Abstract

A detailed dynamical analysis of the tachyonic teleparallel dark energy model, in which a noncanonical scalar field (tachyon field) is nonminimally coupled to gravitation, is performed. It is found that, when the nonminimal coupling is ruled by a dynamically changing coefficient alpha f(,phi)/root f, with f(phi) an arbitrary function of the scalar field phi, the Universe may experience a field-matter-dominated era "phi MDE," in which it has some portions of the energy density of phi 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 nonminimally coupled to gravitation.