Tachyon dark energy models: dynamics and constraints

Calcagni, Gianluca and Liddle, Andrew R (2006) Tachyon dark energy models: dynamics and constraints. Physical Review D, 74 (4). 0435281-04352810. ISSN 0556-2821

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Abstract

We explore the dynamics of dark energy models based on a Dirac-Born-Infeld (DBI) tachyonic action, studying a range of potentials. We numerically investigate the existence of tracking behavior and determine the present-day value of the equation of state parameter and its running, which are compared with observational bounds. We find that tachyon models have quite similar phenomenology to canonical quintessence models. While some potentials can be selected amongst many possibilities and fine-tuned to give viable scenarios, there is no apparent advantage in choosing a DBI scalar field instead of a Klein-Gordon one.

Item Type: Article
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Depositing User: Andrew Liddle
Date Deposited: 06 Feb 2012 18:43
Last Modified: 06 Aug 2019 13:15
URI: http://sro.sussex.ac.uk/id/eprint/17944

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