Interacting quintessence in a new scalar-torsion gravity

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• 作者：Behnaz Fazlpour
• 关键词：Teleparallel gravity ; Non ; minimal coupling ; Dark energy ; Dark matter interaction
• 刊名：General Relativity and Gravitation
• 出版年：2016
• 出版时间：December 2016
• 年：2016
• 卷：48
• 期：12
• 全文大小：784 KB
• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Mathematical and Computational Physics
  Relativity and Cosmology
  Differential Geometry
  Quantum Physics
  Astronomy, Astrophysics and Cosmology
  
• 出版者：Springer Netherlands
• ISSN：1572-9532
• 卷排序：48

文摘

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 to 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 the 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.