SO(1,1) dark energy model and the universe transition

Details SO(1,1) dark energy model and the universe transition SO(1,1) dark energy model and the universe transition

2004-05-07

arxiv.org/abs/gr-qc/0405038v3

Class.Quant.Grav. 21 (2004) 5347-5353

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

12 pages. submitted to CQG

Scientific paper

10.1088/0264-9381/21/23/004

We suggest a scalar model of dark energy with the SO(1,1) symmetry. The model may be reformulated in terms of a real scalar field $\Phi$ and the scale factor $a$ so that the Lagrangian may be decomposed as that of the real quintessence model plus the negative coupling energy term of $\Phi$ to $a$. The existence of the coupling term $L^c$ leads to a wider range of $w_{\Phi}$ and overcomes the problem of negative kinetic energy in the phantom universe model. We propose a power-law expansion model of univese with time-dependent power, which can describe the phantom universe and the universe transition from ordinary acceleration to super acceleration.

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