Dynamical Compactification, Standard Cosmology and the Accelerating Universe

Details Dynamical Compactification, Standard Cosmology and the Accelerating Universe Dynamical Compactification, Standard Cosmology and the Accelerating Universe

2002-02-19

arxiv.org/abs/hep-th/0202119v1

Phys.Rev. D65 (2002) 104018

Physics

High Energy Physics

High Energy Physics - Theory

11 pages, uses revtex

Scientific paper

10.1103/PhysRevD.65.104018

A cosmological model based on Kaluza-Klein theory is studied. A metric, in which the scale factor of the compact space evolves as an inverse power of the radius of the observable universe, is constructed. The Freedmann-Robertson-Walker equations of standard four-dimensional cosmology are obtained precisely. The pressure in our universe is an effective pressure expressed in terms of the components of the higher dimensional energy-momentum tensor. In particular, this effective pressure could be negative and might therefore explain the acceleration of our present universe. A special feature of this model is that, for a suitable choice of the parameters of the metric, the higher dimensional gravitational coupling constant could be negative.

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