygin gas model (GCGM). But, at perturbative level, the viscous fluid exhibits interesting properties. In particular the oscillations in the power spectrum that plagues the GCGM are not present. Possible fundamental des...
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