Cheng-Weyl Vector Field and its Cosmological Application

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dc.creatorWei, Hao
dc.creatorCai, Rong-Gen
dc.date2006-07-05
dc.date2007-09-18
dc.date.accessioned2026-07-07T11:25:46Z
dc.date.available2026-07-07T11:25:46Z
dc.descriptionWeyl'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.
dc.description16 pages, revtex4; v2: references added; v3: discussions added, to appear in JCAP; v4: published version
dc.identifierhttps://arxiv.org/abs/astro-ph/0607064
dc.identifierhttp://arxiv.org/abs/astro-ph/0607064
dc.identifierJCAP0709:015,2007
dc.identifierdoi:10.1088/1475-7516/2007/09/015
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/195611
dc.subjectAstrophysics
dc.subjectGeneral Relativity and Quantum Cosmology
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectHigh Energy Physics - Theory
dc.titleCheng-Weyl Vector Field and its Cosmological Application
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