2014/04/30 by Georgios Kofinas, Genly Leon, Emmanuel N. Saridakis · 1 citation
Physics and Astronomy · #gr-qc #astro-ph.CO #hep-th
paper · pdf · doi:10.1088/0264-9381/31/17/175011
published as Class. Quantum Grav. 31 (2014) 175011 · 23 pages, 6 figures, matches the version published in CQG
arxiv created 2014/08/16 · arxiv updated 2014/08/19
The f(T,TG) class of gravitational modification, based on the quadratic torsion scalar T, as well as on the new quartic torsion scalar TG which is the teleparallel equivalent of the Gauss-Bonnet term, is a novel theory, different from both f(T) and f(R,G) ones. We perform a detailed dynamical analysis of a spatially flat universe governed by the simplest non-trivial model of f(T,TG) gravity which does not introduce a new mass scale. We find that the universe can result in dark-energy dominated, quintessence-like, cosmological-constant-like or phantom-like solutions, according to the parameter choices. Additionally, it may result to a dark energy - dark matter scaling solution, and thus it can alleviate the coincidence problem. Finally, the analysis "at infinity" reveals that the universe may exhibit future, past, or intermediate singularities depending on the parameters.