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The shape of bouncing universes

Accepted version
Peer-reviewed

Type

Article

Change log

Authors

Barrow, JD 
Ganguly, C 

Abstract

What happens to the most general closed oscillating universes in general relativity? We sketch the development of interest in cyclic universes from the early work of Friedmann and Tolman to modern variations introduced by the presence of a cosmological constant. Then we show what happens in the cyclic evolution of the most general closed anisotropic universes provided by the Mixmaster universe. We show that in the presence of entropy increase its cycles grow in size and age, increasingly approaching flatness. But these cycles also grow increasingly anisotropic at their expansion maxima. If there is a positive cosmological constant, or dark energy, present then these oscillations always end and the last cycle evolves from an anisotropic inflexion point towards a de Sitter future of everlasting expansion.

Description

Keywords

cosmology

Journal Title

International Journal of Modern Physics D

Conference Name

Journal ISSN

0218-2718
1793-6594

Volume Title

26

Publisher

World Scientific