Astrophysics, abstract
astro-ph/0509328

From: Hao Wei [view email]

Date (v1): Tue, 13 Sep 2005 12:57:58 GMT (16kb)
Date (revised v2): Sun, 18 Sep 2005 12:24:55 GMT (16kb)
Date (revised v3): Wed, 14 Dec 2005 03:22:22 GMT (16kb)

Cosmological Evolution of Hessence Dark Energy and Avoidance of the Big Rip

Authors: Hao Wei, Rong-Gen Cai

Comments: 15 pages, 8 tables, revtex4; v2: references added; v3: published version

Journal-ref: Phys. Rev. D 72, 123507 (2005)

DOI: 10.1103/PhysRevD.72.123507

Recently, many dark energy models whose equation-of-state parameter can cross the phantom divide $w_{de}=-1$ have been proposed. In a previous paper [Class. Quant. Grav. {\bf 22}, 3189 (2005); hep-th/0501160], we suggest such a model named hessence, in which a non-canonical 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 hessnece 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.

http://arxiv.org/abs/astro-ph/0509328