Soft coincidence in late acceleration

Sergio Del Campo; Ramón Herrera; Diego Pavón

doi:https://doi.org/10.1103/PhysRevD.71.123529

Soft coincidence in late acceleration

Sergio Del Campo, Ramón Herrera, Diego Pavón

Department of Physics

Research output: Contribution to journal › Article › Research › peer-review

27 Citations (Scopus)

Abstract

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. © 2005 The American Physical Society.

Original language	English
Article number	123529
Journal	Physical Review D - Particles, Fields, Gravitation and Cosmology
Volume	71
DOIs	https://doi.org/10.1103/PhysRevD.71.123529
Publication status	Published - 15 Jun 2005

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title = "Soft coincidence in late acceleration",

abstract = "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. {\textcopyright} 2005 The American Physical Society.",

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AB - 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. © 2005 The American Physical Society.

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