Soft coincidence in late acceleration

Sergio Del Campo, Ramón Herrera, Diego Pavón

Research output: Contribution to journalArticlepeer-review

28 Scopus citations


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 the dark energy component we consider two different candidates, first a quintessence scalar field, and then a tachyon field. In either case 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.

Original languageEnglish
Article number123529
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Issue number12
StatePublished - 15 Jun 2005
Externally publishedYes


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