Interacting Quintessence in a New Scalar-Torsion Gravity

Abstract

In the framework of teleparallel equivalent of general relativity, we study a gravity theory where a scalar field beyond its minimal coupling, is also coupled with the vector torsion through a non-minimal derivative coupling. After a suitable choice of auxiliary variables that allows us to perform the phase-space analysis of the model we obtain the critical points and their stability. While there is no scaling attractor in non-interacting scenario, by considering an interaction between dark energy and dark matter, we find scaling attractors in which the fractional densities of dark energy and matter are non-vanishing constants over there. The universe can evolve to these scaling attractors regardless of initial conditions and the cosmological coincidence problem could be alleviated without fine-tunings.

15 pages, 6 figures. New references have been added

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Cited by in corpus (8)

• Constraining f(T) teleparallel gravity by Big Bang Nucleosynthesis
• $f(T)$ gravitational baryogenesis
• Updated constraints on $f(T)$ models using direct and indirect measurements of the Hubble parameter
• Dynamics of coupled phantom and tachyon fields
• Scalar-Tensor Teleparallel Gravity With Boundary Term by Noether Symmetries
• PeV IceCube signals and Dark Matter relic abundance in modified cosmologies
• Late time evolution of a nonminimally coupled scalar field system
• Parameterized post Newtonian approximation in a teleparallel model of dark energy with a boundary term