The Ups and Downs of Cyclic Universes

Details The Ups and Downs of Cyclic Universes The Ups and Downs of Cyclic Universes

2007-01-12

arxiv.org/abs/gr-qc/0701070v1

Phys.Rev.D75:043515,2007

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

15 pages, 4 figures

Scientific paper

10.1103/PhysRevD.75.043515

We investigate homogeneous and isotropic oscillating cosmologies with multiple fluid components. Transfer of energy between these fluids is included in order to model the effects of non-equilibrium behavior on closed universes. We find exact solutions which display a range of new behaviors for the expansion scale factor. Detailed examples are studied for the exchange of energy from dust or scalar field into radiation. We show that, contrary to expectation, it is unlikely that such models can offer a physically viable solution to the flatness problem.

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