Five-dimensional Brans-Dicke theory and cosmic acceleration

Journal Article · Tue Mar 15 04:00:00 EST 2005 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PhysRevD.71.061501· OSTI ID:20706161

Lie, Qiang; Yongge, Ma; Muxin, Han; Dan, Yu ^[1]

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1. Department of Physics, Beijing Normal University, Beijing, 100875 (China)

We consider a 5-dimensional scalar-tensor theory which is a direct generalization of the original 4-dimensional Brans-Dicke theory to five dimensions. By assuming that there is a hypersurface-orthogonal spacelike Killing vector field in the underlying 5-dimensional spacetime, the theory is reduced to a 4-dimensional theory where the 4-metric is coupled with two scalar fields. The cosmological implication of this reduced theory is then studied in the Robertson-Walker model. It turns out that the two scalar fields may account naturally for the present accelerated expansion of our universe. The observational restriction of the reduced cosmological model is also analyzed.

• OSTI ID: 20706161
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 6 Vol. 71; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ACCELERATION
COSMOLOGICAL MODELS
COSMOLOGY
GRAVITATION
MANY-DIMENSIONAL CALCULATIONS
SCALAR FIELDS
SCALARS
SPACE-TIME
TENSORS
UNIVERSE
VECTOR FIELDS