The shape of bouncing universes
International Journal of Modern Physics D
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Barrow, J., & Ganguly, C. (2017). The shape of bouncing universes. International Journal of Modern Physics D, 26 (1743016)https://doi.org/10.1142/S0218271817170167
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.
External DOI: https://doi.org/10.1142/S0218271817170167
This record's URL: https://www.repository.cam.ac.uk/handle/1810/269529