Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-06-21
Phys.Rev.D71:123529,2005
Astronomy and Astrophysics
Astrophysics
27 pages, 10 eps figures, to be published in Physical Review D
Scientific paper
10.1103/PhysRevD.71.123529
We study the coincidence problem of late cosmic acceleration by assuming that the present ratio between dark matter and dark energy is a slowly varying function of the scale factor. As dark energy component we consider two different candidates, first a quintessence scalar field, and then a tachyon field. In either cases analytical solutions for the scale factor, the field and the potential are derived. Both models show a good fit to the recent magnitude-redshift supernovae data. However, the likelihood contours disfavor the tachyon field model as it seems to prefer a excessively high value for the matter component.
del Campo Sergio
Herrera Ramon
Pavon Diego
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