Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-07-05
JCAP0709:015,2007
Astronomy and Astrophysics
Astrophysics
16 pages, revtex4; v2: references added; v3: discussions added, to appear in JCAP; v4: published version
Scientific paper
10.1088/1475-7516/2007/09/015
Weyl's idea on scale invariance was resurrected by Cheng in 1988. The requirement of local scale invariance leads to a completely new vector field, which we call the ``Cheng-Weyl vector field''. The Cheng-Weyl vector field couples only to a scalar field and the gravitational field naturally. It does not interact with other known matters in the standard model of particle physics. In the present work, the (generalized) Cheng-Weyl vector field coupled with the scalar field and its cosmological application are investigated. A mixture of the scalar field and a so-called ``cosmic triad'' of three mutually orthogonal Cheng-Weyl vector fields is regarded as the dark energy in the universe. The cosmological evolution of this ``mixed'' dark energy model is studied. We find that the effective equation-of-state parameter of the dark energy can cross the phantom divide $w_{de}=-1$ in some cases; the first and second cosmological coincidence problems can be alleviated at the same time in this model.
Cai Rong-Gen
Wei Hao
No associations
LandOfFree
Cheng-Weyl Vector Field and its Cosmological Application does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Cheng-Weyl Vector Field and its Cosmological Application, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Cheng-Weyl Vector Field and its Cosmological Application will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-450809