PhysRevD.74.043528.pdf (326.99 kB)
Tachyon dark energy models: dynamics and constraints
journal contribution
posted on 2023-06-07, 21:06 authored by Gianluca Calcagni, Andrew R LiddleWe 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.
History
Publication status
- Published
File Version
- Published version
Journal
Physical Review DISSN
0556-2821External DOI
Issue
4Volume
74Page range
0435281-04352810Department affiliated with
- Physics and Astronomy Publications
Full text available
- Yes
Peer reviewed?
- Yes