Mutually interacting tachyon dark energy with variable G and Λ  

作　　者：Jafar Sadeghi Martiros Khurshudyan Margarit Hakobyan Hoda Farahani 

机构地区：[1]Department of Physics, Faculty of Basic Sciences, University of Mazandaran [2]Max Planck Institute of Colloids and Interfaces,Potsdam-Golm Science Park Am Mhlenberg 1 OT Golm 14476 Potsdam, Germany [3]A.I. Alikhanyan National Science Laboratory,Alikhanian Brothers St., Yerevan, Armenia [4]Department of Nuclear Physics, Yerevan State University

出　　处：《Research in Astronomy and Astrophysics》2015年第2期175-190,共16页天文和天体物理学研究（英文版）

基　　金：supported by EU funds in the frame of the program FP7-Marie Curie Initial Training Network INDEX NO. 289968

摘　　要：We consider a tachyonic scalar field as a model of dark energy with interac- tion between components in the case of variable G and A. We assume a fiat Universe with a specific form of scale factor and study cosmological parameters numerically and graphically. Statefinder analysis is also performed. For a particular choice of in- teraction parameters we succeed in obtaining an analytical expression of densities. We find that our model will be stable at the late stage but there is an instability in the early Universe, so we propose this model as a realistic model of our Universe.We consider a tachyonic scalar field as a model of dark energy with interac- tion between components in the case of variable G and A. We assume a fiat Universe with a specific form of scale factor and study cosmological parameters numerically and graphically. Statefinder analysis is also performed. For a particular choice of in- teraction parameters we succeed in obtaining an analytical expression of densities. We find that our model will be stable at the late stage but there is an instability in the early Universe, so we propose this model as a realistic model of our Universe.

关 键 词：cosmology—early universe—cosmological parameters—dark energy 

分 类 号：P159[天文地球—天文学]