Exact Superstring Motivated Cosmological Models

Details Exact Superstring Motivated Cosmological Models Exact Superstring Motivated Cosmological Models

1993-08-11

arxiv.org/abs/gr-qc/9308010v1

Class.Quant.Grav.10:2203-2216,1993

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

18 pages (includes 2 uuencoded postscript figures), NZ-CAN-RE-93/2

Scientific paper

10.1088/0264-9381/10/11/005

We present a number of new, exact scalar field cosmologies where the potential consists of two or more exponential terms. Such potentials are motivated by supergravity or superstring models formulated in higher dimensional spacetimes that have been compactified to (3+1)-dimensions. We have found solutions in both curved and flat Robertson Walker spacetimes. These models have a diverse range of properties and often possess several distinct phases, with a smooth transition between ordinary and inflationary expansion. While exponential potentials typically produce powerlaw inflation, we find models where the inflationary period contains eras of both powerlaw and exponential growth.

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