Gravity-Driven Acceleration of the Cosmic Expansion

Details Gravity-Driven Acceleration of the Cosmic Expansion Gravity-Driven Acceleration of the Cosmic Expansion

1994-05-25

arxiv.org/abs/gr-qc/9405061v2

Phys.Rev.D51:462-471,1995

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

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

Scientific paper

10.1103/PhysRevD.51.462

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.

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