Tachyon dark energy models: dynamics and constraints

Andrew R. Liddle; Gianluca Calcagni

Tachyon dark energy models: dynamics and constraints

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arxiv astro-ph/0606003 v2 pith:EMFPZBJZ submitted 2006-06-01 astro-ph gr-qchep-th

Gianluca Calcagni , Andrew R. Liddle This is my paper

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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 behaviour 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.

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Gravitational memory effects in Tachyon gravity
gr-qc 2025-07 conditional novelty 5.0 of 10

In tachyon gravity, the scalar field adds a breathing memory mode to gravitational waves and modifies the Bondi mass loss and soft theorems.

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