Non-minimally Coupled Tachyon Field in Teleparallel Gravity

Abstract

We perform a full investigation on dynamics of a new dark energy model in which the four-derivative of a non-canonical scalar field (tachyon) is non-minimally coupled to the vector torsion. Our analysis is done in the framework of teleparallel equivalent of general relativity which is based on torsion instead of curvature. We show that in our model there exists a late-time scaling attractor (point $P_4$), corresponding to an accelerating universe with the property that dark energy and dark matter densities are of the same order. Such a point can help to alleviate the cosmological coincidence problem. Existence of this point is the most significant difference between our model and another model in which a canonical scalar field (quintessence) is used instead of tachyon field.

15 pages, 6 figures

References in corpus (16)

• Dynamics of dark energy
• Dark energy cosmology: the equivalent description via different theoretical models and cosmography tests
• Dark Energy and the Accelerating Universe
• Dark torsion as the cosmic speed-up
• Einstein's Other Gravity and the Acceleration of the Universe
• Reconstructing Dark Energy
• Generalizations of teleparallel gravity and local Lorentz symmetry
• Static Solutions with Spherical Symmetry in f(T) Theories
• Quintessence: a mini-review
• Torsion Cosmology and the Accelerating Universe
• Extended Quintessence with non-minimally coupled phantom scalar field
• Tachyon Field in Intermediate Inflation
• Non-minimally coupled scalar field cosmology on the phase plane
• Halos of Unified Dark Matter Scalar Field
• Detectable primordial non-gaussianities and gravitational waves in k-inflation
• Lorentz Connections and Gravitation