https://doi.org/10.1140/epjc/s10052-017-5255-1
Regular Article - Theoretical Physics
Dynamics of coupled phantom and tachyon fields
1
Institute for Advanced Physics and Mathematics, Zhejiang University of Technology, Hangzhou, China
2
School of Physics, Shandong University, Jinan, China
3
Department of General and Theoretical Physics, Eurasian International Center for Theoretical Physics, Eurasian National University, Astana, Kazakhstan
4
Department of Physics, GCAP-CASPER, Baylor University, Waco, TX, USA
* e-mail: shahalam@zjut.edu.cn
Received:
26
May
2017
Accepted:
24
September
2017
Published online:
17
October
2017
In this paper, we apply the dynamical analysis to a coupled phantom field with scaling potential taking particular forms of the coupling (linear and combination of linear), and present phase space analysis. We investigate if there exists a late time accelerated scaling attractor that has the ratio of dark energy and dark matter densities of the order one. We observe that the scrutinized couplings cannot alleviate the coincidence problem, however, they acquire stable late time accelerated solutions. We also discuss a coupled tachyon field with inverse square potential assuming linear coupling.
© The Author(s), 2017
