I have a theory: If a theory sounds really cool, then it has to exist. Tachyons fall into that category. Otherwise, how are we ever going to get our starship tachyon drives to go FTL?

Paper: astro-ph/0506482
Date: Tue, 21 Jun 2005 09:44:03 GMT (723kb)

Title: Soft coincidence in late acceleration

Authors: Sergio del campo, Ramon Herrera and Diego Pavon
Comments: 27 pages, 10 eps figures, to be published in Physical Review D
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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.

\\ ( http://arXiv.org/abs/astro-ph/0506482 , 723kb)