Cosmological dynamics of tachyonic teleparallel dark energy

Abstract

A detailed dynamical analysis of the tachyonic teleparallel dark energy model, in which a non-canonical scalar field (tachyon field) is non-minimally coupled to gravitation, is performed. It is found that, when the non-minimal coupling is ruled by a dynamically changing coefficient $\alpha \equiv f_{,\varphi }/\sqrt{f}$, with $f(\varphi )$ an arbitrary function of the scalar field $\varphi$, the universe may experience a field-matter-dominated era "$\varphi$MDE", in which it has some portions of the energy density of $\varphi$ in the matter dominated era. This is the most significant difference in relation to the so-called teleparallel dark energy scenario, in which a canonical scalar field (quintessence) is non-minimally coupled to gravitation.

14 pages, 1 figure. arXiv admin note: text overlap with arXiv:1305.0474

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• Noether symmetries and analytical solutions in f(T)-cosmology: A complete study
• Cosmological applications of $F(T,T_G)$ gravity
• New observational constraints on f(T) gravity from cosmic chronometers
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• Updated constraints on $f(T)$ models using direct and indirect measurements of the Hubble parameter
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• Post-Newtonian Approximation of Teleparallel Gravity Coupled with a Scalar Field
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