Gravity-Driven Acceleration of the Cosmic Expansion

Abstract

It is shown here that a dynamical Planck mass can drive the scale factor of the universe to accelerate. The negative pressure which drives the cosmic acceleration is identified with the unusual kinetic energy density of the Planck field. No potential nor cosmological constant is required. This suggests a purely gravity driven, kinetic inflation. Although the possibility is not ruled out, the burst of acceleration is often too weak to address the initial condition problems of cosmology. To illustrate the kinetic acceleration, three different cosmologies are presented. One such example, that of a bouncing universe, demonstrates the additional feature of being nonsingular. The acceleration is also considered in the conformally related Einstein frame in which the Planck mass is constant.

23 pages, LaTex, figures available upon request, (revisions include added references and comment on inflation) CITA-94-18

References in corpus (5)

• The String Dilaton and a Least Coupling Principle
• The Graceful Exit Problem in String Cosmology
• Microwave background anisotropy in low-${\Omega }_0$ inflationary models and the scale of homogeneity in the Universe
• Curvature and Flatness in a Brans-Dicke Universe
• A Possible Solution to the Horizon Problem: The Mad Era for Massless Scalar Theories of Gravity

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