Work

Cosmological evolution of “hessence” dark energy and avoidance of the big rip

Year: 2005

Type: article

Abstract: Recently, many dark energy models whose equation-of-state parameter can cross the phantom divide ${w}_{\mathrm{de}}=\ensuremath{-}1$ have been proposed. In a previous paper [H. Wei, R. G. Cai, and D. F. Zeng, Classical Quantum Gravity 22, 3189 (2005)], we suggest such a model named hessence, in which a noncanonical complex scalar field plays the role of dark energy. In this work, the cosmological evolution of the hessence dark energy is investigated. We consider two cases: one is the hessence field with an exponential potential, and the other is with a (inverse) power-law potential. We separately investigate the dynamical system with four different interaction forms between hessence and background perfect fluid. It is found that the big rip never appears in the hessence model, even in the most general case, beyond particular potentials and interaction forms.

Source: Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields

DOI: 10.1103/physrevd.72.123507

Authors: Hao Wei, Rong-Gen Cai

Institutions: Chinese Academy of Sciences, Institute of Theoretical Physics, University of Chinese Academy of Sciences

Language: English

Topic: Cosmology and Gravitation Theories

Subfield: Astronomy and Astrophysics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

Funders: National Natural Science Foundation of China, Chinese Academy of Sciences, Ministry of Science and Technology of the People's Republic of China

Award: 全息性,暴胀模型和暗能量